Arduino Serial USB Board
From bildr
Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language.
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 for free (currently for Mac OS X, Windows, and Linux).
Availability
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