Temperature and Humidity Sensor Node Design
Thought for 7 sec
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What remains to be done when execution is available:
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Define the architecture:
- USB-C 5 V input with CC resistors for default current advertisement detection.
- Input protection: reverse-current protection, OVP, UVLO, OCP/current limiting, ESD/TVS.
- 5 V → 3.3 V regulator sized for Wi-Fi transmit peaks.
- Ultra-low-power Wi-Fi + BLE 5.x MCU/module.
- Digital temperature/humidity sensor over I²C.
- Programming/debug connector and status LED if desired.
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Select datasheet-backed parts:
- MCU/module: likely ESP32-C3, ESP32-C6, or similar Wi-Fi/BLE module depending on low-power and BLE version requirements.
- T/RH sensor: Sensirion SHT4x/SHT3x, TI HDC3xxx, or equivalent.
- USB-C receptacle and protection/power-path ICs rated for 0.5–3 A source planning.
- 3.3 V regulator with enough transient current margin for Wi-Fi.
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Build the schematic:
- USB-C input and protection.
- Regulator and decoupling.
- MCU/module with boot/programming requirements, antenna keepout notes, and all required passives.
- I²C T/RH sensor with pull-ups and decoupling.
- Test points and optional user/debug features.
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Validate:
- Run ERC/review.
- Verify every IC against datasheet recommended circuits.
- Confirm power budget and current ratings.
- Only then proceed to PCB layout, placement, and routing after your approval.
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Design USB-C protection
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