> > I am building a small robot and I run into the problem of finding the
> > right Motor Driver and the method of controlling the motor.
> > I want to be able to make the robot go forward, backward, and stop.  I
> > also want to be able to control the speed.

The choice for hobbyists for me is pristine clear : use a stepper motor. You
have with it a perfect control of position and speed as far as you do not
surpass the motor capabilities. I have finished a small project for
controlling
a stepper motor with a 16F84. It works, it is easy to understand and you
can modify it since it is somewhat documented. This weekend I plan to add
a serial communication capability to the controlling PIC and later I plan to
connect two such devices to a third PIC so as to be able to making
coordinated
movements (yes, as you can guess, I am building robot rover). If you (or
somebody
else) is interested in the subject I can e-mail the assembly code, the
program
flowchart and the electric drawing (as soon as I have it finished).

Cheers

Joan

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