//Bel Sederhana menggunakan arduino 

void setup() {
  pinMode (8, INPUT);
  pinMode(2, OUTPUT);
}

void loop() {
  int switch_state=digitalRead(8);
  if(switch_state==HIGH){
    digitalWrite(2, HIGH);
    tone(2,1000);
  }
  else{
    digitalWrite(2,LOW);
    noTone(2);
  }
}