const int redLED = 13;
const int greenLED = 11;

unsigned long prevTime = 0;
const int baseInterval = 250; 

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
}

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

  if (currentMillis - prevTime >= baseInterval) {
    prevTime = currentMillis;

    // الأحمر يتغير كل 500ms (baseInterval * 2)
    static bool redState = LOW;
    
    if ((currentMillis / 500) % 2 == 0) {
      redState = !redState;
      digitalWrite(redLED, redState);
    }

    // الأخضر يتغير كل 250ms (baseInterval)
    digitalWrite(greenLED, !digitalRead(greenLED));
  }
}