This great blog-tip was sent to us by Mitch B:
“Turny” is a custom-built alternative bluetooth video game
controller I designed and built that uses four colour coded rotational
knobs. It uses the Adafruit Bluefruit M0 Featherboard internally. I designed
a game for it (titled “Transmission: defence” during Global Game Jam 2018
that uses the knobs to control the frequency and range of defending pulses
in a “missile-command”-like scenario.
You can head over to Random Project Lab for full details and files.