Temperature and Humidity Sensor Node Design
Thought for 3 sec
I’m blocked from making project changes right now because execution credits are unavailable, so I could not add components, wire the schematic, consult datasheets, or run review checks in this session.
Current project state:
- No schematic components have been added.
- No nets or PCB layout have been created.
- The project is still an empty draft.
Recommended next design plan once execution is available:
- Rename and document the project as a USB-C powered Wi-Fi/BLE temperature-humidity sensor node.
- Select an ultra-low-power Wi-Fi + BLE 5.x MCU/module, likely an ESP32-C6/ESP32-C3-class module depending on availability and power targets.
- Add a digital temperature/RH sensor over I²C, such as Sensirion SHT4x/SHT3x or TI HDC302x-class.
- Build the USB-C 5 V input stage:
- USB-C receptacle with 5.1 kΩ CC pull-downs for default 5 V sink operation.
- ESD protection.
- Reverse-current protection.
- Over-voltage protection.
- Under-voltage lockout.
- Over-current protection sized for 0.5–3 A sources.
- Add 5 V to 3.3 V regulation sized from a proper power budget.
- Wire all MCU, sensor, USB-C, power protection, and regulator circuitry per datasheets, including decoupling capacitors.
- Add programming/debug access, status LED, reset/boot support, and optional test points.
- Run schematic review and fix all ERC issues.
- Create a bring-up/test plan and firmware pin map before moving to PCB layout.
Once credits are available, the first step should be schematic design and datasheet-grounded component selection before any layout work.
Choose core parts
Find protection ICs
Calculate power budget
Save requirements note
Define schematic blocks
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