Joe Farr wrote:
>
> You have to admit, it has a certain "I want one now" feel about it :-)

> >And what would be really cool using a stepper motor is when you power up
> the project, the control 'moves' back to the last >stored position nice and
> smooth...
>
> Or when  you use the infrared remote, the control tracks the action of the
> remote.


I just injected 25mA into the test setup, with the
motor driven by 4 PIC pins, 25mA each in unipolar
mode 2-phase on mode, there is *enough* torque to
turn the motor. :o)
Motor:
(norm 12v 150mA from an old disk drive)
63 ohms, 1.6v @ 25mA per coil unipolar

So this is viable! 2 PIC pins to sense dial being turned,
another 4 pins to turn it. With unipolar mode and such
low coil current you don't even need flyback diodes etc.
Very nice. :o)
-Roman

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