Development of an Intelligent Light Intensity Control System for LED Lighting

This paper presents the development of an intelligent system for controlling LED light intensity from the onsite and remote location. The objective of this paper is to save electric power by implementing the digitally controlled dimming of the LED light source from different intelligent methods. In order to implement the proposed scheme at onsite location, a microcontroller board is programmed for supplying the digital dimming signals to dimmer circuit driving the LED load using pulse width modulated (PWM) signals that varies in proportion to the motion detected by the passive infrared (PIR) sensor. In order to felicitate the remote dimming, the digital dimming signals are supplied to the low-cost microcontroller board from the virtual instrument software architecture (VISA) driver of National Instruments LabVIEW software from the client computer. For this purpose, the web publishing tool of LabVIEW is used for transmitting the digital command signals for dimming control over the internet. The output diming signal at the microcontroller pin are isolated using an opto-coupler and are supplied to the dimmer circuit that controls the dimming of LED light load.