Edit Here is the blog post from the person who created it: http://johan.kanflo.com/the-aaduino/

Github repo (Its MIT licensed): https://github.com/kanflo/aaduino

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What I really liked about this approach is that it makes packaging the "Arduino" inside a common battery holder very easy. Maybe one or two holes are needed to connect sensors and you have a pretty nifty enclosed "Arduino". What we now need is someone to build a battery enclosure with exposed poins. Anyone from Adafruit, Tindie, etc. here? :)