I’m blocked from modifying the project right now because execution credits are exhausted, so I could not add components, wire the schematic, or run validation.
Requested design scope captured:
USB-C powered 5 V environmental sensor node
Wi-Fi + Bluetooth dual-radio MCU, 2.4 GHz 802.11 b/g/n plus BLE 5.x
Digital temperature/humidity sensor
Consumer-use power input protection: reverse protection, OVP, UVLO, OCP
USB-C default 5 V sink behavior, planned for 0.5–3 A capable sources
Low-power architecture
Recommended next implementation plan once execution is available:
Rename the draft project and create a concise project specification.
Select a suitable low-power Wi-Fi/BLE MCU module, likely an ESP32-C3/C6/S3 module depending on GPIO, USB, and power targets.
Select a digital T/RH sensor such as SHT40/SHT41/SHTC3-class I2C sensor.
Design USB-C 5 V input with CC pulldowns, ESD protection, current limiting/eFuse or power-path protection with OVP/UVLO/OCP, and reverse-current blocking.
Add 3.3 V regulation sized from a full power budget, including Wi-Fi TX current peaks.
Wire MCU boot/reset/programming, decoupling, antenna keepout guidance, I2C pullups, sensor decoupling, and status/debug headers as appropriate.
Run schematic review/ERC and fix all violations before moving to layout.
After schematic approval, proceed to PCB placement with RF antenna keepout, USB-C edge placement, short protected power path, and local decoupling.