unsigned long jeda = 1000;
unsigned long prevMillisMerah = 0;
unsigned long prevMillisKuning = 0;

void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
}

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

  // Untuk lampu merah
  if (currentMillis - prevMillisMerah >= jeda) {
    prevMillisMerah = currentMillis;
    digitalWrite(2, HIGH);
    delay(1000);
    digitalWrite(2, LOW);
  }

  // Untuk lampu kuning
  if (currentMillis - prevMillisKuning >= jeda) {
    prevMillisKuning = currentMillis + 500;
    digitalWrite(3, HIGH);
    delay(1000);
    digitalWrite(3, LOW);
  }
}