Automatic Room Light Controller with Bidirectional Visitor Counter

Wastage of electricity is a significant problem faced today. In various settings like homes, schools, colleges, or industries, lights and fans are often left on even when rooms are unoccupied due to negligence, forgetfulness, or hurry. To mitigate these situations, the “Automatic room light controller with visitor counter” project has been designed. This project comprises two modules: a “Digital Visitor counter” and an “Automatic room light controller”. The core concept behind this project is the “Visitor counter,” which measures the number of persons entering a room, such as a seminar hall, conference room, or classroom. This function is implemented using a pair of Infrared (IR) sensors. An LCD display positioned outside the room shows the current person count. The person count increments when someone enters the room, and concurrently, the lights are turned on. Conversely, the person count decrements when someone leaves the room. When the number of persons inside the room reaches zero, the lights are turned off using a relay interface, thereby performing the “Automatic room light controller” operation. Since two infrared sensors are utilized, the system also functions as a bidirectional person counter.