Pulse Width Modulation (PWM) is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between ON and OFF. If you repeat this on-off pattern fast enough with a LED for example, the result is as if the signal is a steady voltage between 0 and VCC controlling the brightness of the LED.

└ src
     └ pwm

You'll find instructions and full documentation on HiBit. It includes detailed info on how to wire and use the module.

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