#include <Servo.h>

//pin sensor jarak
const int trigPin = 2;
const int echoPin = 3;

//pin akurator motor servo
const int servoPin = 5;

//pin lampu LED
const int ledPin = 7;

//pin buzzer
const int buzzerPin = 8;

Servo servo;

void setup() {
  pinMode(trigPin,OUTPUT);
  pinMode(echoPin,INPUT);
  pinMode(ledPin,OUTPUT);
  pinMode(buzzerPin,OUTPUT);

servo.attach (servoPin);
servo.write(0); //posisi awal palang pintu tertutup

Serial.begin(9600);

}

void loop () {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,LOW);
  duration = pulseIn(echoPin,HIGH);



//MENGHITUNG jarak
distance = duration * 0.034 / 2;


if(distance > 0 && distance < 10){
  openGate ();
  blinkLEDAndBuzzer();
} else {
  closeGate ();
  turnOFFLEDAndBuzzer();
}

delay(100);
}

  void openGate () {
  servo.write(90);
  delay(1000);
}

void closeGate () {
  servo.write(0);
  delay(1000);
}

void blinkLEDAndBuzzer () {
digitalWrite(ledPin,HIGH);
tone(buzzerPin,100);
delay(500);
digitalWrite(ledPin,LOW);
tone(buzzerPin,500);
delay(500);
}

void turnOFFLEDAndBuzzer () {
digitalWrite(ledPin,LOW);
noTone(buzzerPin);
}