Intelligent Multi-coloured Lighting System Design with Fuzzy Logic Controller

Abstract

This paper describes the design of an intelligent energy efficient lighting system that uses multi-coloured LEDs and a fuzzy logic controller to produce light of the required luminance level and colour in a typical room space. The lighting system incorporates automatic control of a room’s window shade opening, conveniently harvesting daylight. Appropriate room occupancy sensors were set to dim off the LEDs if there are no people in the room. A movement sensor was also considered for dimming the LEDs if the persons in the room are asleep. A colour decoder was included in the control system, to determine the LEDs’ output light colour and dim them off if the colour requirement is not selected. The colour decoder also closes the window shade if required light colour is not white. Two Fuzzy Logic controllers were used in the system; one to control opening of the room’s window shade via microcontroller, and the other to control the LEDs’ output luminance. The study was limited to simulation of the design in a MATLAB software environment using Fuzzy Logic Toolbox and Simulink blocks. The simulation test results confirmed that the LEDs’ output luminance decreases as the amount of daylight entering the room increases. The designed system intelligently saves lighting electrical energy while maintaining the room’s comfortable illumination levels and colour requirements.