Markus Gritsch made a nice USB volume control knob for his computer:
After having been inspired by this Instructable  I also wanted to make a nice looking volume knob to attach to my computer.
It uses the TrinketHidCombo library , but on a Digispark board, to have one more I/O pin which I use to drive a WS2812 LED ring. The code to bit bang the LEDs was taken from one of Josh’s excellent articles on WS2812 LEDs . I also experimented with other WS2812 libraries (NeoPixel, light_ws2812, FastLED), but they consumed either quite a lot of flash, or prevented the USB part from functioning.
Check out the video after the break.