int ledPins[] = {1, 2, 3, 4, 5, 6}; // LED pin numbers
int totalLEDs = 6;

void setup() {
  // Initialize LED pins as outputs
  for (int i = 0; i < totalLEDs; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // Menyala LED dari tengah ke luar
  for (int i = 0; i < totalLEDs; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(200);
    digitalWrite(ledPins[i], LOW);
    if (i < totalLEDs - 1) {
      delay(200);
    }
  }

  // Menyala LED dari luar ke tengah
  for (int i = totalLEDs - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(200);
    digitalWrite(ledPins[i], LOW);
    if (i > 0) {
      delay(200);
    }
  }
}