Temperature and Humidity Sensor Node Design

flux

I haven’t modified the project yet in this session. The project is still effectively empty, so the work remaining is the full design.
Planned design scope for your node:
  • USB-C 5 V sink input using default current advertisement
  • Input protection stage covering reverse protection, OVP, UVLO, and OCP, sized for 0.5–3 A source capability
  • Ultra-low-power Wi‑Fi + Bluetooth MCU, likely an ESP32-class low-power device with 2.4 GHz 802.11 b/g/n + BLE 5.x
  • Digital temperature/humidity sensor
  • 3.3 V power tree with regulator and datasheet-required passives
  • Proper decoupling, boot/config resistors, programming/debug access, and consumer-oriented connector/protection details
What remains to be done:
  1. Select the exact MCU and T/RH sensor from datasheets.
  2. Do a power budget and size the USB-C power-path and 3.3 V regulator correctly.
  3. Capture the complete schematic, including USB-C CC resistors, protection ICs/FETs, regulator, MCU support circuitry, and sensor wiring.
  4. Verify all ICs against datasheet reference circuits.
  5. Run electrical review and clear all violations.
  6. Then, after your confirmation, move to PCB layout.
Recommended architecture:
  • MCU: ESP32-C6-MINI-1 or ESP32-C3-MINI-1 depending whether you want BLE 5.x plus Wi‑Fi with strongest low-power ecosystem preference; C6 gives newer radio support, C3 is simpler and mature.
  • Sensor: Sensirion SHT41 or TI HDC3020 for low-power digital T/RH sensing.
  • Power: USB-C receptacle as 5 V sink only, CC1/CC2 5.1 kΩ Rd, followed by dedicated 5 V protection/power-path stage, then a low-Iq 3.3 V regulator.
  • Protection: eFuse / protection controller preferred over discrete-only approach for consumer robustness.
Since I’m blocked from executing changes right now, the next step is for me to build the schematic around one of these two directions:
  • Conservative/mature: ESP32-C3 + SHT41
  • Newer platform: ESP32-C6 + SHT41
If you want, I can proceed with the conservative ESP32-C3 + SHT41 architecture as the default when execution is available again.
Use ESP32-C3
Use ESP32-C6
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Yearling Lavender Liquid Breathing Apparatus

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