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
C1
Capacitance
10uF
C3
Capacitance
1uF
C5
Capacitance
100nF
C2
Capacitance
1uF
C4
Capacitance
100nF
U1 AGND - U2 GND
U4 VO - U1 3.3V
U1 AGND - U2 GND
J1 CC1 - R3 P1
R4 P2 - D1 G
U1 AGND - U2 GND
J1 VBUS4 - U3 IN_1
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
R4 P2 - D1 G
J1 VBUS4 - U3 IN_1
U1 IO21 - U2 SDA
U4 VO - U1 3.3V
U3 OUT_5 - U4 VI
U3 IN_3 - U3 IN_4
U1 AGND - U2 GND
J1
U4
Hole2
Hole4
GND
Hole1
D1
U1
Hole3
  • Generic Inductor
    Generic Inductor
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  • Generic Capacitor
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    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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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