The light dimmer knob of my father in law was broken, so I made him a new one! If you are in need of a dimmer knob too, you might try this one.

I wanted to build a dedicated, distraction-free focus timer on my desk. The design philosophy is intentionally minimalist: one button does everything. Press it to wake up, press again to cycle through duration options, and it automatically starts counting down. When you're in the zone, the big display shows remaining minutes at a glance without pulling you out of focus. I revisited an old Arduino project and made a '2026 edition', with with modern microcontroller and self-made enclosure.