How to Make Smart Dustbin using Arduino UNO, Ultrasonic Sensor & Servo Motor

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Project Level: Beginner

Time Required: 20–30 Minutes

Budget: Low Cost

Automation: Touchless Dustbin

INTRODUCTION

Want to build a touchless smart dustbin? This project automatically opens the lid when your hand comes near using an ultrasonic sensor and servo motor.

WATCH YOUTUBE VIDEO

COMPONENTS REQUIRED

Image	Name	Qty	Buy
	Arduino UNO	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff} $size={2}
	Ultrasonic Sensor	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Servo Motor	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Jumper Wires	-	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}

TOOLS REQUIRED

Image	Tool	Qty	Buy
	Screwdriver	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}
	Wire Cutter	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}
	Glue Gun	Optional	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}

APPS AND ONLINE SERVICES

Logo	App	Access
	Arduino IDE	{getButton} $text={Download} $icon={download} $color={#007bff}

CIRCUIT DIAGRAM

WIRING CONNECTIONS

Ultrasonic Sensor

Trig	Pin 5
Echo	Pin 6
VCC	5V
GND	GND

Servo Motor

Signal	Pin 7
VCC	5V
GND	GND

ARDUINO CODE

#include <Servo.h> Servo servo; int trigPin = 5; int echoPin = 6; int servoPin = 7; long duration, dist, average; long aver[3]; void setup() { Serial.begin(9600); servo.attach(servoPin); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); servo.write(0); delay(100); servo.detach(); } void measure() { digitalWrite(trigPin, LOW); delayMicroseconds(5); digitalWrite(trigPin, HIGH); delayMicroseconds(15); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); dist = (duration / 2) / 29.1; } void loop() { for (int i=0;i<=2;i++){ measure(); aver[i]=dist; delay(10); } dist=(aver[0]+aver[1]+aver[2])/3; if (dist<50){ servo.attach(servoPin); servo.write(150); delay(3000); servo.write(0); delay(1000); servo.detach(); } Serial.println(dist); }

WORKING PRINCIPLE

The ultrasonic sensor detects hand distance. When it is less than 50 cm, Arduino rotates the servo motor to open the lid. After a few seconds, the lid closes automatically.

STEPS

1. Connect all components
2. Upload code
3. Power the system
4. Test with hand movement

TIPS

• Adjust distance value if needed
• Use stable power supply
• Fix servo firmly

CONCLUSION

This smart dustbin project is a great beginner IoT and automation project.