PIC16F676 voltmeter Pinout

manoj soorya · Aug 14, 2017

this is the PCB I already designed to my needs..

manoj soorya · Aug 15, 2017

Please some one help me...

Ian Rogers · Aug 15, 2017

I don't know where you got that code from, but its rubbish...

C:

  for (i=0;i<200;i++)
   {
   __delay_us(1);
   result=Adc_Read(0);
   if (result > resmax) resmax=result;
   if (result < resmin) resmin=result; }
  result=resmax-resmin;

This will yield 0 if the voltage is stable...
Assume 8 bit reading... 200 x (mid voltage, say 2,5v) we get 25400.. So max and min will be the same (ish)..

result = resmax - resmin; or result = 25400-25400... Oh a big fat 0.. so unless you ground your probes before every 200 samples you get zilch..

I compiled it with XC8 and the code works fine...

Change the faulty line to:-

result = resmin + (resmax - resmin) / 2;

Ian Rogers · Aug 15, 2017

Oh!!! Unless of course its AC only You can keep it in.... If the volt meter does AC then a switch on RA3 could swap between the two!!

manoj soorya · Aug 15, 2017

Thank you So Much Sir....

this is the circuit I already made the PCB...

manoj soorya · Aug 15, 2017

Ian Rogers said:
I don't know where you got that code from

I got this circuit from a Russian site... and eassy designing of PCB, I interchange some connection of the IC to the display.

I already made 3 PCB for my own purpose... But it not work. Its my fault.. I need to check the edited schematic first, I know.

I know, You can help me..

Sorry for my poor english...

I hop the help from you and sorry for the rubbish code...

Regarding Manoj Soorya

manoj soorya · Aug 18, 2017

Ian Rogers said:
If the volt meter does AC then a switch on RA3 could swap between the two!!

Yes master, It is used for AC Measuring...

Can you help me please?

Regards Manoj

manoj soorya · Aug 22, 2017

Ian Rogers said:
Sagor has already replied with the answer!! Change the TRIS registers to suit!!

Good evening Ian Rogers...

I try much time..but not work...

can you please help me to complete..?

Regards Manoj

manoj soorya · Aug 22, 2017

I am also trying again and again to change the setting.. but no change in the display... what I do? or I leave from this work?

Its my humble request...

Ian Rogers · Aug 22, 2017

I converted this to XC8... Using the PCB you supplied
Here's the connections:- No resistors on the drawing as they are not needed for simulation, and the display is a 4 way but ho-hum..

Here is the code... It runs on those connections ripped from your PCB picture..

C:

/*  PIC16F676, , 4 MHz
   mikroC PRO for PIC  */
#include<xc.h>
#define _XTAL_FREQ 4000000
#define a 1   //
#define b 2   //
#define c 4   //
#define d 8   //
#define e 16  //
#define f 32  //
#define g 64  //
#define DP 128//
unsigned int i = 1; //
unsigned char Dig[11];
static char Segment[3] = {0x7f,0x7f,0x7f};
static unsigned char ColCount = 0;
unsigned result, resmax, resmin;
unsigned char R_A, R_C;
void io_init()
 {
 TRISA = 0b00001001;
 PORTA = 0b00000100;
 TRISC = 0b00000000;
 PORTC = 0b00001010;
 ADCON0 = 0b00000001;
 ADCON1 = 0b10000101;
 CMCON = 7;}
void Dig_init()
 {
 Dig[0]=0xff-0x3F;
 Dig[1]=0xff-0x06;
 Dig[2]=0xff-0x5B;
 Dig[3]=0xff-0x4F;
 Dig[4]=0xff-0x66;
 Dig[5]=0xff-0x6D;
 Dig[6]=0xff-0x7D;
 Dig[7]=0xff-0x07;
 Dig[8]=0xff-0x7F;
 Dig[9]=0xff-0x6F;
 Dig[10]=0xff-0x00;
 }
void Display()
 {
 R_A = 0;
 R_C = 0;
 __delay_us(2);
 if (ColCount >= 3) ColCount = 0;
 switch (ColCount)
  {
  case 0 : R_A += 4; break;
  case 1 : R_A += 2; break;
  case 2 : R_A += 32;
  }
 if( Segment[ColCount] & 0x01) R_C+= 4; //a
 if( Segment[ColCount] & 0x02) R_C+= 8; //b
 if( Segment[ColCount] & 0x04) R_C+= 16; //c
 if( Segment[ColCount] & 0x08) R_C+= 32; //d
 if( Segment[ColCount] & 0x10) R_A+= 16; //e
 if( Segment[ColCount] & 0x20) R_C+= 2; //f
 if( Segment[ColCount] & 0x40) R_C+= 1; //g               manoj
 PORTA = R_A; PORTC = R_C;
 ColCount++;
 }
void HTO7S(unsigned long int Num)
 {
 Segment[0] = Dig[Num / 100];
 if (Segment[0] == Dig[0]) Segment[0] = Dig[10];
  Segment[1] = Dig[Num % 100 / 10];
 if ((Segment[1] == Dig[0]) && (Segment[0] == Dig[10])) Segment[1] = Dig[10];
  Segment[2] = Dig[Num % 10];
 }
void Init_Timer1 () {
 GIE = 1;
 PEIE = 1;
 T1CON = 0x01;
 TMR1H = 0x00;
 TMR1L = 0x00;
 // T1CON.T1CKPS0 = 1;
 // T1CON.T1CKPS1 = 1;
 TMR1IE = 1;
 }
void interrupt ISR()
 {
 if(TMR1IF)
  {
  TMR1H = 0xF7;
  TMR1IF = 0;
  Display();
  }
 }
int Adc_Read(char channel)
 {
 GO = 1;
 __delay_us(200);
 while(GO);
 return ADRESH ;
 }
void main()
 {
 io_init();
 Dig_init();
 Init_Timer1();
 do
  {
  result=0;
  resmax=0;
  resmin=65535;
  for (i=0;i<200;i++)
   {
   __delay_us(1);
   result=Adc_Read(0);
   if (result > resmax) resmax=result;
   if (result < resmin) resmin=result; }
  result=resmin + (resmax-resmin) /2;
  HTO7S(result / 4);
  __delay_ms(500);
  }while (1);
}

**** REMEMBER *** I changed this for DC measurement... Your original is for AC

manoj soorya · Aug 22, 2017

Thank you for the code Ian Rogers

Ian Rogers said:
**** REMEMBER *** I changed this for DC measurement... Your original is for AC

I need its for measuring AC...

I have DC meter...

Thanks again..

manoj soorya · Aug 22, 2017

Hello Ian Rogers

Ian Rogers said:
Here is the code... It runs on those connections ripped from your PCB picture..

Can you please make the code working I already Given? Its most suitable for the PCB, I made..

I will upload the code and schematic for the same again...

Hope your help again...

Code:

/PIC16F676,  4 MHz
   mikroC PRO for PIC  */


#define a 1   // 
#define b 2   //
#define c 4   //
#define d 8   //
#define e 16  //
#define f 32  //
#define g 64  //
#define DP 128//

unsigned int i = 1; //
unsigned char Dig[11]; //
//
//

static char Segment[3] = {0x7f,0x7f,0x7f};
static unsigned char ColCount = 0; //

unsigned result, resmax, resmin;           //
unsigned char RA, RC; //

void io_init()
   {TRISA = 0b00001001;          //
    PORTA = 0b00000100;
    TRISC = 0b00000000;
    PORTC = 0b00001010;
    ADCON0 = 0b00000001;  //
    ADCON1 = 0b10000101;  // 1110 D D D D D D D A VDD VSS 1/0
    CMCON = 7;}           //

void Dig_init()
   {Dig[0]  = 255-(a+b+c+d+e+f);   //
    Dig[1]  = 255-(b+c);           //
    Dig[2]  = 255-(a+b+g+e+d);     //
    Dig[3]  = 255-(a+b+g+c+d);     //
    Dig[4]  = 255-(f+g+b+c);       ///
    Dig[5]  = 255-(a+f+g+c+d);     //
    Dig[6]  = 255-(a+f+g+c+d+e);   //
    Dig[7]  = 255-(a+b+c);         // Dig[7]  = 255-(a+b+c);
    Dig[8]  = 255-(a+b+c+d+e+f+g);
    Dig[9]  = 255-(a+b+c+d+f+g);
    Dig[10] = 255-0;}

void Display() {
    RA = 0b00000000;    //  RA2, RC1, RC3 = 0
    RC = 0b00000000;    // Âñå ñòîëáöû K ðàâíû 1 Âñå ñåãìåíòû (a - h) ðàâíû 0
    delay_Cyc(2);
    if (ColCount >= 3) ColCount = 0; //

    switch (ColCount) {
        case 0 : RA.f2 = 1; break; // Âûáîð èíäèêàòîðà K1
        case 1 : RC.f1 = 1; break; // Âûáîð èíäèêàòîðà K2
        case 2 : RC.f3 = 1; }      // Âûáîð èíäèêàòîðà K3

    RC.f0 = Segment[ColCount].f0;  //a
    RC.f2 = Segment[ColCount].f1;  //b
    RA.f4 = Segment[ColCount].f2;  //c
    RA.f1 = Segment[ColCount].f3;  //d
    RA.f5 = Segment[ColCount].f4;  //e
    RC.f4 = Segment[ColCount].f5;  //f
    RC.f5 = Segment[ColCount].f6;  //g

    PORTA = RA; PORTC = RC;
    ColCount++; }

void HTO7S(unsigned long int Num)  {  // Ïðåîáðàçîâàíèå â 7-è ñåãìåíòíûé êîä
    Segment[0] = Dig[Num / 100];
    if (Segment[0] == Dig[0]) Segment[0] = Dig[10];

    Segment[1] = Dig[Num % 100 / 10];
    if ((Segment[1] == Dig[0]) && (Segment[0] == Dig[10])) Segment[1] = Dig[10];

    Segment[2] = Dig[Num % 10];}

void Init_Timer1 () { //Èñïîëüçóåòñÿ ìîäóëü Timer1
    INTCON.GIE = 1;
    INTCON.PEIE = 1;
    T1CON = 0x01;
    TMR1H = 0x00;
    TMR1L = 0x00;
    // T1CON.T1CKPS0 = 1;  // Äåëèòåëü íà 2    Äëÿ Proteus
    // T1CON.T1CKPS1 = 1;  // Äåëèòåëü íà 4    Äëÿ Proteus
    PIE1.TMR1IE = 1;}    // Ðàçðåøåíèå ïðåðûâàíèÿ ïî ïåðåïîëíåíèþ TMR1

void interrupt () {
    if (PIR1.TMR1IF)    // Îáðàáîò÷èê ïðåðûâàíèÿ ïðè ïåðåïîëíåíèè TMR1
        {TMR1H = 0xF7;   // Ïåðèîä 6,2 ìñåê
        PIR1.TMR1IF = 0;
        Display();}}

void main() {   // Ïðÿìîå èçìåðåíèå ïåðåìåííîãî íàïðÿæåíèÿ
    io_init();
    Dig_init();
    Init_Timer1();
    do {result=0;
        resmax=0;
        resmin=65535;
        for (i=0;i<200;i++) {
            delay_us(1);
            result=Adc_Read(0);
            if (result > resmax) resmax=result;
            if (result < resmin) resmin=result; }
        result=resmax-resmin;
        HTO7S(result / 4); // Äî 255 âîëüò
        delay_ms(500);}
    while (1);  // Áåñêîíå÷íûé öèêë
}

[CODE]

I delete some unreadable cahractor, thats in another language...

Ian Rogers · Aug 22, 2017

Oh Yeah!! Why don't I go all out and install MikroE for pic just to get you going!!! Do you not think I would have done that rather than spend over 2 hours converting to a better compiler just for someone else in another corner of the world!!!

Tell you what!! Why don't I reprint your PCB's for free!!!

I made that code work for your PCB.... I don't know why I bothered....

manoj soorya · Aug 22, 2017

Its okey Ian Rogers...

Please be cool...

Its okey.....

I can made the PCB for your code...

Thank you so much.... I really appriciate your hardwork for me...

Thanks again...

Ian Rogers said:
I made that code work for your PCB.... I don't know why I bothered....

Thats only a true Admin can done for his friends..

PIC16F676 voltmeter Pinout

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