Temperature and Humidity Sensor Node Design

flux

I’m blocked from executing project changes right now because the session has no remaining execution credits. No schematic components, wiring, datasheet checks, or layout work were completed in this session.
Current project state:
  • Empty project
  • 0 components
  • 0 nets
  • Placeholder project name/description still unchanged
What remains to be done:
  1. Rename and document the project as a USB-C powered Wi-Fi/BLE temperature and humidity sensor node.
  2. Select the dual-radio MCU/module, likely an ESP32-C6 / ESP32-S3 / ESP32-C3-class module depending on BLE 5.x and power goals.
  3. Select a digital temperature/RH sensor, preferably I²C, low-power, factory calibrated.
  4. Design the USB-C 5 V input stage:
    • USB-C receptacle with CC pull-downs for default 5 V sink behavior
    • Reverse protection
    • OVP
    • UVLO
    • OCP / current limiting or eFuse
    • Support for 0.5–3 A capable USB-C sources
  5. Add regulated power rails, likely 3.3 V for MCU and sensor.
  6. Add required decoupling, pull-ups, boot straps, EN/reset circuitry, programming/debug access, and RF antenna keepout.
  7. Verify all ICs against datasheet-recommended application circuits.
  8. Run schematic review/ERC and fix violations.
  9. After schematic validation, proceed to PCB placement with user confirmation, then routing after placement approval.
Recommended architecture when work resumes:
  • USB-C receptacle → protected 5 V power path/eFuse → 3.3 V regulator → ESP32-class Wi-Fi/BLE MCU module + low-power I²C T/RH sensor.
  • Use a pre-certified RF module to improve consumer-product viability and reduce RF certification risk.
  • Use an integrated USB power protection/eFuse device for OVP/UVLO/OCP rather than discrete protection where possible.
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