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Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

About Arduino

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

Arduino can sense the environment by receiving input from a variety of sensors and can affect its surroundings by controlling lights, motors, and other actuators. Perfect for home appliances, prototyping, robotics, and more. The microcontroller on the board is programmed using the Arduino programming language (based on Wiring) and the Arduino development environment (based on Processing). Arduino projects can be stand-alone or they can communicate with software running on a computer (e.g. Flash, Processing, MaxMSP).

(This text based on the summary at www.arduino.cc)

Related tags: atmegaavrlilypadmicrocontroller