#include <Servo.h>

const int trigPin = 2;
const int echoPin = 3;
const int buzzerPin = 5;

Servo myServo;
const int servoPin = 6;

long duration;
int distance;

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

  myServo.attach(servoPin);
  myServo.write(90); // Servo terbuka pada awalnya

  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;

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

  if (distance < 100) {
    digitalWrite(buzzerPin, HIGH);
    myServo.write(0);  // Servo tertutup
  } else {
    digitalWrite(buzzerPin, LOW);
    myServo.write(90);  // Servo terbuka
  }

  delay(500);
}