//Muhammad Rasyid
//20/464225/SV/18544
//HandsOn1 Interrupt

const int ledPin = 12;   //ledPin
const int buttonPin = 2; //Button to perform interrupt
int x=0, y=0;            //some variables to increment
int ledToggle = LOW;     //led state
//variables to keep track of the timing of recent interrupts
unsigned long button_time = 0;
unsigned long last_button_time = 0;
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT_PULLUP);
Serial.begin(9600);
attachInterrupt(digitalPinToInterrupt(buttonPin), button_ISR, CHANGE);
}
void loop(){
Serial.print("loop " );
Serial.print(x++ );
Serial.println();
delay(500);
}
void button_ISR(){
button_time = millis();
//check to see if increment() was called in the last 250 milliseconds
if (button_time - last_button_time > 250){
Serial.print("Interrupt ");
Serial.print(y++);
Serial.println();
ledToggle = !ledToggle;
digitalWrite(ledPin, ledToggle);
last_button_time = button_time;
}
}