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From https://www.arduino.cc/:
Arduino is an open-source electronics platform based on easy-to-use hardware and software. It's intended for anyone making interactive projects.
Some versions of the amazing Drancel (R,G,B) light synthesis system are driven by Arduino. See it in action here!
Webel IT Australia also uses the wonderful Arduino system as an educational example of applications of Systems Modeling Language v1 (SysML®).