#define pb1 2       //Button 1 pada pin D2
#define pb2 3
#define pb3 4
#define LED1 5      //LED1 pada pin D5
#define LED2 6
#define LED3 7
#define ulang 8     //Button reset pada pin D8
#define buzzer 9
bool kunci = false;

void setup() {
  pinMode(pb1, INPUT_PULLUP);   //Setting I/O
  pinMode(pb2, INPUT_PULLUP);
  pinMode(pb3, INPUT_PULLUP);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(ulang, INPUT_PULLUP);
}

void loop() {
  if(kunci == false){               //Jika kunci terbuka, maka
    if(digitalRead (pb1) == LOW){       //Jika button 1 ditekan, maka
      digitalWrite(LED1, HIGH);         //LED 1 akan menyala
      kunci = true;                     //Mengunci
      tone(9,1000);
    }
    else if(digitalRead (pb2) == LOW){
      digitalWrite(LED2, HIGH);
      kunci = true;
      tone(9,1000);
    }
    else if(digitalRead (pb3) == LOW){
      digitalWrite(LED3, HIGH);
      kunci = true;
      tone(9,1000);
    }
  }
  else{                             //Jika terkunci, maka
    if(digitalRead (ulang) == LOW){ 
      kunci = false;                //Terbuka kalau tombol reset ditekan
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      delay(200);
      noTone(9);
    }
  }
}