>>
I am stuck with this:
how do I control a motor from a PIC using one side of the motor tied to 1/2
rail(2.5v) and either grounding or connecting Vcc to the motor.  Now is the
problem:
<<

I don't know where the 2.5V is coming from, but this could cause some
unnecessary power dissipation.  I would control the motor with an H bridge
so that it can be driven +-5V, then use PWM to get the desired average
drive.  This will also work for the other motor you mentioned that needed to
go +-5V, just that the PWM percentage can go to 100 in that case.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

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