const byte ledPin = 13;
const byte interruptPin = 2;
volatile byte state = LOW;

void setup() {
  pinMode(ledPin, OUTPUT);
  //pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);
}

void loop() {
  if(state){
  digitalWrite(ledPin, state);
  delay(1000);
  state = !state;
  digitalWrite(ledPin, state);
  }
}

void blink() {
  state = true;
}