This is pretty cool. First I was wondering what for, but its great for their use case (embedded devices). Why not use a language for the web interface the developer is familiar with.<p>Unfortunately, they're a bit late. Nowadays it would probably be cooler to use JS, if language popularity is the focus. Or maybe python.<p>(Aside: I learned web development in the good old LAMP times. My silly gut feeling is still that PHP is pretty fast and flexible compared to Python which seems slow (on the server), and JS which is way too slow and fragile. I know it's completely backwards nowadays, but funny how what you've learned sticks. When I hear "JS on a Arduino" I always think "yeah sure....", but it's actually a clever idea, just like this.)