12V LiFePO4 power distribution board requirements package: 150 mm x 100 mm 2-layer SMD PCB with 12V battery input, input protection, 12V-to-5.1V buck conversion, six USB-C power outputs, 3.3V logic rail, current/voltage monitoring, test points, board-edge connectors, and JLCPCB-aligned fabrication outputs.

Raspberry Pi 5 HAT with 12V DC input protection, 12V-to-5V buck regulation, 40-pin GPIO header, MPU6050 I2C header, NEO-8M UART header, and GPIO status LED.

2-layer mezzanine HAT for LILYGO T-SIM7600G-H R2 adding dual CAN, protected 12V-to-5V power, and vehicle connector interface.

WT32-ETH01 carrier refactored for a single 2x10 WT32 header, 12V input terminal, 6-pin Wiegand terminal, and a 12V-to-5V buck stage with level-shifted D0/D1 plus transistor-driven LED and BUZZER outputs, prepared for a simple 2-layer layout.

WT32-ETH01 carrier refactored for a single 2x10 WT32 header, 12V input terminal, 6-pin Wiegand terminal, and a 12V-to-5V buck stage with level-shifted D0/D1 plus transistor-driven LED and BUZZER outputs, prepared for a simple 2-layer layout.