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By Jhon Doe
#83930 PWM works by pulsating DC current, and varying the amount of time that each pulse stays 'on' to control the amount of current that flows to a device such as an LED. ... PWM signals are typically square waves, like the one in the illustration below. A PWM signal (square wave) with a 50% duty cycle.
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By parkjonasa
#84296 Pulse Width Modulation (PWM) is a fancy term for describing a type of digital signal. Pulse width modulation is used in a variety of applications including sophisticated control circuitry. A common way we use them here at SparkFun is to control dimming of RGB LEDs or to control the direction of a servo motor.