Temperature and Humidity Sensor Design

flux

0:00

Work done
  • Set project name and description for the USB-C WiFi/BLE environmental sensor node.
  • Created the Project Specification project file.
  • Selected and added the main schematic components: ESP32-C3-MINI-1-N4 MCU/radio, SHT40 T/RH sensor, USB-C receptacle, NCP361 input protection, TLV75533 3.3V LDO, TVS diode, CC/I2C/boot resistors, regulator/decoupling capacitors, reset/boot buttons, and UART header.
  • Wired the core schematic: USB-C VBUS, CC1/CC2 sink pull-downs, protected 5V rail, 3.3V rail, ESP32-C3 power/ground, SHT40 I2C bus with pull-ups, USB D+/D- to ESP32-C3 native USB pins, reset/boot circuits, and UART programming header.
  • Fixed ESP32-C3 module ground-pad connectivity.
  • Set up the PCB as a 50 mm x 100 mm, 4-layer board and placed components with USB-C at the edge, radio antenna at the board edge, sensor at an exposed edge, and power circuitry in a short path.
Success criteria review
  • ✅ Component selections meet the main functional intent: low-power WiFi/BLE MCU, digital T/RH sensor, USB-C 5V input, input protection, and 3.3V regulation.
  • ✅ Schematic integration is substantially complete for power, sensing, USB-C sink configuration, programming/reset/boot, and MCU-sensor connectivity.
  • ✅ PCB layout planning/placement was started with antenna, sensor exposure, USB-C edge placement, and power-path flow in mind.
  • ❌ Unable to finish final validation and cleanup because execution credits are exhausted.
Remaining work
  • Run a final ERC/DRC pass and resolve any remaining warnings.
  • Confirm NCP361 UVLO behavior and trip thresholds against the datasheet; if strict adjustable UVLO is required, consider replacing it with a fuller-featured eFuse.
  • Add or confirm production MPNs for generic passives before manufacturing.
  • Configure detailed trace-width/clearance rules, especially USB D+/D-, VBUS/5V power, and 3.3V rails.
  • Route the PCB and then re-check for airwires/clearance issues.
6h
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Project Specification
Design Summary
Status: Draft / Review / Approved
Manufacturing target: Prototype / EVT / DVT / PVT / Production
Software / firmware: repository link
Scope
Purpose
In scope
Out of scope
System context
Requirements
Functional
Electrical
Mechanical / environmental
Key constraints
Dependencies and risks
Dependencies
Key risks
Validation
Success criteria
Planned checks
Release-facing notes
Expected deliverables
Special release notes
Change notes / open questions
Changes in this revision
Open questions

    Design Summary

    Scope

    System context

    Requirements

    Functional

    Electrical

    Mechanical / environmental

    Key constraints

    Dependencies and risks

    Validation

    Release-facing notes

    Change notes / open questions

Documents

    Project Specification

Assets

No assets added.

USB-C WiFi BLE Environmental Sensor

USB-C WiFi BLE Environmental Sensor thumbnail
Consumer USB-C powered environmental sensor node with protected 5V input, 3.3V regulation, WiFi/BLE MCU, and digital temperature/humidity sensing.

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