Using some polyfill stuffing and a basic Arduino circuit, Instructables user "dablondeemu" created a project for a class which is incredibly simply - yet visually stunning. It's simply an Arduino controlling a variety of LEDs, and with the use of an infra-red receiver it can be controlled remotely (for example, from a ceiling). This would be a great project to share with younger people or introduce someone to the world of Arduino:
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