Design of intelligent lighting control system for university classrooms based on stc89c52 microcontroller

EDN: https://elibrary.ru/GMDORR

Abstract

To address the issues of high energy consumption and inefficient management in university classroom lighting, an intelligent lighting control system based on the STC89C52 microcontroller is designed. The system employs infrared tube sensors to detect the number of occupants and their entry/exit status, utilizes a photoresistor and voltage comparator circuit for real-time ambient light measurement, and integrates a DS1302 clock module for time-based control. The software is modularized in C language, enabling functions such as occupancy counting, illumination assessment, scheduled switching, and manual/automatic mode selection. Simulation results show that the system can activate LED luminaires in zones according to the number of people present, and automatically turn off lights when daylight is sufficient or the classroom is empty, thereby significantly reducing electrical waste. With low cost, high reliability, and easy scalability, the system is well suited for energy-saving retrofits in various university classrooms.