[BjornW]

For those interested, Kanflo wasn't the first to create an Arduino like clone in this form factor. For instance there is the the Jeenode and its sibblings developed by Jean-Claude Wippler.

See for more info on this: http://www.digitalsmarties.net/products/JeeNode

[anotheryou]

The JeeNode is way bigger than an AA (with the upper pins bent outwards nearly double the size).

I recently bought teensys (or teensies?) to get smaller (a little to wide for AA slots though): https://www.pjrc.com/teensy/teensyLC.html Given the cost you might want to try to sand of one side of connectors to make it fit :)