1100GPS power control
- Oct 9, 2006I think I'm going to do a small run of another board revision to test out a
few ideas, including the motion sensor. I'm also looking at adding another
switch to control power to the GPS receiver. Another VN820 would be
overkill, though - it shouldn't really have to drive more than about 100 mA.
I'm thinking a PNP transistor as a high side switch might do it. Some of
the MCU I/O pins can sink up to 25 mA, should be fine even with a low Hfe.
Hmm.. maybe that's not such a good idea if there's a possibility that it
might need to switch 12 volts for GPS power. But then, maybe it's not worth
supporting 12 volt GPS power control anyway. Getting a little too tired
tonight to think clearly on this.
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