#define LED_BLUE 19
#define LED_RED 18
#define LED_YELLOW 5
#define BUTTON_PIN 15

void setup() {
  pinMode(LED_BLUE, OUTPUT);
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);

  // Set LED initial state
  digitalWrite(LED_BLUE, LOW);
  digitalWrite(LED_RED, LOW);
  digitalWrite(LED_YELLOW, LOW);
}

void loop() {
  if (digitalRead(BUTTON_PIN) == HIGH) {
    // Jika tombol ditekan, nyalakan LED secara berurutan
    digitalWrite(LED_BLUE, HIGH);
    delay(500);
    digitalWrite(LED_BLUE, LOW);

    digitalWrite(LED_RED, HIGH);
    delay(500);
    digitalWrite(LED_RED, LOW);

    digitalWrite(LED_YELLOW, HIGH);
    delay(500);
    digitalWrite(LED_YELLOW, LOW);
  }
}