1. So far, I've been creating new .h elsewhere with NotePad and then adding it to my sketch folder via Sketch > Add File... which would more it to the correct place and make it visible as a tab. Is this really the best way?!
2. I'd like to share enum between two sketches (one is a transmitter, the other a receiver). How do I do this without duplicating the .h ? Creating a library seems overkill for a very specific enum.
3. Would I be better off combining both sketches and set a #define to choose whether to compile the transmitter or receiver?