Thumb wheel board
This is daughter board that hosts thumb wheel, 2 thumb buttons, and 2 externally connected buttons with wires. It connects to the other button board via 12pin ribbon cable.
There are 2 ICs:
- SOT-23-6 with markings 228ATV that appears to be voltage regulator
- BGA with markings 157 T826 that likely is BMM150 magnetic sensor
It would be quite hard to solder any breakout wires to the small board, but another board with buttons has a lot of test points that hopefully can be used instead.
Next step would be to figure out ribbon cable pinout, and connect wires to button board.
Plan is to use raspterry pi pico for prototyping.
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