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[on:]

I have the openlog http://www.sparkfun.com/products/9530 connected to the arduino pro mini and it works perfectly when powered by the laptop through the FTDI basic. However, when I have them powered by 3.3V battery no data is logged in the openlog. Anyone know what the problem is?

[Reply #1 on:]

http://arduino.cc/en/Main/ArduinoBoardProMini

Input Voltage   3.35 -12 V (3.3V model) or 5 - 12 V (5V model)

You didn't say which model you have, but a 3.3V battery does not seem to be enough when the minimum is 3,35V.

[Reply #2 on:]

Its the 3.3V model. If I was to use up to 12V would I need to use a voltage regulator? Would I risk burning out the components?

[Reply #3 on:]

You can supply up to 12 volts to the on-board voltage regulator. It will get warm at 12 volts. If you were to power the Arduino with 2 of your 3,3V batteries, that would be better.

[Reply #4 on:]

So if I was to supply up to 12V to the raw on the arduino would that work? would using a lithium battery supply more current?

[Reply #5 on:]

So if I was to supply up to 12V to the raw on the arduino would that work?

Yes.

would using a lithium battery supply more current?

Than what? A potato?

[Reply #6 on:]

I have them powered by 3.3V battery

would a lithium battery supply more than a 3.3V battery?