//membuat alarm pencurian
//define variabel
#define trigerPin 12
#define echoPin 13
#define ledPin 14
#define speakerPin 18
#define pitch 262

double duration, distance;

void setup() {
  //setup untuk sensor
  Serial.begin(9600);
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, OUTPUT);

  //setup untuk led
  pinMode(ledPin, OUTPUT);

  //setup untuk speaker
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  //looping sensor (membuat sensor wave)
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);

  //membuat durasi
  duration = pulseIn(echoPin, HIGH);

  //mengkalkulasi jarak
  distance = (duration/2) * 0.0343;

  //concider max width of the door = 200 cm
  if(distance<200){
    digitalWrite(ledPin, HIGH);
    tone(speakerPin, pitch);
    delay(300);
    
    digitalWrite(ledPin, LOW);
    noTone(speakerPin);
    delay(300);

  }
  else{
    digitalWrite(ledPin, LOW);
    noTone(speakerPin);

  }
}