What about using a MFI iOS controller (bluetooth video game controller) to send commands to the Raspberry Pi? It could also hold the phone to show the Cab3 app. I understand that there may be (a lot of) additional code to incorporate something like this. However, the gaming controllers are inexpensive, durable, allow a wide range of input types, and can navigate menus and data input rather quickly even without a number pad. Food for thought for Dave and others in the trenches on this project. Thanks for making everything public, Dave. Very fun and exciting stuff.
