Electricity wastage from lighting systems in educational institutions is a prevalent issue, with classroom lights often left on unnecessarily when unoccupied. This project addresses this problem by developing an Automatic-Lighting-Control-System that aims to save electricity through efficient management of classroom lighting. The system utilizes an IR motion sensor to detect human presence and a relay control to switch lights on or off accordingly, illuminating only occupied areas of the classroom. A counter-bidirectional approach using two IR sensors at entry/exit points counts the number of occupants to control lighting levels based on the density of people present. The system is powered by a solar-photovoltaic unit, comprising solar panels, a charge controller, and batteries, making it an eco-friendly solution. Experiments were conducted to analyze the solar panel's performance under varying temperatures and weather conditions in the local climate. Findings revealed the solar panel's efficiency reached up to 80% during peak sunshine hours, with temperature inversely affecting voltage output. In classrooms with lower student counts, significant energy savings of up to 3.19W/h were achieved compared to conventional lighting systems. This system presents a sustainable solution for minimizing electricity wastage in classroom lighting by intelligently managing illumination levels through occupancy sensing and solar-powered operation.
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