// Switch LED by Pushbutton in C and C++
// Recreated By Faisal
// 22-March-2020

#include <avr/io.h>

const int led = 3;
const int button = 7;
int PBval = 0; // reading pushbutton pin status
int debounce = 300;
int LEDval = HIGH;

void setup() {
  // put your setup code here, to run once:
  pinMode (led, OUTPUT);
  pinMode (button, INPUT);
  PINA |= (1 << PINA7); // 1 to use internal pull-up resitor to pin A7, 0 to use external
  digitalWrite(led, LEDval);
}

void loop() {
  // put your main code here, to run repeatedly:
  PBval = digitalRead (button);
  if (PBval == LOW) {
    delay(debounce);
    LEDval = !LEDval;
    digitalWrite(led, LEDval);
  }
}