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Introduction to Pulse Width Modulation. A look at a powerful technique for controlling analog circuits with a microprocessor's digital outputs. Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a microprocessor's digital outputs. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion.
The Gist. PWM works by varying the width of the on signal (read Duty Cycle) within a fixed signal frequency or period of time. So what we are really looking for is the length of time the signal remains high for each cycle. There are several ways to do this. The easiest is using the pulseIn function as shown below.