Still trying to find my blueprints for it (I think its on my Ubuntu box, 
but my monitor is fried on it, grrr, and I'm sure its not accessable on 
FTP, I'm on my Windows 10 workstation now), but here is an interesting 
example of MOSFET motor speed control via GPIO or PWM.

<https://lh3.googleusercontent.com/-t5hSWcWiaOI/WI_oso8HoII/AAAAAAAAAEY/hsVVFtRJMtcicWmLBKmNOLaIFMAqVWlnACLcB/s1600/dc_motor_speed_control_pic12f1822_pwm_potentiometer.png>

The top center part of it is kind of dumb in that I think their point is to 
use a pot read by an ADC to do the speed control. However I would do it via 
UART or software instead. However the rest of the circuit is a great 
example of real motor speed control using an inexpensive MOSFET driven by 
MCU or BBB PWM.

On Monday, January 30, 2017 at 6:19:30 PM UTC-7, woody stanford wrote:
>
> I posted the remote control for this in Software, but I put a bunch of 
> hardware in it so I thought I'd post it here.
>
>
> https://groups.google.com/forum/#!category-topic/beagleboard/software/evSIUcuWfUY
>

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