Temperature and Humidity Sensor Node Design
Thought for 3 sec
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:
- Rename the project to something like USB-C WiFi BLE Environmental Sensor Node.
- 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.
- Add a digital temperature/humidity sensor, likely I²C-based, such as SHT40/SHT41/SHT45, HDC302x, or equivalent.
- 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
- Add 5 V to 3.3 V regulation sized from a real power budget.
- 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
- Wire the T/RH sensor:
- I²C SDA/SCL
- Pull-ups
- Local decoupling
- Sensor placement notes to isolate it from regulator/MCU heat
- Add optional user/debug features:
- Status LED
- Reset button
- Programming header or USB-UART if required
- Run ERC/review and fix all unresolved violations before layout.
- 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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