We are now a long way since the start but we are making progress.
We swapped the handmade controller handle for a ready to buy version.
The potentiometer who was giving eratic values during testing is replaced by a linear hall sensor and a 10x10x4 mm neodyne magnet.
The 6 six buttons for 3 selectable main functions up and down now have 4 neighbour buttons which control the menu navigation.
The cable to the Mega is a ripped USB cable with "+", "-" and the analog values wires for the hall sensor and the menubuttons which work on an analog port too.
In the picture all looks to be connected but the Mega the display and the button board are mechanical seperated still.
More to come.