blished a “undershield” AA batter pack for Arduino.
They use a MAAX756 to boots 2 AA batteries up to a constant 5V to power an Arduino. The nice thing about this is that you can not only recharge the batteries, but if you are in a remote location you can simply swap them out.
You may ask why I’m not simply using 3 or 4 AA batteries to power the Arduino. The reason why, I’m not using batteries to drive my Arduino directly, is that they’re not regulated. Right after, you’ve recharged your battery, it may supply 1.4V, even though it’s rated for 1.2V, so there’s a risk of supplying your Arduino with too high or too low voltage.
Simple to put together and elegant = awesome!
Check it out on Instructables
via Hack a day
