I have a circuit all hooked up with a Pro Mini and accelerometer using a MicroSD breakout board (http://www.sparkfun.com/products/544
) to record data using the SD.h library. Everything was working fine up until everything was soldered together, and also worked testing the circuit on an Uno. Now I'm beginning to suspect (probably correctly) that the board isn't recognizing the SD hookup because it's a 3.3v and my Pro Mini is a 5v board.
So two questions..
1) What's the best way to fix this?
2) Why would it have worked fine when it was hooked up before and during testing on my Uno?