#define BTN_PIN 2
const int LED_PIN = 13;

bool ledState = false;   // status LED
bool lastButton = HIGH;  // status terakhir tombol (HIGH karena pakai INPUT_PULLUP)

void setup() {
  pinMode(BTN_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  int button = digitalRead(BTN_PIN);

  // deteksi perubahan (tombol ditekan)
  if (button == LOW && lastButton == HIGH) {
    // ubah status LED
    ledState = !ledState;
    digitalWrite(LED_PIN, ledState);
    delay(200); // debounce sederhana
  }

  lastButton = button;
}