4 layers36 × 36 mm

JRWatch
jadenrhee/JRWatch
Low-power BLE wearable: nRF52840 module + nPM1300 PMIC + BMI270 IMU + Sharp MIP display. 36 mm 4-layer board, ~15 µA projected sleep current, Zephyr firmware.
47 parts2
Open-source boards designed in KiCad by jadenrhee on GitHub, from 2 repositories. A board’s address here is its repository’s there.

jadenrhee/JRWatch
Low-power BLE wearable: nRF52840 module + nPM1300 PMIC + BMI270 IMU + Sharp MIP display. 36 mm 4-layer board, ~15 µA projected sleep current, Zephyr firmware.

jadenrhee/wigglecam-controller
RP2040 co-processor board for a 4-lens wigglegram camera: constant-current flash, controls, battery telemetry, Pi 5 I2C interface. 4-layer, DRC-clean, fab-ready.