// Sistem Alarm Anti Maling Dengan Sensor Ultera Sonik

#define trigerPin 12
#define echoPin 13
#define ledPin 2
#define speakerPin 10
#define pitch 262

double duration, distance;

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

// led
pinMode(ledPin, OUTPUT);

// sepiker atau buzzer 
pinMode(speakerPin, OUTPUT);
}

void loop(){
  // sensor ultera sonik
digitalWrite(trigerPin, LOW);
delayMicroseconds(2);
digitalWrite(trigerPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigerPin, LOW);
delayMicroseconds(2);

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

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

// mempertimbangkan jarak maksimum pintu
if(distance>200) {
digitalWrite(ledPin, HIGH);
tone(speakerPin, pitch);

delay(200);
digitalWrite(ledPin, LOW);

noTone(speakerPin);
delay(200);
}

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