Hello,

I want to occasionally control a ~1.5V DC motor from a PIC circuit
running from 3V.  The speed isn't critical.  Power consumption, both
while the motor is running and when not, is important (it's battery
powered, and this will be where the bulk of the energy goes), and space
could be important later.  It's a one-off hobby project, so I'm not
worried about saving every last penny in components.

It seems like overkill including a full SMPS.  Would it work to feed a
pulsed 3V to the motor through a transistor at a suitable (possibly
empirically determined) duty?  I'm a bit worried about (a) ruining the
motor, and (b) wasting lots of current in the protection diode during
the off periods.

I'm intending to use a 12F629 or 675 which only has one spare pin,
although it's possible I could free up another for a comparator/ADC.

I'd be grateful for any ideas!

Cheers,

Chris

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