USB Volume Control Knob

thingiverse

A simple USB volume control knob that you can press down to silence is easily crafted using a 5v Adafruit trinket, recognized by your PC as an HID device without requiring special drivers. The knob measures 50mm in diameter and 50mm tall. For a secure fit, I recommend using a 6mm split shaft encoder, such as this one on Amazon. Alternatively, you can use a D-shaft encoder like those sold by Adafruit, but the fit may be tricky. To create a stable base for the knob, fill it with BBs or other small heavy objects and secure them in place using epoxy, nail polish, or similar adhesives. I used acrylic conformal coating, which is thin and dries quickly. Additionally, an adhesive-backed rubber pad can be applied to the bottom of the base to prevent slipping. The trinket fits snugly within my prints, but a small spot of glue is used to ensure it remains in place. The top of the base is secured to the bottom using two 1/4" 4-40 screws; alternatively, you can use 6mm M3 screws. To install the code on the trinket, follow this guide from Adafruit: https://learn.adafruit.com/trinket-usb-volume-knob/overview