Stock filament counters aren’t always very accurate, but you can roll your own filament counter from an old mouse. [Bin Sun]’s build is based around an old ball-type PS/2 mouse, the kind with ...

To send the click events, [Jacek] baked some mouse buttons into the keyboard’s firmware. Among the other Feather sensors is a PDM MEMS microphone, so detecting taps on the ball and translating ...