int merah = 4;
int kuning = 3;
int hijau = 2;

void setup() {
  Serial.begin(9600);
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(hijau, OUTPUT);
}

void loop() {
  Serial.println("Pilih mode nyala lampu:");
  Serial.println("1. Menyala Semua");
  Serial.println("2. Menyala Bergantian");
  Serial.println("3. Bergantian Terbalik");
  Serial.println("4. Berkedip-kedip");
  Serial.println("Mode mana yang anda pilih? ");

  while (Serial.available() == 0) {
    // Tunggu input dari serial
  }

  int pilihan = Serial.parseInt();

  switch (pilihan) {
    case 1:
      digitalWrite(merah, HIGH);
      digitalWrite(kuning, HIGH);
      digitalWrite(hijau, HIGH);
      delay(3000);
      break;

    case 2:
      digitalWrite(merah, HIGH);
      delay(1000);
      digitalWrite(kuning, HIGH);
      delay(1000);
      digitalWrite(hijau, HIGH);
      delay(1000);
      break;

    case 3:
      digitalWrite(hijau, HIGH);
      delay(1000);
      digitalWrite(kuning, HIGH);
      delay(1000);
      digitalWrite(merah, HIGH);
      delay(1000);
      break;

    case 4:
      for (int i = 0; i < 3; i++) {
        digitalWrite(merah, HIGH);
        digitalWrite(kuning, HIGH);
        digitalWrite(hijau, HIGH);
        delay(1000);
        digitalWrite(merah, LOW);
        digitalWrite(kuning, LOW);
        digitalWrite(hijau, LOW);
        delay(1000);
      }
      break;

    default:
      digitalWrite(merah, LOW);
      digitalWrite(kuning, LOW);
      digitalWrite(hijau, LOW);
  }
}