int tombol = 3;
int lampu = 2;
int nilai_tombol;

void setup() {
  // put your setup code here, to run once:
pinMode(tombol, INPUT);
pinMode(lampu, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  nilai_tombol = digitalRead(tombol);
  if (nilai_tombol == HIGH){
    digitalWrite(lampu, HIGH);
    delay(500);
    digitalWrite(lampu,LOW);
    delay(500);
  } else{
    digitalWrite(lampu, LOW);
    
  }
  
}