Dr. Scott M. Baker made a custom controller for the Atari 5200 vintage gaming console, that is available on Github:
I decided to make my own Atari 5200 analog controller, using a sparkfun thumbstick together with ADC and digital pot to do the potentiometer scaling. The controller is aesthetically a bit rough, consisting of a pcboard mounted to a chunk of hardboard, but it’s fully functional. I also recommend Ben Heck’s “Atari 5200: Making a Better Controller” video.
Project info at smbaker.com.
Check out the video after the break.