void setup() 
{
 pinMode(4,OUTPUT);
 pinMode(3,INPUT);
 //pinMode(6,INPUT);
attachInterrupt(digitalPinToInterrupt(2), emergency, RISING);
}

void loop() 
{
 int button1 = digitalRead(3);
 //int button2 = digitalRead(6);


 if (button1 == HIGH)
{
  digitalWrite(4, HIGH);
}
//if (button2 == HIGH)
//{
  //digitalWrite(4, LOW);
//}
 }
void emergency()
{
digitalWrite(4, LOW);
}