Arcade Spinner

I made this spinner control for my MAME arcade cabinet. It functions as a USB mouse and can be assigned as a spinner control in MAME for games such as Tempest or Major Havoc.

In addition to the 3D printed part you will you will need:

1. Incremental Rotary Encoder (should be less than $20 on Amazon)
2. Arduino with ATmega32u4
3. Stereo volume knob of your choice that fits your encoder shaft

You can use a low cost plastic knob, 3D print your own, or use a solid aluminum one for some mass. It is made to mount into a MDF arcade control panel. Drill a 38mm hole and this part drops in and has a 2mm flange to keep it from falling though. This is covered by your control knob. The encoder mounts from underneath, your encoder should come with machined mounting holes that line up with the holes in this part.

To program the ATmega32u4 as a mouse use the Arduino IDE and install the built in mouse library and the encoder library (in the comments) with the following sketch:

#includ