Arduino UNO Based Automatic Liquid Hand Sanitizer & Soap Dispenser System

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The Arduino UNO-based Automatic Liquid Hand Sanitizer Dispenser is a smart, touchless hygiene solution designed to promote safe and contact-free hand cleaning. This project uses dual HC-SR04 ultrasonic sensors to detect hand presence and automatically activate a 5V mini water pump via relay for dispensing sanitizer, while a MG996R servo motor operates a soap dispensing mechanism.

The system ensures hygiene by eliminating physical contact, making it ideal for schools, hospitals, offices, public places, smart washrooms, and IoT-based automation projects. The potentiometer can be used to adjust dispensing time or sensitivity, allowing customizable operation.

This project is perfect for:

  • Engineering mini projects

  • Science exhibition models

  • Contactless automation systems

  • Smart hygiene solutions

  • COVID-safety themed innovations

Key Features

✔ Touchless hand detection using ultrasonic sensors
✔ Automatic sanitizer dispensing using mini water pump
✔ Soap dispensing using MG996R servo motor
✔ Relay-controlled pump system
✔ Adjustable timing/sensitivity using potentiometer
✔ Safe and hygienic contactless operation

 Components Used

  • Arduino UNO

  • 2x HC-SR04 Ultrasonic Sensors

  • 5V Relay Module

  • 5V Mini Water Pump

  • MG996R Servo Motor

  • Potentiometer

  • Breadboard

  • Connecting Wires

  • External Power Supply

Code:
/*
 * Arduino UNO-based Automatic Liquid Hand Sanitizer Dispenser
 * Components:
 * - 2x HC-SR04 Ultrasonic Sensors
 * - 1x 5V Relay Module
 * - 1x 5V Mini Water Pump
 * - 1x Potentiometer
 * - 1x MG996R Servo Motor
 * - 1x Arduino UNO
 *
 * Functionality:
 * - Ultrasonic sensor 1 triggers the water pump via relay for hand sanitizer
 * - Ultrasonic sensor 2 triggers the servo motor for soap dispenser
 */

// Pin definitions
const int trigPin1 = A3;
const int echoPin1 = A2;
const int trigPin2 = 9;
const int echoPin2 = 8;
const int relayPin = 2;
const int servoPin = 6;
const int potPin = A0;

// Include Servo library
#include <Servo.h>
Servo soapServo;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize pins
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);
  pinMode(relayPin, OUTPUT);
  soapServo.attach(servoPin);

  // Set initial states
  digitalWrite(relayPin, LOW);
  soapServo.write(0);
}

void loop() {
  // Read distance from ultrasonic sensor 1
  long duration1, distance1;
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = (duration1 / 2) / 29.1;

  // Read distance from ultrasonic sensor 2
  long duration2, distance2;
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distance2 = (duration2 / 2) / 29.1;

  // Check distance for hand sanitizer
  if (distance1 < 10) {
    digitalWrite(relayPin, HIGH); // Turn on water pump
    delay(1000); // Pump for 1 second
    digitalWrite(relayPin, LOW); // Turn off water pump
  }

  // Check distance for soap dispenser
  if (distance2 < 10) {
    soapServo.write(90); // Push actuator
    delay(1000); // Hold for 1 second
    soapServo.write(0); // Reset actuator
  }

  // Small delay before next loop
  delay(100);
}

 Working Principle

  1. When hands are detected by Ultrasonic Sensor 1 →
    Arduino activates relay → Water pump dispenses sanitizer.

  2. When hands are detected by Ultrasonic Sensor 2 →
    Arduino rotates servo motor → Soap is dispensed.

  3. The potentiometer adjusts delay time or sensitivity.

This creates a fully automatic, dual-function touchless hygiene system.

 

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