Touchless Water Dispensing System

Abstract

The Automatic Water Dispenser Using Ultrasonic Sensor is a microcontroller-based system designed to provide a touchless and efficient method of dispensing water. This project aims to promote hygiene, reduce water wastage, and improve user convenience by automating the water dispensing process through object detection. The system utilizes an Arduino Uno as the main controller, integrating various electronic components such as an ultrasonic sensor, L298N motor driver, 5V water pump, LCD display, and a water gallon as the water source. The ultrasonic sensor is responsible for detecting the presence of an object, specifically a drinking glass, placed within a predefined distance range. Once the sensor detects the glass, the Arduino activates the water pump through the L298N motor driver. Initially, the system dispenses a measured amount of water equivalent to 100 milliliters. After reaching the 100 mL volume, the dispenser automatically switches to continuous water flow as long as the glass remains detected by the sensor. This feature allows users to choose between a small measured amount and a continuous supply without manual control. When the glass is removed from the sensor’s detection range, the ultrasonic sensor immediately signals the Arduino to stop the water pump, ensuring that water flow ceases instantly. This prevents unnecessary water loss and enhances system efficiency. Additionally, an LCD module is incorporated to provide real-time feedback to the user. The display indicates whether an object is detected, confirms when the initial 100 mL has been dispensed, and shows when the system is operating in continuous mode. Experimental testing showed reliable object detection, fast system response, and consistent dispensing performance across multiple trials. Overall, the project demonstrates an effective application of ultrasonic sensing and microcontroller programming in creating an automated, contactless water dispensing system suitable for homes, schools, and public environments.