Seems to be my week for asking questions about power!
After reading this thread about running the 5V/16Mhz Pro Mini @ 3.3V:http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1236970695
I've tried it myself and it seems to be working OK...but as those in the thread who have tried to essentially "overclock" their 16Mhz mini (this is the 328 chip, FYI)...all is good at room temperature. Well, we've had some hot days here in the valleys of Los Angeles and my data isn't looking so good. Could be other issues, but I'm thinking it's time to revisit the overclocking issue. The only reason I need to have 3.3V is to power an xbee in the same system. There is also a compass in the system that can tolerate 3-6V.
So my two questions:
1. would there be an issue powering the minis and compass with 5V and the xbee with 3.3V in the same system (and assuming a common/shared ground)?
2. is there a simple, uber-compact method for converting 5V to 3.3V, or a way to have the mini provide 3.3V given a 5V source?
I know the easy answer would be to use a 3.3V/8Mhz Pro Mini, but I'm sitting on 20 of the 16Mhz for this project (in order to work with an earlier version of newsoftserial), and would rather not purchase any more for while!
Thanks for any advice!