Description of prototype
The design consists of two single-layer PCBs, soldered together with a gap. The final board is anticipated to be a single two-layer board (may be more layers if I can squeeze more functionality out of it).
The board size is 97mm wide by 64mm tall. It uses USB for power, but can theoretically be driven by a battery pack. I would like to have a recharging circuit in there if possible.
Top board - UI board
Bottom board - main board
Yes, there have been some board modifications to fix problems I hadn't forseen, and yes, they are held with blue-tack. The PCB designs have already been back-ported with the changes.