Peter,

Why can't the boost be driven off of an IO pin?  Is there a current problem?

Vbat
-----|>-------|>-------- Vboosted
         |          |
         =          =
         |          |
----------          _ GND
 Pic io
ON 3.3 V to 5 V
OFF 0 V

I guess the toggling pic IO pin would have to be stopped to limit the
Vboosted to 6.5 volts or so.  I could use one of the PIC comparators for
that.  I would then run the output through a 5volt regulator to remove
ripple and get a stable voltage for the sensors and PIC.

What am I missing?

Thanks for all the good ideas

Gordon Williams



----- Original Message -----
From: "peter green" <plugwash@P10Link.net>

> btw: you aren't going to drive a boost directly off an IO pin of a device
pic that is being powered by the boost so your going to need at least a
buffer stage.
>



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