Design and Implementation of Human Detection and Delay Time Based Automatic Water Shut off System

Abstract

The Design and Implementation of Human Detection and Delay Time Based Automatic Water Tap Shutoff System is developed to reduce water wastage caused by users forgetting to close water taps. The system uses a PIR sensor to detect human presence and an Arduino UNO microcontroller to control the operation of a solenoid valve through a relay module The proposed system supports both manual and automatic modes of operation. In automatic mode, water flow is controlled based on human presence. When a user is detected, the water tap remains active. If no movement is detected for a predefined delay time, the Arduino automatically closes the solenoid valve, stopping the water flow and preventing unnecessary water wastage. The delay mechanism ensures smooth operation by avoiding immediate shut-off during temporary inactivity. The system is cost-effective, energy-efficient, and easy to implement using readily available components such as Arduino UNO, PIR sensor, relay module, and solenoid valve. It provides a practical solution for water conservation in hostels, public restrooms, educational institutions, and other public facilities. This project demonstrates the effective use of embedded systems and automation technology in addressing real-world resource management challenges and promoting sustainable water usage.

Introduction

The project, "Design and Implementation of Human Detection and Delay Time Based Automatic Water Tap Shutoff System," aims to reduce water wastage in public places such as hostels, schools, and restrooms by automatically controlling water flow based on human presence. The system uses a PIR sensor to detect users, an Arduino UNO to process signals, a relay module, and a solenoid valve to control the water supply. It supports both manual and automatic modes. In automatic mode, water flows while a person is detected. When the user leaves, a preset delay timer starts, and if no motion is detected during this period, the Arduino closes the solenoid valve to stop the water flow. The delay feature prevents unnecessary shutoffs during temporary inactivity, improving user convenience.

The literature survey highlights that sensor-based automation, Arduino microcontrollers, and solenoid valves are widely used in smart water management systems due to their low cost, reliability, and energy efficiency. The proposed methodology integrates these technologies to provide an effective solution for conserving water.

The system consists of a PIR sensor, Arduino UNO, relay module, solenoid valve, manual switch, and power supply. The PIR sensor detects human movement, the Arduino processes the input and controls the relay, and the relay operates the solenoid valve to regulate water flow. The hardware implementation demonstrates a simple, cost-effective, and reliable design suitable for real-time applications.

Globally, water scarcity and wastage are major challenges, and automated water management systems are increasingly being adopted to promote sustainable water use. This project contributes to these efforts by reducing unnecessary water consumption through intelligent automation. Overall, the proposed system is economical, energy-efficient, easy to implement, and supports sustainable water conservation in public and commercial facilities.

Conclusion

The Human Detection and Delay Time Based Automatic Water Tap Shutoff System was successfully designed and implemented to reduce water wastage caused by unattended water taps. The system effectively combines a PIR sensor, Arduino UNO, relay module, and solenoid valve to monitor human presence and automatically control water flow. The incorporation of a delay time mechanism ensures smooth operation by preventing immediate shutoff during temporary inactivity, thereby improving user convenience. In addition, the availability of both manual and automatic modes provides flexibility and enhances the overall usability of the system. The experimental results demonstrated that the proposed system operates reliably and efficiently under different conditions. It successfully detects human presence, controls water flow automatically, and minimizes unnecessary water consumption. The use of low-cost and readily available components makes the system economical and suitable for practical implementation. Therefore, the developed system offers an effective solution for water conservation in hostels, educational institutions, public restrooms, hospitals, and other public facilities. Future enhancements such as IoT integration, remote monitoring, and water usage analytics can further improve the functionality and performance of the system, making it a smarter and more sustainable water

References

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Copyright

Copyright © 2026 Dr. Sundar G, Arulselvan G, Bharanidharan S, Bharathipriyan P, Dharanitharan S. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.