Make Auto decrease Counter use multiplexing seven segment display with microcontroller (use interrupt)

Welcome to MINA TECHNOLOGY.

In this tutorial we will learn how to make Auto decrease Counter use Timer / Counter Overflow Interrupt. Here I am use PIC16F877A Micrcocontroller and 3 digit multiplexing seven segment display. You can watch the video or read the written tutorial below.

Circuit Diagram of Auto Increase counter 

circuit diagarm

Mikro C Code For Auto Increase Counter:

char display[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
int i;
char digit1,digit2,digit3;
void interrupt(){
     if(i==1000)i=0;
     //if(i==-1)i=0;
     digit1 = i/100;
     digit2 = (i/10)%10;
     digit3 = i %10;
     
     PORTB = display[digit1];
     PORTD = 0X01;
     delay_ms(5);
     PORTD = 0X00;
     
     PORTB = display[digit2];
     PORTD = 0X02;
     delay_ms(5);
     PORTD = 0X00;
     
     PORTB = display[digit3];
     PORTD = 0X04;
     delay_ms(5);
     PORTD = 0X00;
     T0IF_bit = 0;
     }
     
void main() {
     TRISB = 0X00;
     TRISD = 0X00;
     PORTB = 0X00;
     PORTD = 0X00;
     TMR0 =0;
     OPTION_REG = 0X06;
     INTCON = 0XA0;
     while(1){
              for(i=999;i>=0;i--) delay_ms(50);
              }



}



Click the downlaod button for Program File:

downlaod