This is just brilliant, can't wait till you get these back in stock!
One thing I've been wondering about is the possibility of adding some non-linear mapping options that emulate the behavior of modern analogue controllers ps/xbox etc. particularly to make n64 shooters more controllable on these sticks.
I think the reason shooters like GE/PD feel twitchy on these modern analogue sticks is due to the controller/most games not taking advantage of any exponential curve to map the inputs.
*I may be completely wrong calling it exponential mapping but that's what I know from RC radios where the function of adding a more gradual input curve near the deadzone is called "expo"
The original n64 stick has what feels like some hardware expo built in since it's very easy to find the end of the deadzone and it has a precise resistance that's proportional to the amount of stick input. That combination makes small /precise inputs relatively easy. Playing n64 games/shooters on more modern analogues with linear mapping means making small movements is trickier especially near the higher resistance deadzone, I always feel like there's a "hump" of resistance right at the start of the movement which is annoying.
The hori minipad works better than others on n64 I think because the overall resistance on the stick is very light so that initial hump and deadzone imprecision is less noticeable, but I believe the mapping is still linear and I would bet a nonlinear mapping could help even there.
So my question is this... with a custom coded Atmel on one of these pcbs it should be possible to write some software into the controller itself to add some more gradual input mapping/expo right?
Have you considered doing something like this if it's possible, that would be very interesting to me!
Granted I haven't tried one of these pcb and your current firmware yet so maybe the issue is already solved with your calibration approach but if not I'd be interested in your comments.