Design and Simulation of Smart Touchless Dispenser Using AT89C51 Microcontroller

Abstract: In the wake of increasing hygiene awareness, automation in liquid dispensing systems has gained significant relevance. This paper presents a low-cost, efficient, and compact solution for a smart touchless dispenser using the AT89C51 microcontroller. The system is designed to activate and deactivate a DC motor based on simple button-based user input, mimicking gesture control without the need for expensive sensors or complex interfacing modules. The use of push buttons as gesture proxies simplifies the hardware design and makes the system accessible for educational and prototype purposes. The motor-driven mechanism facilitates the dispensing of liquid such as soap or sanitizer in a contactless manner. The primary objective is to demonstrate how basic embedded system components can be utilized to implement practical automation with minimal resources. The proposed system ensures easy integration, low power consumption, and real-time response, making it ideal for public hygiene systems and small-scale embedded projects.