This is the arduino main board a.k.a Arduino Duemilanove (compatible). Arduino is an open-source physical computing platform based on a simple I/O board and a development environment that implements the Processing/Wiringlanguage. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The open-source IDE can be downloaded here for free (currently for Mac OS X, Windows, and Linux).

This new Arduino Duemilanove automatically selects the appropriate power supply (USB or external power). A great description of the new functionality can be found here (USB fuse protection, software reset, and much more!). Board comes fully assembled and tested with ATMega328 pre-loaded with bootloader. Please see the Arduino support forum for more information about this new board revision and bootloader.

Specification:

Documents and related links: 

• Arduino Home Page
• Duemilanove Features
• Getting Started
• Programming Reference
• Arduino Forum