// Define Pins
const int trigPin = 9;
const int echoPin = 10;
const int servoPin = 11;

// Define Variables
long duration;
int distance;

// Set up the servo
#include <Servo.h>
Servo myservo;

void setup() {
  // Set up the pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  myservo.attach(servoPin);

  // Wait for the servo to be in the closed position
  myservo.write(0);
  delay(5000);
}

void loop() {
  // Send a pulse to the sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the time it takes for the pulse to return
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance based on the speed of sound
  distance = duration * 0.034 / 2;

  // If an object is detected, open the lid
  if (distance < 10) {
    myservo.write(90);
    delay(3000);
    myservo.write(0);
  }
}