Hey r/PrintedCircuitBoard,
First-time PCB designer here. Would love a schematic review before I start routing.
What it is: A wearable shoulder-mounted posture tracker. Detects slouching via MPU-6050 IMU, alerts via haptic (DRV2605L + LRA) and audio (MAX98357A + 8Ω speaker). Charged over USB-C, runs on a 350mAh LiPo.
Key ICs:
- MCU: ESP32-S3-MINI-1 (native USB, BLE)
- Charger: MCP73831 @ 100mA
- LDO: AP2112K-3.3
- ESD: USBLC6-2SC6 on USB D+/D-
- Board target: 45×35mm, 2-layer, JLCPCB
What I'm most unsure about:
- Power path: USB → polyfuse → MCP73831 → LiPo → AP2112K → 3.3V rail
- ESD protection placement on USB D+/D-
- DRV2605L EN pin pull-up + HAPTIC_EN net (GPIO5)
- Anything I missed before I start routing
ERC: 0 errors. All footprints assigned. Happy to share KiCad files if helpful.
Thanks!
Schematic :
u/Fun_Koala_5938 — 12 days ago