int pushbutton = 12; //pin pushbutton
int lamp1 = 9; //pin LED 1
int lamp2 = 5; //pin LED 2

void setup() {
  // put your setup code here, to run once:
  pinMode(pushbutton, INPUT_PULLUP);
  pinMode(lamp1, OUTPUT); //set pin LED sebagai OUTPUT
  pinMode(lamp2, OUTPUT); //set pin LED sebagai OUTPUT
}

void loop(){
  // put your main code here, to run repeatedly:
  if(digitalRead(pushbutton)==LOW) { //jika tombol ditekan
  digitalWrite(lamp1, HIGH); //menghidupkan LED
  digitalWrite(lamp2, LOW); //mematikan LED
  delay(300); //tunda 3 detik 
  digitalWrite(lamp1, LOW); //mematikan LED
  digitalWrite(lamp2, HIGH); //menghidupkan LED
  delay(300); //tunda 3 detik
  digitalWrite(lamp1, LOW); //mematikan LED
  digitalWrite(lamp2, LOW); //mematikan LED

  }
}