Schematic wiring is complete and I created firmware, bring-up, and regulatory files. I’m running ERC/DRC-style checks now and will fix real electrical issues; any remaining schematic-geometry warnings will be called out separately.

Implemented the schematic for the USB-C powered Wi‑Fi/BLE temperature/humidity node. It uses a SiWG917 Wi‑Fi/BLE 5.4 module, SHT41 T/RH sensor, USB-C sink input, TPS25940 true reverse-blocking eFuse with OVP/UVLO/OCP/soft-start, MP28301 3.3 V buck regulator, ESD protection, reset/ISP/SWD debug, I2C pull-ups, and status LED. Created project files: - [Project Specification](https://www.flux.ai/:handle/:documentSlug/files/project-specification-usb-c-wifi-ble-th-sensor~il) - [Firmware Starter](https://www.flux.ai/:handle/:documentSlug/files/firmware-starter-siwg917-usb-c-wifible-trh-sensor~11) - [Board Bring-Up Plan](https://www.flux.ai/:handle/:documentSlug/files/board-bring-up-plan-usb-c-wifi-ble-th-sensor~7w) - [Technical Construction File](https://www.flux.ai/:handle/:documentSlug/files/technical-construction-file-usb-c-wifi-ble-th-sensor~fv) Open items: - PCB layout/routing is not done yet, so airwire DRC errors are expected. - Generic passives still need final manufacturer MPNs before manufacturing export. - Layout must enforce the SiWG917 antenna keepout and thermal isolation around the SHT41. Suggested next steps: 1. Set board size/stackup and move into PCB placement. 2. Place U1 at the board edge with antenna keepout and U4 away from heat sources. 3. Route power, buck, I2C, SWD/UART, and USB-C protection paths. 4. Assign final passive MPNs and run full DRC/manufacturing checks.