Automatic Room Light Intensity Detection and Control Using a Microprocessor and Light Sensors

• Main Authors: Yi-Te Ku, 古義德
• Other Authors: Ying-Wen Bai
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/80823678697407956394

碩士 === 輔仁大學 === 電子工程學系 === 97 === In this paper we propose two designs using both a microprocessor and light sensors for automatic room light detection and control to save energy. The purpose of our designs is to lower the human judgment. By using the RF technology, the lights in a typical home can be controlled without wire lines. The systems are both designed to be low cost and low power consumption due to being microprocessor-based. As the first of our designs we will introduce the HLCM (Home Light Control Module) which will be installed in every light fixture of a family. The HLCM detects if a human body is present or not by using the PIR sensor circuit. If there is no human body present, all lights are turned off. If there is, the HLCM then detects the light intensity under the environment by using the light sensor circuit, and the system maintains sufficient room light by switching lights on/off. The result of using the HLCM shows that the total power consumption can be reduced. As the second design, we will introduce the FLCM (Fuzzy Light Control Module) which is similar to the first design. The FLCM detects not only if a human body enters the detection area or not but also the light intensity under the environment. The difference from the HLCM is that we use the fuzzy logic theory to design a fuzzy logic light controller to reduce energy. Using our design one can achieve high efficiency in home light power management.