#include <Servo.h>

const int trigPin = 9;
const int echoPin = 10;
const int servoPin = 3;

Servo myServo;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  myServo.attach(servoPin);
  myServo.write(0); // Posisi awal servo
}

void loop() {
  long duration;
  int distance;

  // Trigger sensor ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Membaca durasi pantulan suara
  duration = pulseIn(echoPin, HIGH);
  
  // Menghitung jarak (cm)
  distance = duration * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.println(distance);

  // Logika kontrol servo
  if (distance < 20) {
    myServo.write(90); // Servo bergerak ke 90 derajat
  } else {
    myServo.write(0);  // Servo kembali ke 0 derajat
  }

  delay(200);
}