IOT Based Digital Color Control for Multicolor LED Illumination System

Abstract

LED‘s are great. But with every project comes a point where flashing LED is just not enough. For such cases RGB( Red, Green, Blue) LED is the answer. With an RGB LED you would be able to glow any colour your heart desires. A single LED die can only emit monochromatic light which could be one of the three primary colors - red, green and blue, known as RGB. To realize more colors, three LED dies need to be used together for RGB color mixing. Commonly 7 colors can be produced by controlling the switch of the channel for each primary color. To produce more than 7 colors, each color channel should be able to change in brightness, not just switched on or off. A popular control method is PWM, of which the cycle duty range determines the available brightness levels. The more the levels are available, the more colors can be produced. Apart from the popularity in applications like outdoor decoration lighting in cities, stage lighting designs, home decoration lighting and LED display matrix, RGB color mixing technology can also be found recently in LCD backlighting and projectors.