#include <Servo.h>

const int trigPin = 10;
const int echoPin = 9;
const int servoPin = 5;
Servo myServo;

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

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1; // Hitung jarak dalam cm
  
  if (distance <= 20) { // Jika jarak kurang dari atau sama dengan 20 cm
    myServo.write(90); // Buka tutup
    delay(2000); // Tunggu 2 detik
    myServo.write(0); // Tutup kembali
  }
  delay(500);
}