Digital Watch V1

A see-through, build-it-yourself wrist watch made as a gift for STEM teachers. An ESP32-C3 SuperMini drives a four-digit seven-segment display that dims itself, an RGB LED and a vibration motor inside a clear 3D-printed case, keeps time with a DS3231 clock chip and corrects it over Wi-Fi. Beyond the clock it has classroom tools: a stopwatch, countdown timer, tally counter, dice, metronome and a bell schedule that counts down to the next bell. Plug-in packs add abilities through an accessory socket on the face, such as a temperature, humidity and pressure logger whose samples download as a spreadsheet, or an instrument tuner. Watches in the same group can see and buzz each other and share the time over ESP-NOW with no router. Each owner sets theirs up with Watch Studio, a 0.1 MB desktop app for Windows and macOS, choosing screens, bells and custom apps such as step timers and name pickers. The circuit is generated from a Python script into KiCad and passes its electrical rules check, all 49 parts are placed, and the firmware compiles; the board is not routed yet and the firmware has not run on hardware.

November 2026