Arduino playground wiki

Description
An Arduino is a single-board  and  for programming it. Arduino is designed to be easy to use and extend -- it was originally designed for artists and others unfamiliar with software development, to control student-built interaction design projects. The PCB , the host development software, and the  bootloader have all been released under  licenses.

The Arduino Playground is "a wiki where all the users of Arduino can contribute and benefit from their collective research. This is the place to post and share your own code, circuit diagrams, tutorials,  instructions, tips and tricks, and after all the hard work, to show off your projects!"

Related wiki:
 * AVRFreaks wiki -- each Arduino uses an Atmel AVR 
 * RepRap wiki -- uses Arduino
 * Gasifier Experimenters Kit wiki -- uses Arduino
 * Open Circuits -- discusses Arduino and many other open hardware devices
 * AdaWiki -- often discusses the Arduino
 * EcoModder wiki -- uses the Arduino platform to measure miles per gallon
 * MakerBot Wiki -- uses Arduino
 * eLinux.org Wiki -- discusses alternatives to Arduino: embedded CPU boards that are faster but more difficult to use than Arduino, such as
 * Gumstix users wiki
 * BeagleBoard wiki