//The provided code creates a smart dustbin system using an ultrasonic sensor and a servo motor.
#include <Arduino.h>
#include <Servo.h>

const int trigPin = 5;   // Trigger pin for ultrasonic sensor
const int echoPin = 6;   // Echo pin for ultrasonic sensor
const int servoPin = 7;  // Pin for servo motor

Servo servo;
long duration, distance;

void setup() {
  Serial.begin(9600);
  servo.attach(servoPin);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void measureDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(15);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;
}

void loop() {
  measureDistance();

  if (distance < 50) {
    servo.write(180);
    Serial.println("Bin lid open. Dispose waste.");
  } 
  else {
    servo.write(0);
    Serial.println("Bin lid closed.");
  }

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

  delay(1000);
}