PWM
From FIRSTwiki
PWM stands for Pulse Width Modulation. A PWM signal is a square wave that transmits data by varying the widht of the signal, or time which it is high, creating an analog signal with limits, so to speak (any value between 0 and 1 inclusively). By varying the width of the signal, the speed controller can make changes to the speed the motors are run at.
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