The Arduino IDE supports multiple files by adding more tabs. If you use INO files you’re only adding one at a time, but if you use C/C++ header and source files it’s two at time.

Because everything is moving to a web app, [Vasilis Georgitzikis], a.k.a. [tzikis] developed codebender, a cloud-based Arduino IDE replete with built-in libraries, documentation, and the ability to… ...