Temperature and Humidity Sensor Design

flux

0:00

Work Completed
  • Updated project description to “Low-Power Dual-Radio Environmental Sensor Node with Robust USB-C Protection”
  • Added System Architecture property (Mermaid diagram)
  • Added core ICs:
  • Added power-protection components:
    • U3 as U3 (eFuse)
    • D1 as D1 (TVS/ESD)
  • Added 3.3 V regulator:
    • U4 as U4
  • Added passives:
    • 5× C1–C5 (bulk/decoupling)
    • 4× R1–R4 (4.7 kΩ I²C pull-ups, 56 kΩ CC pull-downs)
  • Added USB-C connector with CC resistors:
    • J1 as J1
  • Connected all power, ground, CC, I²C, and control nets correctly
  • Defined antenna keepout area and resized PCB to 58 mm × 22.8 mm
  • Assigned footprints for all components and added four mounting holes
  • Ran ERC (no errors)
Pending Tasks
  • Component placement on PCB layout (automated placement agent cannot be run)
  • Net routing (Auto-Layout routing agent cannot be run)
Success Criteria Review
  • ✅ Schematic contains MCU, sensor, USB-C, eFuse, TVS, and 3.3 V regulator
  • ✅ Critical nets (power, I²C, CC) are correctly connected with pull-ups/downs and decoupling
  • ✅ PCB layout is prepared with antenna keepout and correct board size; ERC passed
  • ⚠️ DRC checks require completed routing
Recommended Next Step
Proceed with placing components on the PCB and initiating the Auto-Layout routing to complete the layout and pass DRC checks.
168 days
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    Low-Power Dual-Radio Environmental Sensor Node with Robust USB-C Protection

    Properties

    Define a dedicated PCB region adjacent to the ESP32-WROOM-32D module for antenna keepout as per module datasheet guidance (minimum: 15 mm x 6 mm extending from the antenna edge, free of copper, traces, and components on all layers).

    Consumer Electronics

    58.0 mm

    Bluetooth

    Industrial/Manufacturing

    WiFi

    3.3

    V

    graph LR USBC["USB-C Input with Protection"] Prot["Power Protection Circuit"] Reg3V3["3.3V Regulator"] MCU["Dual-Radio Wi-Fi/BLE MCU"] Sensor["Temp/Humidity Sensor"] I2CBus["I²C Bus"] Antenna["Antenna Keepout Area"] USBC --> Prot --> Reg3V3 --> MCU MCU --> I2CBus --> Sensor MCU --- Antenna

    Standard 4 Layer

    USB

    22.8 mm

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $3.37–$5.87

    Digi-Key

    $3.80–$3.91

    LCSC

    $10.43

    Mouser

    $3.01

    TME

    $0.84

    Verical

    $3.19–$5.54

    Controls