Compact LiPo-powered pet collar health tracker using nRF52832 BLE, ECG, optical PPG, 6-axis motion sensing, and Quectel BG95 cellular/GNSS connectivity.

Small nRF52832 BLE wearable PCB for a clothes-hanger rail clip, targeting ~20×65 mm 2-layer JLCPCB production with LCSC-preferred parts.

Production-Ready 18×18 mm BLE Grip Sensor with nRF52832 RF Module, BMA456 IMU, CR2032 Power, and 2.4 GHz Antenna Keepout