Bob J. <rocketbob <at> gmail.com> writes:

> I am looking to build what is essentially an a huge radio-controlled servo
> with a stepper motor.  In order to drive the stepper motor, I have to
> convert the r/c receiver's pulses into step/direction pulses.  To my great
> surprise I googled for something off-the-shelf to do this, but have come up
> empty-handed.  Has anyone done this sort of thing?

It is not so simple to do it. There are a lot of things to handle for the
stepper drive (including open loop and how to deal with it if the link goes away
and comes back). Also with the voltage available for RC driving a stepper will
not go down so well (too few volts, too much voltage drop in the driver, too
much quiescent current etc). Are you absolutely sure you want to do it with a
stepper ? Code for a PIC to do it is really straightforward especially if it's
open loop and fixed speed (preferrably the RC frame speed - i.e. 50Hz).

Peter P.


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