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Based on the Tiny328, AAduino takes the platform to its sexiest form factor yet: Turning a three-AA battery holder with two batteries in it — the third battery compartment holds the AAduino ...

This Arduino-compatible board fits neatly into a AA battery slot. Kanflo opted for this form factor to create a self-contained radio node that supplies its own power.

You can also go the 9v battery route plugged into the on-board regulator of the Arduino but the low mAh rating of a 9v won’t allow your project to stay running for very long.