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Paul,
Due to the differences in processors and the availability to different users, what do you think of the concept of a "drive board" seperate from the "control board"? Ie, what if there was a board that had an input of logic-gnd, logic-5v, pwm signal, battery pack ground, battery source voltage and an output of motor terminals and 0-5V current sense and temperature sense?
This way, the controller could use any method of control on any digital platform for any skill level or accessability of designer... that is "black box" the left and right halves of your schematic so they can be built independantly.
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