Temperature and Humidity Sensor Design

flux

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.

Flux stopped

U3
R2
Resistance
4.7kΩ
C1
Capacitance
10uF
U1 AGND - U2 GND
U4 VO - U1 3.3V
J1 CC2 - R4 P1
U4 VO - U1 3.3V
U1 AGND - U2 GND
J1 CC1 - R3 P1
U1 IO22 - U2 SCL
U1 AGND - U2 GND
R4 P2 - D1 G
R4 P2 - D1 G
J1 CC2 - R4 P1
C3
Capacitance
1uF
U1 AGND - U2 GND
C5
Capacitance
100nF
J1 VBUS4 - U3 IN_1
J1 GND4 - C1 P2
U3 IN_3 - U3 IN_4
U1 IO22 - U2 SCL
J1 VBUS4 - U3 IN_1
J1 GND4 - C1 P2
U3 OUT_5 - U4 VI
U4 VO - U1 3.3V
C5 P2 - R3 P2
U1 IO21 - U2 SDA
R3
Resistance
56kΩ
U1 IO21 - U2 SDA
R4 P2 - D1 G
J1 VBUS4 - U3 IN_1
U1 AGND - U2 GND
C5 P2 - R3 P2
C2
Capacitance
1uF
U1 IO21 - U2 SDA
R4
Resistance
56kΩ
C4
Capacitance
100nF
U1 IO22 - U2 SCL
U4 VO - U1 3.3V
J1 CC1 - R3 P1
R1
Resistance
4.7kΩ
U3 OUT_5 - U4 VI
U3 IN_3 - U3 IN_4
U1 AGND - U2 GND
J1
U4
Hole2
Hole4
U2
GND
Hole1
D1
Hole3
U1

No files yet

Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    No assets added.

    Anonymous Brown Scramble Suit

    Anonymous Brown Scramble Suit thumbnail
    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