const int ledMerah = 9;
const int ledBiru = 10;
const int buzzer = 8;
const int tombol = 2;

bool nyala = false;
bool tombolSebelumnya = HIGH;

void setup() {
  pinMode(ledMerah, OUTPUT);
  pinMode(ledBiru, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(tombol, INPUT_PULLUP); 
  Serial.begin(9600);
}

void loop() {
  bool tombolSekarang = digitalRead(tombol);
  
  if (tombolSekarang == LOW && tombolSebelumnya == HIGH) {
    nyala = !nyala;
    delay(200);   }

  tombolSebelumnya = tombolSekarang;

  if (nyala) {
    digitalWrite(ledMerah, HIGH);
    tone(buzzer, 900);
    delay(200);
    digitalWrite(ledMerah, LOW);
    noTone(buzzer);
    digitalWrite(ledBiru, HIGH);
    tone(buzzer, 800);
    delay(200);
    digitalWrite(ledBiru, LOW);
    noTone(buzzer);
  } else {
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledBiru, LOW);
    noTone(buzzer);
  }
}