const int buzzerPin = 1;
const unsigned long interval = 100;
unsigned long prevMillis = 0;
bool buzzerState = false;

void setup() {
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  unsigned long currentTime = millis();
  
  if (currentTime - prevMillis >= interval){
     prevMillis = currentTime;
     
     // Matikan buzzer jika sedang menyala
     if (buzzerState) {
       noTone(buzzerPin);
       buzzerState = false;
     } else {
       // Nyalakan buzzer dengan frekuensi tertentu
       tone(buzzerPin, 1800, 20);
       buzzerState = true;
     }
  }
}