void setup() {

  // put your setup code here, to run once:

  pinMode(8, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(2), apagar, RISING);

}

 

void loop() {

  // put your main code here, to run repeatedly:

  if (digitalRead(A0) == 1)

  {

    digitalWrite(8, HIGH);

    delay(5000);

  }

}

 

// ISR pin 2

void apagar() {

  digitalWrite(8, LOW);

}