READING A PUSHBUTTON & display on LCD

AtomSoft · Sep 18, 2009

Try this as your usermenu stuff. The slow speed might be because of that 2 second delay you have in the menu using timer1:

Code:

void userMenu(char pos){
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= 2000000)		// if reached 2 seconds!
	 			{
    				bres -= 2000000;	// subtract 2 seconds, keep error
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

					lcd_goto_L2();				//Only change line 2
					lcd_data(cm10 + '0');
					lcd_data(cm + '0');
	    			lcd_puts(" [cm] ");			//comment this out if you want
			   } 
		}
		lcd_goto_L1();
		lcd_puts("      OK      ");
		lcd_goto_L2();
		lcd_puts("              ");
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

Holding Home down will take you home.

EDIT: If you can read this try the code again. I edited it/

AtomSoft · Sep 18, 2009

Ok ok i forgot a few things. try this full code:

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char cmHigh, cmLow;

      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations

unsigned int LiquidLevel;
unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= 2000000)		// if reached 2 seconds!
	 			{
    				bres -= 2000000;	// subtract 2 seconds, keep error
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

					lcd_goto_L2();				//Only change line 2
					lcd_data(cm10 + '0');
					lcd_data(cm + '0');
	    			lcd_puts(" [cm] ");			//comment this out if you want
			   } 
		}
		lcd_goto_L1();
		lcd_puts("      OK      ");
		lcd_goto_L2();
		lcd_puts("              ");
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}
// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// [b]used for voltage calculations backup[/b]
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//[b]Create a copy of math for more use[/b]
	mathKeep = math;
    //LiquidLevel=height-;	

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//[b]Now our original data is back and can be used.[/b]
}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen
/*
"enter height"
call enter/settings (which is now user input function in new code)
height=MyVal

"enter range"
call user_input
range=MyVal

"enter surface area"
call user_input
area=MyVal
*/
}
  
//*********************************************************
/*  Junebug_Serial4.c    RomanBlack.com 19th July 2009.

    uses "zero error 1 second timer"
	system to generate a 2 second interval, then every
	2 seconds it reads an analog voltage from a
	Sharp GP2 distance sensor and converts it to decimal
	distance, then sends that data to a LCD

	Code for MikroC, config handled by MikroC compiler;
	_INTI02_OSC_1H
	_WDT_OFF_2H
	-MCLRE_ON_3H
	_LVP_OFF_4L 
	_PWRT_ON_2L
*/
//*********************************************************

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();

 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
             
 
   } 
}

AtomSoft · Sep 18, 2009

This code checks 4 times a second

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char cmHigh, cmLow;

      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations

unsigned int LiquidLevel;
unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= 250000)		// if reached 2 seconds!
	 			{
    				bres -= 250000;	// subtract 2 seconds, keep error
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

					lcd_goto_L2();				//Only change line 2
					lcd_data(cm10 + '0');
					lcd_data(cm + '0');
	    			lcd_puts(" [cm] ");			//comment this out if you want
			   } 
		}
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}
// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// [b]used for voltage calculations backup[/b]
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//[b]Create a copy of math for more use[/b]
	mathKeep = math;
    //LiquidLevel=height-;	

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//[b]Now our original data is back and can be used.[/b]
}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen
/*
"enter height"
call enter/settings (which is now user input function in new code)
height=MyVal

"enter range"
call user_input
range=MyVal

"enter surface area"
call user_input
area=MyVal
*/
}
  
//*********************************************************
/*  Junebug_Serial4.c    RomanBlack.com 19th July 2009.

    uses "zero error 1 second timer"
	system to generate a 2 second interval, then every
	2 seconds it reads an analog voltage from a
	Sharp GP2 distance sensor and converts it to decimal
	distance, then sends that data to a LCD

	Code for MikroC, config handled by MikroC compiler;
	_INTI02_OSC_1H
	_WDT_OFF_2H
	-MCLRE_ON_3H
	_LVP_OFF_4L 
	_PWRT_ON_2L
*/
//*********************************************************

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();

 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
             
 
   } 
}

fantabulous68 · Sep 18, 2009

lol OK Super Cool

That fixes the get to home screen problem hehehe but it comes with a price.....

the sensors reading slow.....

fantabulous68 · Sep 18, 2009

Loading Home

It got a bit faster.....R u changing the oscillator frequency???

fantabulous68 · Sep 18, 2009

It needs to be pretty fast to detect the changes in the level of the liquid

MATHKEEP

Ok thats a better solution by far...lol dont know why my thinking is so complicated hehehe maybe coz im a gal

fantabulous68 · Sep 18, 2009

Thanks AtomSoft....You helped solve alot of problems

fantabulous68 · Sep 18, 2009

Code:

unsigned char LLHigh, LLLow;
unsigned int LiquidLevel;

Code:

void calc_distance(void)
{
unsigned int mathKeep;		// used for voltage calculations backup
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//Create a copy of math for more use
	mathKeep = math;
   

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//Now our original data is back and can be used.
	[COLOR="Plum"]do i need to say height=user_input???[/COLOR]
      [COLOR="Red"]LiquidLevel=height-math;	
      //LiquidLevel is higher than 09 so spilt the variable LiquidLevel into 2 //
      LLHigh = ( LiquidLevel / 10 ) + '0'; // 
      LLLow = ( LiquidLevel % 10 ) + '0';  // [/COLOR]
      





}

fantabulous68 · Sep 18, 2009

LOL it workzzzzzzzzzzzzzzzzzzzzzzzz!!!!!!

it displays the height-liquid level

fantabulous68 · Sep 18, 2009

I only made the changes in RED highlight..................
I entered the height as 70cm
i put a paper 10cm away from the sensor...

& it says measured 60cm

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char LLHigh, LLLow;

      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations

unsigned int LiquidLevel;
unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= 250000)		// if reached 2 seconds!
	 			{
    				bres -= 250000;	// subtract 2 seconds, keep error
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance
[COLOR="Red"][B]
				    lcd_goto_L2();				//Only change line 2
					lcd_data(LLHigh + '0');
					lcd_data(LLLow + '0');
	    			lcd_puts(" [cm] ");			//comment this out if you want[/B][/COLOR]
			   } 
		}
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}
// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// used for voltage calculations backup
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//Create a copy of math for more use
	mathKeep = math;
   

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//Now our original data is back and can be used.
    
	[B][COLOR="Red"]LiquidLevel=height-math;	
	//LiquidLevel is higher than 09 so spilt the variable LiquidLevel into 2 //
      LLHigh = ( LiquidLevel / 10 ) + '0'; // 
      LLLow = ( LiquidLevel % 10 ) + '0';  // [/COLOR][/B]
      





}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen

} 

  

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();
	
 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
              
 
   } 
}

Hehe...just applying YOUR tricks there AtomSoft......................................

Fast learner lol i hope i am...........THANX THANX THANX AtomSoft 4 President!!!

Uhmmmmm but i still got to work on speeding it up.....(i am goin to do that now)

fantabulous68 · Sep 18, 2009

OMG!!!! i dont know what happened now.....i reloaded the exact code from above(the one i made changes to...the one that was working) but!!!

the measured "values" are ALPHABETS!!!!

now

fantabulous68 · Sep 18, 2009

Ok there it is..... Shew!!!!working again BUT i noticed that.....it does still display measurements as ALPHABETS but this happens in acertain case.....:

CASE 1[negative case]
Eg if height=30
distance away from sensor=40
liquid level will thus be=-10 BUT we dont have negative distances....
*(uhmmmm i declared LiquidLevel as unsigned int)

AND thats when it displays all funny kind alien like wingding symbols hehehe...

CASE 2 [positive case]
But if height=30
distance away from sensor=10
lcd displays measuerd distance=20cm

So basically the negative case(liquid level is higher than the container-maybe an overflow) is like an impossible situation in which case it would be appropriate to display a suitable message if the distance is negative???

Uhmmm but also i should consider displaying a message if the container is full
ie. container height=liquid level

Well i want to know what can i do to prevent those funny symbols from appearing????

& how can i speed up the sensor....i tried in vein hehe

ADCON2 = 0b10100010; // right justify, 8Tad, 32Tosc would increasing the32Tosc help?
O the speed all deals with the timer?

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char LLHigh, LLLow;
unsigned int LiquidLevel;


      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations


unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= 250000)		// if reached 2 seconds!
	 			{
    				bres -= 250000;	// subtract 2 seconds, keep error
		  	
	 				// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

				    lcd_goto_L2();				//Only change line 2
				    lcd_data(LLHigh);
    		 	    lcd_data(LLLow);
	    			lcd_puts(" [cm] ");			//comment this out if you want

			   } 
		}
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}
// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// used for voltage calculations backup
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//Create a copy of math for more use
	mathKeep = math;
    //LiquidLevel=height-;	

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//Now our original data is back and can be used.
	LiquidLevel=height-math;	

      //LiquidLevel is higher than 09 so spilt the variable LiquidLevel into 2 //
      LLHigh = ( LiquidLevel / 10 ) + '0'; // 
      LLLow = ( LiquidLevel % 10 ) + '0';  // 
      


}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen
/*
"enter height"
call enter/settings (which is now user input function in new code)
height=MyVal

"enter range"
call user_input
range=MyVal

"enter surface area"
call user_input
area=MyVal
*/
}
  
//*********************************************************
/*  Junebug_Serial4.c    RomanBlack.com 19th July 2009.

    uses "zero error 1 second timer"
	system to generate a 2 second interval, then every
	2 seconds it reads an analog voltage from a
	Sharp GP2 distance sensor and converts it to decimal
	distance, then sends that data to a LCD

	Code for MikroC, config handled by MikroC compiler;
	_INTI02_OSC_1H
	_WDT_OFF_2H
	-MCLRE_ON_3H
	_LVP_OFF_4L 
	_PWRT_ON_2L
*/
//*********************************************************

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();

 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
             
 
   } 
}

AtomSoft · Sep 18, 2009

no

if you take out that delay or make it less then its faster:

Code:

void userMenu(char pos){
    unsigned int delaytime = 100000; // 100ms [COLOR=RED][b]CHANGE THIS FOR YOUR BELOW DELAY[/b] [/COLOR]
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value[b][COLOR="Red"]
				if(bres >= delaytime )		// if reached 2 seconds!
	 			{
    				bres -= delaytime ;	// subtract 2 seconds, keep error [/COLOR][/b]
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

					lcd_goto_L2();				//Only change line 2
					lcd_data(cm10 + '0');
					lcd_data(cm + '0');
	    			lcd_puts(" [cm] ");			//comment this out if you want
			   } 
		}
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

AtomSoft · Sep 18, 2009

sorry im not a negative number person

not sure how to allow it... just got back from work. Ill take a look in a minute

fantabulous68 · Sep 18, 2009

Yeah thats cool

Maybe i should say something like :

1)if liquid level<0 [ie. negative]
[this would happen for an over flow ie .when the level of the liquid is > height of container]
then--> lcd display "ERROR"

in this way it would prevent funny symbols from being displayed...........
AND all negative distances will be represented by "error"

2)if liquid level=height then--> lcd display "FULL"

3)if liqud level level=00 then--> lcd display "EMPTY"

so these 3 cases cater for all 3 scenarios that can take place.....
sounds good???

fantabulous68 · Sep 18, 2009

The speed is much much better now-

only changed the part in RED.....hope im displaying it correctly to LCD. The alien wingdings appear when the level is negative otherwise it displays positive values correctly

Code:

[COLOR="Red"][B]	lcd_goto_L2();				//Only change line 2
					lcd_data(LLHigh);
					lcd_data(LLLow);
	    			lcd_puts(" [cm] ");			//comment this [/B][/COLOR]out if you want

here the code with the red highlight included:

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char LLHigh, LLLow;
unsigned int LiquidLevel;


      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations


unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
    unsigned int delaytime = 100000; // 100ms CHANGE THIS FOR YOUR BELOW DELAY 
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= delaytime )		// if reached 2 seconds!
	 			{
    				bres -= delaytime ;	// subtract 2 seconds, keep error 
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

				[COLOR="Red"][B]	lcd_goto_L2();				//Only change line 2
					lcd_data(LLHigh);
					lcd_data(LLLow);
	    			lcd_puts(" [cm] ");			//comment this [/B][/COLOR]out if you want
			   } 
		} 
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// used for voltage calculations backup
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//Create a copy of math for more use
	mathKeep = math;
    //LiquidLevel=height-;	

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//Now our original data is back and can be used.
	LiquidLevel=height-math;	

      //LiquidLevel is higher than 09 so spilt the variable LiquidLevel into 2 //
      LLHigh = ( LiquidLevel / 10 ) + '0'; // 
      LLLow = ( LiquidLevel % 10 ) + '0';  // 
      


}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen
/*
"enter height"
call enter/settings (which is now user input function in new code)
height=MyVal

"enter range"
call user_input
range=MyVal

"enter surface area"
call user_input
area=MyVal
*/
}
  
//*********************************************************
/*  Junebug_Serial4.c    RomanBlack.com 19th July 2009.

    uses "zero error 1 second timer"
	system to generate a 2 second interval, then every
	2 seconds it reads an analog voltage from a
	Sharp GP2 distance sensor and converts it to decimal
	distance, then sends that data to a LCD

	Code for MikroC, config handled by MikroC compiler;
	_INTI02_OSC_1H
	_WDT_OFF_2H
	-MCLRE_ON_3H
	_LVP_OFF_4L 
	_PWRT_ON_2L
*/
//*********************************************************

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();

 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
             
 
   } 
}

I didnt use this below to display

Code:

lcd_data(LLHigh + '0');
	//	lcd_data(LLLow + '0');

because the LCD displays ALPHABET measurements

EG

Measured

ae

AtomSoft · Sep 18, 2009

Try this it will show 00cm if its a Negative:

Code:

#include <pic.h>
#include "pic.h"
#include "delay.h"
#include "math.h" 
#include <stdio.h>
#include <stdlib.h>	//

void userMenu(char pos); //  
void FloatToStr(float , char[]); 
void DelayMs(unsigned char);
void lcd_cmd(unsigned char);
void lcd_data(unsigned char); 
void lcd_clear(void);
void lcd_puts(const char[]);
void lcd_goto_L1(void);
void lcd_goto_L2(void);
void lcd_cursor(unsigned char);
void lcd_init(void);
void init(void);
char WaitForInput(char expire);  
unsigned char user_input(void);
void home_screen(void);
void EnterHeight(void);
void EnterScreen(void);
void ShowDigits(unsigned char val);
void calc_distance(void);
void main(void);


unsigned char cm2LCD;

unsigned char LLHigh, LLLow;
unsigned int LiquidLevel;


      

#define LCD_RS RC0		//LCD RS pin
#define LCD_EN RC1		//LCD EN pin
#define LCD_STROBE()	LCD_EN = 1; asm("nop"); asm("nop"); LCD_EN = 0

unsigned char cm10;		//
unsigned char cm;		//
unsigned int math;		// used for voltage calculations


unsigned char NumDec;
unsigned char NumSep[2];
   
unsigned char i,j,k;
//char temp[8];
//[/b]
unsigned char height=50;
unsigned char range;
unsigned char area;
unsigned char SensorPos=10;
//[/b] New Vars
char input_sw;

  
char mnuPOS;

unsigned char MyVal;
unsigned char MyValLCD[2];
unsigned char MyMaxVal;
unsigned char MyMinVal;
unsigned long bres;		// for bresenham 2-second timer system

unsigned char ;

#define HOME_SW RC2				//HOME switch	
#define INCREASE_SW RC3			//INCREASE switch
#define DECREASE_SW RC4			//DECREASE switch
#define ENTERSETTINGS_SW RA4	//ENTERSETTINGS switch



///////////////////////CONVERT FLOAT TO STRING///////////////////
// This function was taken from the CAVR library. It was modified slightly
// to suit our design.
void FloatToStr(float n, char str[])
{
float scale;
unsigned char d,f;
f=0;i=0;
if (n<0.0) {n=-n; str[f]='-'; f++;}; 
n=n+0.005;
scale=1.0;
while (n>=scale) {scale=scale*10.0; ++i;};
if (i==0) {str[f]='0'; f++;}
else
while (i--)
	  {
      scale=floor(0.5+scale/10.0);
      d=(unsigned char) (n/scale);
      str[f]=d+'0';
      n=n-scale*d;
	  f++;
      };

str[f]='.';
f++;
for (j=0;j<=1;j++) //2 decimal points
      {
      n=n*10.0;
      d=(unsigned char) n;
      str[f]=d+'0';
      n=n-d;
	  f++;
	  };
str[f]='\0';
}
///////////////////END CONVERT FLOAT TO STRING///////////////////

/////////////////////////////DELAY///////////////////////////////
void DelayMs(unsigned char cnt)
{
#if	XTAL_FREQ <= 2MHZ
	do {
		DelayUs(996);
	} while(--cnt);
#endif

#if    XTAL_FREQ > 2MHZ	
	unsigned char	p;
	do {
		p = 4;
		do { 
			DelayUs(250);
		} while(--p);  
	} while(--cnt);
#endif
}

void DelayS(unsigned char cnt)
{
	for (j=0; j<(cnt*10); j++)
		DelayMs(100);
}
///////////////////////////DELAY END/////////////////////////////

//////////////////////////////LCD SETUP//////////////////////////
/* send a command to the LCD */
void lcd_cmd(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	LCD_RS = 0;	 //write instruction
	PORTB = (c & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD
	PORTB = ((c << 4) & 0xF0); //load upper nibble on LCD data lines
	LCD_STROBE(); //send instruction to LCD   	
}

/* send data to the LCD */
void lcd_data(unsigned char c)
{
	DelayMs(2); //wait for LCD to be ready shorter delay 
	PORTB = 0x00;
	LCD_RS = 1; //write data
    PORTB |= (c & 0xF0); //load upper nibble on LCD data lines     
	LCD_STROBE(); //send instruction to LCD
	PORTB &= 0x00; //load upper nibble on LCD data lines
	PORTB |= ( (c << 4) & 0xF0); 
	LCD_STROBE(); //send instruction to LCD
}

/*Clear the LCD*/
void lcd_clear(void)
{
	lcd_cmd(0x01); //command to clear LCD
}

/*write a string of chars to the LCD*/
void lcd_puts(const char s[])
{
	j = -1;
	while(s[++j]!=('\0')) // send characters until null character reached
		lcd_data(s[j]);
}

/*go to beginning of line 1*/
void lcd_goto_L1(void)
{
	lcd_cmd(0b10000000); // command to go to line 1
}

/*go to beginning of line 2*/
void lcd_goto_L2(void)
{
	lcd_cmd(0b11000000); // command to go to line 2
}

/*move cursor "x" positions to the right*/
void lcd_cursor(unsigned char x)
{
	lcd_cmd(((x)&0x7F)|0x80); 
}

/*initialise the LCD - put into 4 bit mode*/
void lcd_init(void)
{
	LCD_RS = 0;	
	LCD_EN = 0;
	DelayMs(20); //wait for LCD startup
	lcd_cmd(0x02);
 
	lcd_cmd(0x28);	// 4-bit mode
	lcd_cmd(0x08);	// display off
	lcd_cmd(0x01);	// clear display
	lcd_cmd(0x0C);	// disp. on, cursor off, cursor blink off
	lcd_cmd(0x06);	// entry mode
	lcd_cmd(0x80);  // initialise DDRAM address to zero
}
//////////////////////////LCD SETUP END//////////////////////////
    

void init(void)
{   
	
	// setup the PIC 16f690
	OSCCON = 0x72;      	// internal osc, 8MHz


	PORTA = 0;
	TRISA = 0b10010010; 	// RA7 high imp, RA3 is serial out, RA4 button input 


	
 	PORTB = 0;          	// PORTB not used
    WPUB = 1;				// PORTB pullups ON		
    RABPU = 0;


    /* Init ADC */
    ADCON0 = 0b10000101;	// bit 7 right justify,analogue channel select bits bits5-2  0001=AN1,ADC ON, RA1 is ADC input
	ADCON1 = 0b00100000;	//bits6-4  fosc/32
    ADON=1;	                // turn on the A2D conversion module

	
	ANSEL=0x02;            //set RA1 as analog input for GP2 sensor
	ANSELH=0x00;

    T1CON = 0b00010001;     // TMR1 is ON, 1:2 prescale, =1MHz
	T2CON = 0b00000101;     // TMR2 is ON, 1:4 prescale, =1MHz



	MyVal = 0; //initializn these variables here
	MyMinVal = 0;
	MyMaxVal = 99;
  
	TRISB=0x00; 
	TRISC=0xFC;
    
	lcd_init(); //call LCD initialisation

}
//EDITED this a bit. now if expire input is set it will leave loop with a 0
//instead of rechecking this will be useful for display your measured data and 
//waiting for user to exit.
char WaitForInput(char expire){
char done;
char temp;
done = 0;
temp = 0;
while(!done){
    if(!ENTERSETTINGS_SW){
		while(ENTERSETTINGS_SW);
        temp = 1;
        done = 0xff;
    }

    if(!HOME_SW){
		while(HOME_SW);
        temp = 2;
        done = 0xff;
    }

    if(!INCREASE_SW){
		while(INCREASE_SW);
        temp = 3;
        done = 0xff;
    }

    if(!DECREASE_SW){
		while(DECREASE_SW);
        temp = 4;
        done = 0xff;
    }
	if(expire == 1) break;
}//end of while
    DelayMs(150);    //debounce
    return temp;
}//
void userMenu(char pos){
    unsigned int delaytime = 100000; // 100ms CHANGE THIS FOR YOUR BELOW DELAY 
	lcd_clear();
	lcd_goto_L1();

	switch(pos){
		case 0:
			lcd_puts("    HEIGHT    ");
			break;		
		case 1:
			lcd_puts("    RANGE     ");
			break;		
		case 2:
			lcd_puts(" SURFACE AREA ");
			break;							//
		case 3: 
			lcd_puts("   MEASURED   ");
			 while(WaitForInput(1) != 2){		//Wait for user to press enter to leave loop

 				// wait for 2 seconds, uses TMR1 free running at 1Mhz
   				while(!TMR1IF)  		// wait for TMR1 overflow
				TMR1IF = 0; 			// clear overflow flag

				bres += 65536;			// add 65536uS to bres value
				if(bres >= delaytime )		// if reached 2 seconds!
	 			{
    				bres -= delaytime ;	// subtract 2 seconds, keep error 
		  	
					// read the ADC voltage RA1 (Sharp GP2 sensor)
					GODONE=1;					// initiate conversion on the channel 0
					while(GODONE) continue;  	// Wait convertion done
					calc_distance();			// convert ADC value to distance

					lcd_goto_L2();				//Only change line 2
					lcd_data(LLHigh);
					lcd_data(LLLow);
	    			lcd_puts(" [cm] ");			//comment this out if you want
			   } 
		} 
		lcd_goto_L1();
		lcd_puts(" Loading Home ");
		lcd_goto_L2();
		lcd_puts("              ");
		DelayS(1);
		break;
	}

	if(pos == 3) return;
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

// New Menu System
void EnterHeight(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" ENTER HEIGHT ");
	lcd_goto_L2();
	lcd_puts("Press Up/Down"); //home screen message (line 2)
}

void EnterScreen(void){
	lcd_clear();
	lcd_goto_L1();
	lcd_puts(" [cm] ");
}

void ShowDigits(unsigned char val){

    MyValLCD[0] = val /10;    //returns the quotient (if temp = 35 the result is 3)
    MyValLCD[1] = val % 10; 	//Returns remainder   (if temp = 35 the result is 5)

	MyValLCD[0] += 0x30;	//to ASCII
	MyValLCD[1] += 0x30;	//to ASCII

	EnterScreen();
	lcd_goto_L2();
	lcd_data(MyValLCD[0]);	//to LCD
	lcd_data(MyValLCD[1]);  //to LCD
}

  
void calc_distance(void)
{
unsigned int mathKeep;		// used for voltage calculations backup
	// from the transeiver datasheet the analog voltage is
	// the inverse of distance, so distance can be calculated
	// d = (1 / volts) then just scaled to suit the transeiver

	// load ADC value in 16bit math var
	math = ADRESH;
	math = (math * 256);
	math += ADRESL;

	// now invert it; (1 / volts) use (6050 / volts) for scaling
	math = (6050 / math);
	if(math >= 2) math -=2;		// fix linear error (-2)
	if(math > 99) math = 99;	// max limit at 99cm

	//Create a copy of math for more use
	mathKeep = math;
    //LiquidLevel=height-;	

	// convert from 0-99 to 2 decimal digits, 0-99cm
	cm10=0;
	while(math >= 10)
	{
		cm10++;
		math -= 10;
	}
	cm = math;

	math = mathKeep;	//Now our original data is back and can be used.
	[b][color=red]//This will check if negative
	LiquidLevel=height-math;	
        if((LiquidLevel < 0) || (LiquidLevel > 0xFFB0))
		LiquidLevel = 0;
	//if below zero which will be in the 0xFFFF range i just chose any 0xFFxx number :D[/color][/b]
      //LiquidLevel is higher than 09 so spilt the variable LiquidLevel into 2 //
      LLHigh = ( LiquidLevel / 10 ) + '0'; // 
      LLLow = ( LiquidLevel % 10 ) + '0';  // 
      


}
 //
unsigned char user_input(void)		//This will return what we want
{
	char done = 0;
 
	MyVal = 0;			//Start on 0
	while(done == 0){
   	  input_sw = WaitForInput(0);
		
      switch(input_sw){
		case 1:
			done = 0xff; 			//This tells us the user finished entering
			lcd_goto_L1();
			lcd_puts("      OK       "); //home screen message (line 1)
			break;
      	case 3:
			if(MyVal < MyMaxVal)
      			MyVal++;
			EnterScreen();
			ShowDigits(MyVal);
			break;
      	case 4:
			if(MyVal > MyMinVal)
      			MyVal--;
			EnterScreen();
			ShowDigits(MyVal);
        	break;
		default: 
			break;
      }
	  
	}
	DelayMs(250);
	DelayMs(250);
	return MyVal;
}

void home_screen(void){
	mnuPOS = 0;
	lcd_clear();
	lcd_goto_L1();
	lcd_puts("INFRARED LIQUID"); //home screen message (line 1)
	lcd_goto_L2();
	lcd_puts("LEVEL DETECTOR"); //home screen message (line 2)
  
	input_sw = 0;			//Reset the value

	while(input_sw != 1)  	//Wait until enter is pressed
		input_sw = WaitForInput(0);

	userMenu(0);
	DelayMs(2);				//shorter delay 
    height = user_input();	//The HEIGHT var will have the myVal

	userMenu(1);
	DelayMs(2);				//shorter delay 
    range = user_input();	//The HEIGHT var will have the myVal

	userMenu(2);
	DelayMs(2);				//shorter delay 
    area = user_input();	//The HEIGHT var will have the myVal
//
	userMenu(3);
	DelayMs(2);				//shorter delay 
	input_sw = 0;			//Reset the value

//Waits for user to press ENTER to show home screen
/*
"enter height"
call enter/settings (which is now user input function in new code)
height=MyVal

"enter range"
call user_input
range=MyVal

"enter surface area"
call user_input
area=MyVal
*/
}
  
//*********************************************************
/*  Junebug_Serial4.c    RomanBlack.com 19th July 2009.

    uses "zero error 1 second timer"
	system to generate a 2 second interval, then every
	2 seconds it reads an analog voltage from a
	Sharp GP2 distance sensor and converts it to decimal
	distance, then sends that data to a LCD

	Code for MikroC, config handled by MikroC compiler;
	_INTI02_OSC_1H
	_WDT_OFF_2H
	-MCLRE_ON_3H
	_LVP_OFF_4L 
	_PWRT_ON_2L
*/
//*********************************************************

void main(void)
{  
    init();	// initialise I/O ports, LCD
    while(1){
 	home_screen();

 /*// wait for 2 seconds, uses TMR1 free running at 1Mhz
   	while(!TMR1IF)  // wait for TMR1 overflow
	TMR1IF = 0; 	// clear overflow flag

	bres += 65536;			// add 65536uS to bres value
	if(bres >= 2000000)		// if reached 2 seconds!
	 {
    	bres -= 2000000;	// subtract 2 seconds, keep error
		  	
		// read the ADC voltage RA1 (Sharp GP2 sensor)
		GODONE=1;	// initiate conversion on the channel 0
		while(GODONE) continue;  // Wait convertion done
		calc_distance();		// convert ADC value to distance
	//	LiquidLevel=height-;
	//	lcd_clear();                // Using the new menu you can erase or
	//	lcd_data(cm10 + '0');
	//	lcd_data(cm + '0');
	 //   lcd_goto_L2(); 
	   // lcd_puts("[cm] ");			//comment this out if you want
*/
 
      
        
             
 
   } 
}

Pommie · Sep 18, 2009

The usual way to handle negative numbers is by doing something like,

Code:

    if(value<0){        //if negative
        value=-value;   //negate it
        LcdPut('-')     //print minus character
    }else{              //if positive
        LcdPut(' ')     //print space to keep allignment
    }

As you are doing the calcs in a function, you could set a flag in you code when you negate it.

Mike.

fantabulous68 · Sep 19, 2009

ok i will try the code....Thanx AtomSoft....

Tried it & it works

....

*i will also write some code for calculating the volume of the liquid in the container....
surface area X level of liquid

Now later today im going to test this "IR LLD" on LIQUIDS

How exciting lol....................I hope it works accurately.....

For now im going to start learning for my exams

ericgibbs · Sep 19, 2009

fantabulous68 said:
ok i will try the code....Thanx Atom....

bt i think it should only display 00cm when its empty

i think "error/overflow" is more suitable for the negative case

Morning Miss f,

IMO 'error/overflow' is misleading, sounds as though the 'tank' is over full.

Pommie's method is often used to indicate less than zero values.

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