epaper-102
by Nicell
20 parts · 20 × 39 mm
heypcb · Circuit World · Community board
Deadline Buddy — bar-exam countdown e-ink desk board
by Windy
A 75×55mm two-layer desk timer for students counting down to the big one — bar exam, autumn recruiting, thesis defense. ESP32-S3-MINI drives a 2.13-inch SPI e-paper; one big 12mm button cycles between deadlines; USB-C charges a single LiPo (BQ24074 power path) and a TPS63031 buck-boost supplies 3.3V; a MOSFET-switched buzzer chirps when the countdown hits zero. Drafted with heypcb AI — routing and verification in progress, display module still to be final-sourced. Entry for the HeyPCB Hardware C
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Write a note about this board- Board size
- 75 × 55 mm
- Parts
- 34 parts
- Nets
- 24 nets
- Licence
- CERN-OHL-S v2
Published Sep 29, 2026
Published snapshot
Stored error counts · DRC: 22 · ERC: 50
esp32e-paperusb-ccountdown
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