Not recommended, but I once drove a small stepper DIRECTLY from a
PIC16C84. The motor was spec'ed for 5 volts and 35 ohms per phase. I
drove each of the 4 phases from 2 PIC pins. I also put a resistor in
series with the motor windings but I don't remember the value. There was
just enough torque to drive a pointer.

Note that this was a classic case of PIC abuse! The PIC survived but is
marked with a big X scratched into it to make sure I never use it for
anything real.


-- Rich

p.s.  When a friend asked where the protections diodes were I just
grinned. Of course, they are in the PIC.




William Chops Westfield wrote:
>
> Well, I've been wanting to drive spindle motors with digitial logic (normally
> they get three-phase sine waves, right?)  And I'm pretty happy to see an
> existance proof that this works, even if it did happen due to misconceptions.
>
> Has anybody tried driving motors like this with things like TTL bus drivers?
> At 64mA current capability, it seems like this would be close to being able
> to make a motor move, at least in limitted torque situations...
>
> BillW
>
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