In this Tutorial we will learn how to blinking multiple LED using PIC Microcontroller. Here I we are using PIC16F877A Microcontroller and MikroC pro for PIC compiler for this project. You con watch the following video or read the written tutorial below.

I/O pin of PIC16F877A microcontroller

PIC16F877A Microcontroller has A0-A7, B0-B7, C0-C7, D0-D7 and E0-E2 input/output port. Some pins for these I/O port are multiplex with an alternative function for the peripheral feature on the device. In general, when a peripheral is enable, that pin may not used as a general purpose I/O pin.

In this project we will use PORTB for blinking LED. For  controlling PORTB it has two register TRISB and PORTB.
The TRISB Register controls the direction of Input/Output port. Here PORTB is 8bit wide, bi-directional port. The corresponding data direction register is TRISB. Setting a TRISB bit (= 1) will make the corresponding PORTB pin an Input. Clearing a TRISB bit (=0) will make the corresponding PORTB pin an Output. 

void main( ) {         
TRISB = 0X00;                   // PORTB is output         
PORTB = 0X00;                   // clear PORTB         
while(1) {                      // endless loop                        
        PORTB= 0X00;            // PORTB is active high                        
        delay_ms(500);          // 500 ms delay                         
        PORTB = 0XFF;           // PORTB is active low                         
        delay_ms(500);          // 500 ms delay                         
        }         

}

Code Explain

Here I am use Mikro C pro for PIC compiler for code editing. In void main function I define PORTB is output by clearing TRISB register. Then we clear the PORTB register the B0-B7 all pins are output 0. In next, here I am use while loop for continues program execution and blinking LEDs. And then close the program.

Program Flowchart

Circuit Diagram

Download free source code

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