// Mendefiniskan Pin LED
int lampu1 = 4;
int lampu2 = 12;

// Waktu interval kedipan (dalam milidetik)
const unsigned long interval = 500;

unsigned long previousMillis = 0;
int ledState = LOW;

void setup() {
  // Atur pin LED sebagai output
  pinMode(lampu1, OUTPUT);
  pinMode(lampu2, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    // Toggle LED state
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }

    digitalWrite(lampu1, ledState);
    digitalWrite(lampu2, !ledState);
  }
}