USB-C Temperature and Humidity Sensor Node Design

flux

I’m blocked from making project changes right now because execution credits are exhausted, so I have not added or wired any components in the schematic yet. The project is still empty: 0 components and 0 nets.
Recommended design direction for your USB-C Wi‑Fi/BLE temperature/humidity node:
  • MCU / radio: ESP32‑C6 or ESP32‑S3 module/class device for 2.4 GHz Wi‑Fi b/g/n plus BLE 5.x. ESP32‑C6 is a strong low-power/default choice if Wi‑Fi 6 support is acceptable in addition to b/g/n compatibility.
  • Sensor: digital I²C temperature/RH sensor such as Sensirion SHT40/SHT41/SHT45 or TI HDC302x.
  • Power input: USB‑C receptacle configured as a 5 V sink using CC pull-down resistors.
  • Input protection: USB VBUS protection path with reverse-current blocking, over-voltage protection, under-voltage lockout, and over-current protection sized for 0.5–3 A USB sources.
  • Regulation: protected 5 V input to a high-efficiency 3.3 V regulator sized for Wi‑Fi TX current bursts, with datasheet-required input/output capacitors.
  • RF / consumer product details: module antenna keepout, ESD protection on USB, low-noise sensor placement away from regulator/MCU heat, test points, and regulatory documentation for FCC/CE pre-scan planning.
What remains to be done once execution is available:
  1. Rename the draft project and create a project specification.
  2. Select exact parts from the Flux library.
  3. Calculate the power budget before selecting USB protection, regulator, and current-limit parts.
  4. Add MCU/radio module, T/RH sensor, USB‑C connector, protection ICs, regulator, passives, programming/test points, and mounting hardware.
  5. Wire the schematic per datasheets, including decoupling, pull-ups, boot/programming pins, USB‑C CC resistors, ESD/protection, and sensor I²C.
  6. Run schematic review/ERC and fix all unresolved violations.
  7. Create bring-up, firmware pin map, and regulatory planning documents.
  8. After schematic is clean, ask for your approval before moving to PCB layout.
Create project spec
Select exact parts
Calculate power budget
Choose core parts
Plan schematic connections
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Solar Purple Liquid Breathing Apparatus

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