void setup()
 {

 pinMode(4,INPUT);
 pinMode(13,OUTPUT);

  attachInterrupt(digitalPinToInterrupt(2),TUTUP,FALLING);
}

void loop()
 {

int button2 = digitalRead(4);

if (button2 == 1) 
{
digitalWrite(13, HIGH);
}
 }

 void TUTUP()
 {
digitalWrite(13, LOW);
 }