// C++ Arduino Code (Copy Below)

#include <Servo.h>

 

Servo dustbinServo;

 

// Define pins

const int trigPin = 5;

const int echoPin = 6;

const int servoPin = 9;

 

// Variables

long duration;

int distance;

 

void setup() {

  dustbinServo.attach(servoPin);

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  dustbinServo.write(0); // Lid closed

  Serial.begin(9600);

}

 

void loop() {

  // Send ultrasonic pulse

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

 

  // Read echo time

  duration = pulseIn(echoPin, HIGH);

 

  // Calculate distance (in cm)

  distance = duration * 0.034 / 2;

 

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

 

  // If object is near (less than 15 cm)

  if (distance > 0 && distance < 15) {

    dustbinServo.write(90);  // Open lid

    delay(3000);             // Keep open for 3 seconds

    dustbinServo.write(0);   // Close lid

  }

 

  delay(300);

}