#include <Servo.h>
//pinsensor jarak

const int trigPin = 2;
const int echoPin = 3;

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

//pin lamp 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 palang 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(1000);
}

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

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

void blinkLEDAndBuzzer(){
  digitalWrite(ledPin,HIGH);
  tone(buzzerPin,1000);
  delay(500);
  digitalWrite(ledPin,LOW);
  tone(buzzerPin,500);
  delay(500);
}

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