uC: PIC16F628a

Compiler: Hi-TECH PICC

Goal: To connect button and learn how to enable IO

One from simplest things you can try with microcontroller – to connect button and make uC to do what you want.

Just a simple code there:

#include <htc.h>
 
#define _XTAL_FREQ 4000000 //Clock 4MHz
 
__CONFIG(MCLREN & WDTDIS & UNPROTECT);
 
unsigned char sRB1=0;  //led is off initially
 
void main() {
 TRISB = 0b11111101;  // B2 output
 RB1 = 0;             // make В1 0
 for (;;) {
 if (RB0 == 0) {
 __delay_ms(30);  //debounce
     if (RB0 == 0) { sRB1 = !sRB1;}
 }
 RB1 = sRB1;
 }
 
}

Debounce is realized with delay macro, easy not optimal, but easy…