900 Degree Racing Wheel Controller

I added four more buttons (2-position non-fixable toggle switches) and planned to add four more (12 looks like is a limitation of this Arduino build). I'm still experimenting with the buttons, but now I can suggest getting the softest ones.

As the encoder, I used GTech LPD3806-600BM-G5-24C, and it worked well.

Also, I have to add a stopper to the bottom of the wheel to prevent the center from being lost during excessive wheel rotation. 360 degrees is playable in most games; I plan to print another wheel without the stopper for Euro Truck, where a 1080-degree angle may be handy.

FYI, it's playable with MudRunner and Snowrunner via Steam controller (including the joystick for the camera rotation). It took several iterations to figure it out, but the result is okay.