#include <Servo.h>

const int trigPin = 8;
const int echoPin = 7;
const int servoPin = 9;

long duration;
int distance;
Servo myServo;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  myServo.attach(servoPin);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  if (distance <= 50) { // jika objek terdeteksi dalam jarak 50 cm
    myServo.write(90);  // putar servo ke 90 derajat
  } else {
    myServo.write(0);   // putar servo kembali ke 0 derajat
  }

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(500);
}