Design and Development of a Smart Ultrasonic-Based Touchless Alcohol Dispenser

This study presents the design and development of a Smart Ultrasonic Alcohol Dispenser that provides a touchless and automated solution for hand sanitation. The system utilizes an ultrasonic sensor integrated with an Arduino UNO microcontroller and a pump mechanism to detect the presence of a user’s hand and dispense a controlled amount of alcohol without physical contact. The ultrasonic sensor operates based on distance measurement, allowing accurate hand detection within a predefined range and triggering the dispensing process only when necessary. A descriptive and experimental research design was employed in the development of the system. The prototype was assembled and tested through multiple trials to evaluate hand detection accuracy, response time, consistency of alcohol dispensing, and occurrence of false triggers. Results showed that the dispenser responded quickly upon hand detection and consistently released a fixed volume of alcohol per activation. The ultrasonic sensor performed reliably under different lighting conditions, and the controlled dispensing logic effectively prevented over dispensing and minimized sanitizer waste. The study demonstrates that sensor based automation can significantly improve hygiene practices by reducing cross contamination and ensuring consistent sanitizer use. The Smart Ultrasonic Alcohol Dispenser offers a practical, low cost, and hygienic alternative to manual dispensers and is suitable for use in homes, schools, offices, and other public areas. Future enhancements may include adding a low alcohol level indicator, improving enclosure design, and conducting long term testing in real world environments.