This is a wonderful little piece of information. Thank you. I had the crazy idea a while back about stuffing a micro-controller, temp+humidity sensor, piezo sp

This is a wonderful little piece of information. Thank you. I had the crazy idea a while back about stuffing a micro-controller, temp+humidity sensor, piezo speaker into my guitar case to let me know if the Humidity got out-of-band but I couldn't see how to get this to run for more than a few days with out having a gian5t battery pack or having to plug it in to the wall. Now I know, and knowing is half the battle.