I recently built a force feedback steering wheel from scratch, and used a 32u4 as the MCU. I started the project a few years years ago, but lost interest in favor of picking up 3D printing. It was a lot easier to finish now that I can make arbitrary 3D shapes. I ended up printing an inline 80:1 two stage gear reduction. Thankfully someone in 2020 implemented the HID PID stack for the 32u4. That dropped the firmware work from probably a month to only a few days. The AVR is a bit long in the tooth; I only get a few hundred loops per second while the USB stack is running. It's plenty fast enough for all the haptic effects to feel good, though. It helped to offload the quadrature decoding to a dedicated IC.
Years ago I made a control panel for Kerbal Space Program, and I used a V-USB based MCU to drive two analog voltage meters as fuel gauges. I also had an Arduino Uno in the control panel, but I used up every single IO pin on it doing a button matrix and LEDs. Enumerating the V-USB MCU is touchy, but once it's up it seems reliable enough to gamble Jeb's life with!
Years ago I made a control panel for Kerbal Space Program, and I used a V-USB based MCU to drive two analog voltage meters as fuel gauges. I also had an Arduino Uno in the control panel, but I used up every single IO pin on it doing a button matrix and LEDs. Enumerating the V-USB MCU is touchy, but once it's up it seems reliable enough to gamble Jeb's life with!