#define BUTTON1_PIN 18   // Tombol 1 pada GPIO 4
#define BUTTON2_PIN 19  // Tombol 2 pada GPIO 13
#define BUTTON3_PIN 20  // Tombol 3 pada GPIO 14
#define LED_PIN 21

void setup() {
  // Atur pin sebagai input dengan pull-up internal
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  Serial.begin(115200);
}

void loop() {
  // Baca status setiap tombol
  int button1State = digitalRead(BUTTON1_PIN);
  int button2State = digitalRead(BUTTON2_PIN);
  int button3State = digitalRead(BUTTON3_PIN);

  // Cek apakah tombol ditekan (LOW)
  if (button1State == LOW) {
    Serial.println("Tombol 1 ditekan");
       digitalWrite(LED_PIN, HIGH);
  }
  if (button2State == LOW) {
    Serial.println("Tombol 2 ditekan");
      digitalWrite(LED_PIN, HIGH);
  }
  if (button3State == LOW) {
    Serial.println("Tombol 3 ditekan");
      digitalWrite(LED_PIN, HIGH);
  }

  delay(200);  // Debounce sederhana
}