Introduction

This experiment demonstrates how to build a smart dustbin using an ultrasonic sensor to detect when the bin is full and open the lid automatically.

Components Needed

• Ultrasonic Sensor (HC-SR04)
• Servo Motor
• Arduino
• Jumper Wires

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Circuit Setup

1. Connect the ultrasonic sensor to the Arduino to measure the distance to the waste.
2. Connect the servo motor to the Arduino to open/close the dustbin lid.

Code for Smart Dustbin

Upload the following code to your Arduino to control the dustbin lid:

#include 

const int trigPin = 9;
const int echoPin = 10;
Servo lidServo;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lidServo.attach(11);
}

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;
  
  Serial.print("Distance: ");
  Serial.println(distance);
  
  if (distance < 10) {
    lidServo.write(90); // Open lid
  } else {
    lidServo.write(0); // Close lid
  }
  delay(500);
}
            

Explanation

The ultrasonic sensor measures the distance to the waste, and when the bin is full, it automatically opens the lid using the servo motor.

Troubleshooting

• If the servo motor does not move, check the wiring and the servo pin assignment in the code.
• If the distance readings are inaccurate, ensure the ultrasonic sensor is correctly placed.