- Rotate knob to raise/lower volume
- Press knob to mute/unmute sound
- ATmega32U4 board (Arduino Leonardo compatible)
- KY-040 Rotary Encoder
- Some wires and a breadboard
All sourced from aliexpress, total cost somewhere around 5 euros.
Pin names are based on what's physically written on the boards
| ATmega32U4 | KY-040 |
|---|---|
| D11 | CLK |
| D9 | DT |
| D10 | SW |
| 5v | + |
| GND | GND |
(no pretty schematic because such tools do not exist)
In breadboard
Final version embedded in a plastic buckle