By Clewsy on 28 July 2016

This project began as an experiment when I inexplicably decided to learn how an optical rotary encoder worked (FYI, 2-bit gray code). It transformed into a learning experience around USB - specifically the HID protocol. Ultimately I ended up with a simple gadget that now sits on my desk and allows me to control the PC volume. A salvaged optical encoder was used to detect rotation along with a reclaimed head drum of a VCR which was repurposed as a control knob.