Hello people,
After I set up the LCD temperature display, I want to show temperature on the digits (7 segments) in this method (00,0C) with 0,1 degree Celsius rezolution . I am using the MCU P16F628A, temperature sensor DS18B20 and 4 digit (7 segment) with common cathode.
Language used is MikroC.
Now, I have made some research and I create this code:
If i force to a specific value, that value is displayed on digits, but also have to do this line commented: //value = ((J1*10) + J2);
At this moment all four digits varies between 0000 and 0260. I think the issue begin when transform in decimal value.
Does anyone have any idea to fix this problem?
Kind Regards,
ducu
After I set up the LCD temperature display, I want to show temperature on the digits (7 segments) in this method (00,0C) with 0,1 degree Celsius rezolution . I am using the MCU P16F628A, temperature sensor DS18B20 and 4 digit (7 segment) with common cathode.
Language used is MikroC.
Now, I have made some research and I create this code:
Code:
/*
'*******************************************************************************
' Description:
' The temperature most be displayed on the digits (7 segments) in this
' method (00,0C) with 0,1degree C resolution.
' Test configuration:
' MCU: PIC16F628A
' Configuration Word
' Oscillator: INTOSC:I/O on RA.6, I/O on RA.7
' Watchdog Timer: OFF
' Power up Timer: Disabled
' Master Clear Enable: Enabled
' Browun Out Detect: Enabled
' Low Voltage Program: Disabled
' Data EE Read Protect: Disabled
' Code Protect: OFF
'*******************************************************************************
*/
//***********Declared mask*************/
unsigned short mask(unsigned short num){
switch (num) {
case 0 : return 0x3F;
case 1 : return 0x06;
case 2 : return 0x5B;
case 3 : return 0x4F;
case 4 : return 0x66;
case 5 : return 0x6D;
case 6 : return 0x7D;
case 7 : return 0x07;
case 8 : return 0x7F;
case 9 : return 0x6F;
}
}
/*******Endless mask***********/
unsigned short shifter, portb_index;
unsigned short portb_array[4];
unsigned char digit, J1, J2, J3;
unsigned int value;
unsigned CC;
void interrupt_routine() org 0x04
{
PORTA = 0; // Turn off all 7seg. displays;
PORTB = portb_array[portb_index]; // Bring appropriate value to PORTB;
PORTA = shifter; // Turn on appropriate 7seg. display;
//move shifter to next digit;
shifter <<= 1;
if(shifter > 8u)
shifter = 1;
// Increment portb_index;
portb_index ++ ;
if (portb_index > 3u)
portb_index = 0; // Turn on 1st, turn off 2nd 7 seg.;
TMR0 = 0; // Reset TIMER0 value;
INTCON = 0x20; // Clear T0IF, Bit T0IF=0, T0IE=1;
}
void sensor(){
INTCON.GIE = 0; // Disable interrupt;
Ow_Reset (PORTA, 4); // One wire reset signal;
Ow_Write (PORTA, 4, 0xCC); // Issue command to DS18B20;
Ow_Write (PORTA, 4, 0X44); // Issue command to DS18B20;
INTCON.GIE = 1; // Enable interrupt;
Delay_ms(700); // Wait for conversion complete;
// If this delay is less than 500ms, you
// Will see the first reading on LCD, 85'C
// Which is a power on reset value.
INTCON.GIE = 0;
CC = Ow_Reset(PORTA ,4);
Ow_Write(PORTA, 4, 0XCC); // Issue command to DS18B20;
Ow_Write(PORTA, 4, 0XBE); // Issue command to DS18B20;
J1 = Ow_Read(PORTA ,4); // Get result;
J2 = Ow_Read(PORTA ,4); // Get result (assuming the temperature is positive);
INTCON.GIE = 1; // Enable interrupt;
if(J2 = 0xFF)
J1 = ~J1; // Complement of two;
J1 = J1 + 1;
J2 = ((J1 & 0x01)* 5); // Get decimal value;
J1 = J1 >> 1; // From the 2byte variable;
value = ((J1*10) + J2); // ((J1*10) + J2)
Delay_ms(500);
}
void main()
{
CMCON |= 7; // Set AN pins to Digital I/O;
OPTION_REG = 0x80; // Set timer TMR0;
digit = 0;
portb_index = 0;
shifter = 1;
TMR0 = 0;
INTCON = 0xA0; // Disable interrupt PEIE,INTE,RBIE,T0IE
PORTA = 0; // Turn off both displays
TRISA = 0; // All port A pins are configured as outputs
PORTB = 0; // Turn off all display segments
TRISB = 0; // All port D pins are configured as outputs
do {
sensor();
//Prepare digits for display;
digit = value % 10u; // Extract ones digit,
portb_array[0] = mask(digit); // and store it to PORTB array;
digit = (value / 10u) % 10u; // Extract tens digit,
portb_array[1] = mask(digit); // and store it to PORTB array;
digit = (value / 100u) % 10u; // Extract hundreds digit,
portb_array[2] = mask(digit); // and store it to PORTB array;
digit = value / 1000u; // Extract thousands digit,
portb_array[3] = mask(digit); // and store it to PORTB array;
} while(1);
}If i force to a specific value, that value is displayed on digits, but also have to do this line commented: //value = ((J1*10) + J2);
At this moment all four digits varies between 0000 and 0260. I think the issue begin when transform in decimal value.
Does anyone have any idea to fix this problem?
Kind Regards,
ducu
Last edited:
