If you want rotary encoders and OLED screens to show what ... an electromechanical buddy for his keyboard that works as a volume control. Now that we don’t rely on them to make phone calls ...

They're often relegated to media volume control on a DAC or an audio amplifier for adjusting levels, but current-day firmware for custom mechanical keyboards also provisions for rotary encoders ...

If you need to change another volume, just click it again ... case you’ll find the usual suspects — Arduino Nano, rotary encoder, an OLED display, and an LED ring, each with their own place ...