![]() ![]() Once the brain is unable to perceive the pattern of switching on and off, it starts to average out the pattern and interprets it as brightness. What this means is if you were to look at a lamp that was flashing at an increasing rate, there would come a point where the lamp was flashing so quickly it would appear to always be on. Persistence of vision is somewhat of an optical illusion, whereby light entering the eye is perceived to be still present for some time after the the light ceases to enter the eye. It uses the same principle that a television uses to produce a motion picture. ![]() This is the magic technique that we can use to dim a LED.ĭon’t let the technical jargon in the name worry you, the concept of PWM is very simple. In this article we will cover the basics of pulse width modulation, or PWM. If you want to understand the fundamentals of how to dim a LED so you can build your own dimmer, or you simply want to understand how this process works then you have come to the right place!
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