The Iduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (iduino Nano 3.0) or ATmega168 (iduino Nano 2.x). It has more or less the same functionality of the iduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one.
Schematic and Design:
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