USB-C Temperature Humidity Sensor Node Design
Worked for 1 min 48 sec
I found suitable core parts: ESP32‑C3 module for Wi‑Fi/BLE 5, Sensirion SHT40 T/RH sensor, USB‑C receptacle, TPS25947 eFuse for OVP/UVLO/OCP/reverse blocking, HUSB238A for Type‑C source-current/PD awareness, and AP2112K 3.3 V LDO.
Worked for 8 mins 15 sec
I’m blocked because the project has no available ACUs, so I can’t continue executing design actions or run validation.
Completed so far:
- Renamed the project to USB-C WiFi BLE Sensor Node and updated its description/properties.
- Selected and added the main schematic parts:
- ESP32-C3-MINI-1-N4 Wi‑Fi/BLE module
- Sensirion SHT40 T/RH sensor
- USB-C receptacle
- TPS259474 eFuse for OVP/UVLO/OCP/reverse-current blocking
- AP2112K-3.3 600 mA LDO
- HUSB238A USB-C/PD sink/current-detection controller
- USB ESD protection, reset/boot switches, status LED, and support passives
- Consulted datasheets for ESP32-C3, SHT40, and AP2112K:
- ESP32-C3 needs 3.0–3.6 V, ≥0.5 A supply capability, EN not floating, GPIO9 boot pull-up, GPIO18/19 as USB D−/D+.
- SHT40 runs from 1.08–3.6 V, I2C address 0x44, needs I2C pull-ups and local decoupling.
- AP2112K uses 1 µF min input/output capacitors, EN high for normal operation.
Remaining work:
- Finish datasheet checks for TPS259474, HUSB238A, USB-C connector, and USBLC6 ESD part.
- Correct individual passive values/properties where needed.
- Wire the full schematic: USB-C, CC/PD controller, eFuse, 3.3 V rail, ESP32, SHT40, I2C, USB data, reset/boot, LED.
- Run schematic review/ERC and fix violations.
- Create the required project files: project specification, power budget, firmware starter, FCC/CE regulatory notes, and board bring-up plan.
Check power ICs
Wire schematic
Run review
Power budget doc
Compliance docs
