Intelligent Multi-coloured Lighting System Design with Fuzzy Logic Controller

Paul W Mutua,Mwangi Mbuthia

doi:10.11591/aptikom.j.csit.121

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.

Highlights

Nowadays lighting is seen as a way of creating a pleasant atmosphere in the interior as a whole and as a means of providing comfortable conditions in which to live and work [4]
Inputs to the simulation model were in form of constant values based on Simulink constant blocks specific for outdoor light intensity, red colour, green colour, blue colour, movement detector, number entering room, and number leaving room respectively
The simulation model outputs were monitored using the Simulink scope blocks each for window shade position controller output, the indoor light intensity level feedback, the rate of change of the indoor light intensity, the light emitting diodes (LEDs) fuzzy logic controller output, the light colour ratio product, and the LEDs‟ currents respectively

Summary

Introduction

Nowadays lighting is seen as a way of creating a pleasant atmosphere in the interior as a whole and as a means of providing comfortable conditions in which to live and work [4]. The current generations of light emitting diodes (LEDs) are more efficient, some having efficacies of more than 100 lm/w [7], [9], [10], [13]. The LED characterized by mercury-free, high efficiency, and long life cycle is expected to be the new generation light source [1], [13]. The use of control technology in electric light dimming, daylight harvesting, and movement detection can greatly improve lighting energy efficiency [5], [9], [10]. As more effort is devoted to investigating this method, multi-colour LEDs should have profound influence on the fundamental method that we use to produce and control light colour [6,7,8], [14]

Objectives

Methods

Results

Conclusion