Temperature and Humidity Sensor Node Design

flux

I’m blocked because project execution credits are exhausted, so I can’t modify the schematic, add components, consult datasheets, or run design review in this session.
Current project state:
  • Empty project
  • 0 components
  • 0 nets
  • No schematic work has been applied yet
Recommended design plan when credits are available:
  1. Rename the project to something like USB-C WiFi BLE Environmental Sensor Node.
  2. Select an ultra-low-power Wi-Fi + BLE MCU/module, likely an ESP32-C6, ESP32-C3, or similar 2.4 GHz Wi-Fi 802.11 b/g/n + BLE 5.x module.
  3. Add a digital temperature/humidity sensor, likely I²C-based, such as SHT40/SHT41/SHT45, HDC302x, or equivalent.
  4. Design the USB-C 5 V input:
    • USB-C receptacle with default 5 V sink CC resistors
    • Input fuse or current limiter sized for 0.5–3 A sources
    • Reverse-current / reverse-polarity protection
    • Over-voltage protection
    • Under-voltage lockout
    • Over-current protection
    • TVS protection for consumer robustness
  5. Add 5 V to 3.3 V regulation sized from a real power budget.
  6. Wire MCU/module per datasheet:
    • Power pins and decoupling
    • Boot/strapping pins
    • EN/reset circuit
    • UART/programming access if needed
    • RF antenna keepout if using a module with PCB antenna
  7. Wire the T/RH sensor:
    • I²C SDA/SCL
    • Pull-ups
    • Local decoupling
    • Sensor placement notes to isolate it from regulator/MCU heat
  8. Add optional user/debug features:
    • Status LED
    • Reset button
    • Programming header or USB-UART if required
  9. Run ERC/review and fix all unresolved violations before layout.
  10. After schematic validation, proceed to PCB layout with RF antenna keepout, USB-C edge placement, power protection near the connector, and sensor thermally isolated from heat sources.
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