Using Ruby to Program Arduino | Envato Tuts+Through this article you will learn how we can go on to build a project where the LED goes RED if anyone tweets with a :-( (sad face) and the word rain, and it goes GREEN when the tweet contains a :-) (happy face) and the word rain! Physical computing refers to the idea of programming things around you. Unlike typical programming for files, data, or the Internet, this is programming for things you
