This paper presents a cost-effective and innovative smart lighting and control system for classrooms, designed to address the issue of electricity waste caused by human negligence in turning off electrical appliances. The system uses dual passive infrared (PIR) sensors to detect human presence and a counter module to count the number of people entering and exiting the classroom. Based on the detected presence, the system automatically switches on or off the lighting and other electrical appliances. The TRIZ (Theory of Inventive Problem Solving) methodology is employed to ideate and design the system, ensuring its effectiveness and efficiency. The system consists of a power supply module, a counter module, and a switching module, all controlled by an AT89S51 microcontroller. The counter module uses dual PIR sensors installed at the entrance and exit doors to detect human movement, while the switching module controls the electrical loads. The system's functionality is validated through testing, demonstrating its ability to accurately count people and switch appliances on or off accordingly. The power consumption of the system is also evaluated, showing it to be relatively low, making it suitable for energy conservation initiatives. The study concludes with a discussion on the limitations of the system, such as the limited sensing range of PIR sensors, and suggests future improvements, including the integration of additional sensor technologies.This paper presents a cost-effective and innovative smart lighting and control system for classrooms, designed to address the issue of electricity waste caused by human negligence in turning off electrical appliances. The system uses dual passive infrared (PIR) sensors to detect human presence and a counter module to count the number of people entering and exiting the classroom. Based on the detected presence, the system automatically switches on or off the lighting and other electrical appliances. The TRIZ (Theory of Inventive Problem Solving) methodology is employed to ideate and design the system, ensuring its effectiveness and efficiency. The system consists of a power supply module, a counter module, and a switching module, all controlled by an AT89S51 microcontroller. The counter module uses dual PIR sensors installed at the entrance and exit doors to detect human movement, while the switching module controls the electrical loads. The system's functionality is validated through testing, demonstrating its ability to accurately count people and switch appliances on or off accordingly. The power consumption of the system is also evaluated, showing it to be relatively low, making it suitable for energy conservation initiatives. The study concludes with a discussion on the limitations of the system, such as the limited sensing range of PIR sensors, and suggests future improvements, including the integration of additional sensor technologies.