Research And Design Of The Intelligent Lighting Control System Based On CAN Bus

Regarding energy saving and environment protection, Green Lighting has been introduced for lighting system in the beginning of 1990's. Green Lighting Program has been introduced in china in 1996, which is adopted to developing and popularizing lighting appliance, establishing an economic, suitable, and reliable lighting system with high quality and high efficiency as well as environment protection.Currently, residential lighting power consumption is about 20-30% power consumption for construction, but electrical companies focusing on intelligent lighting adopt open loop control for dimmer or scene controller. Upon entering working area, people would turn on necessary light according to the work and adjust light out to expected iluminattio level. After that, they would not adjust light out according to indoor lighting intensity any more. And light out adjustment would be easily ignored under such circumstance with fine light. Thus, suitable working conditions will not be realized; in addition, it will result in unwanted energy waste and economic loss.In view of aforementioned issues, this paper introduced an intelligent lighting system based on CAN bus. The intelligent lighting system is a distributed control system, which can realize decentralized control and centralized management. In the main control room, administrative staff can create a comfortable environment via proper configuration, meanwhile, energy saving can be achieved, too. The intelligent controller detects environment illumination level through optic electric transducer; then it compare the value with set point; finally, it adjust output of light to expected level. Via infrared sensor, the controller will turn off light of void area automatically. The intelligent lighting system based on CAN bus introduced in this paper can not only provide suitable illumination, but also save the energy with response to Green Lighting Program in China.This paper mainly introduced hardware design of CAN node based on AT89C52, including circuit design of data acquisition module (DAM), actuator module, and network communication. Block programming methods were applied to software design of lighting control system, including main procedure design and communication procedure design of the controller, and communication protocol for application layer of CAN bus was made, too. Finally, HMI design for top management system of intelligent control system was accomplished using Visual Basic to realize data exchange with site node which meet the requirements of centralized management.The experiment shows that the intelligent lighting control system based on CAN bus proposed in this paper is feasible, and each circuit of the system can be operated stable and reliable, which meets the designed function and requirements as well.