Taking a look at a very inexpensive (4$ CAD) PWM module. This board has three separate channels and a very nice LCD.
PWM stands for pulse width modulation, which is basically controlling voltage going to a device by chopping up a set voltage. the higher the on-time (PWM%) the more average voltage will be sent to the device.
This module is useful for speed controlling motors, dimming LEDs and a host of other things!
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Ebay 3 channel PWM Module
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