Temperature and Humidity Sensor Node Design

flux

I haven’t been able to modify the project yet in this session, so the project is still empty: no schematic, no components, and no wiring have been created.
What remains to be done for your sensor node:
  • Define the architecture:
    • USB-C 5 V input, sink-only default current behavior
    • Input protection chain with reverse protection, OVP, UVLO, and OCP sized for 0.5–3 A source planning
    • Efficient 3.3 V rail for logic/radio
    • Low-power Wi‑Fi + BLE MCU
    • Digital temperature/humidity sensor
    • Status/programming/debug interfaces as needed
  • Select exact parts from datasheets:
    • Likely an ESP32-class low-power dual-radio MCU
    • A low-power digital T/RH sensor
    • USB-C receptacle and CC resistors
    • Protection / power-path ICs and regulator
  • Build the schematic:
    • Add all components
    • Wire each IC per recommended application circuits
    • Add all decoupling, pull-ups, boot/enable support, and protection parts
  • Validate:
    • Check power tree and current capability
    • Run schematic review and fix violations
    • Confirm readiness before moving to layout
Recommended implementation direction once work can continue:
  • MCU: low-power ESP32 variant with 2.4 GHz Wi‑Fi b/g/n + BLE 5.x
  • Sensor: digital I2C temperature/humidity sensor
  • Power path: USB-C 5 V sink-only front end with CC resistors, fuse/current limiting, TVS, reverse blocking, OVP/UVLO switch, then 3.3 V regulation
  • Consumer-use considerations: ESD protection on USB, solid decoupling, conservative protection thresholds, and clean RF/layout planning
If you want, I can next turn this into a concrete parts-and-block-level schematic plan for manual implementation.
Create schematic plan
Select key parts
Design USB-C protection
Save requirements note
Find ESP32 variant
No schematic yet

Talk to Flux to get started.

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