Arduino Nano is a compact board similar to the UNO
The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328P (Arduino Nano 3.x). It has more or less the same functionality of the Arduino 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.
Microcontroller module with USB connection
30 pin module, breadboard mountable
Specialized library functions for robotics
It is intended for roboticists, artists, designers and hobbyists
