int buzzer = 2;
int tombol = 4;
void setup() {
  // put your setup code here, to run once:
pinMode(buzzer, OUTPUT);
pinMode(tombol, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(tombol) == LOW){
noTone(buzzer);
delay(1000); 
tone(buzzer, 1000);
delay(1000); 
}
else{
noTone(buzzer);
delay(1000); 
}
}