Wi-Fi/Bluetooth Sensor Node Design
Thought for 3 sec
I’m blocked because execution credits are exhausted, so I can’t modify the project or add schematic/layout content right now.
Current project state:
- No components added.
- No nets/wiring created.
- The project is still an empty draft.
Recommended design plan when execution can continue:
- Rename project to something like USB-C WiFi/BLE Environmental Sensor Node.
- Use an ultra-low-power Wi-Fi + BLE 5.x MCU/module, likely an ESP32-C6, ESP32-S3, or similar certified module depending on low-power and RF requirements.
- Add a digital temperature/humidity sensor over I²C, such as Sensirion SHT4x/SHTC3 or Bosch BME280/BME680 if pressure/VOC is desired.
- USB-C power input:
- USB-C receptacle with 5.1 kΩ CC pull-down resistors for default 5 V source detection.
- Input fuse or eFuse sized for 0.5–3 A sources.
- Reverse-current protection.
- Overvoltage protection.
- Undervoltage lockout.
- Overcurrent protection.
- TVS diode for ESD/surge protection.
- Power tree:
- Protected USB-C 5 V rail.
- High-efficiency 3.3 V regulator for MCU and sensor.
- Proper input/output capacitors per regulator datasheet.
- RF/layout:
- Use a pre-certified Wi-Fi/BLE module if this is for consumer use.
- Keep antenna area clear of copper, components, and enclosure metal.
- Add programming/debug connector, reset/boot circuitry, decoupling capacitors, I²C pull-ups, and optional status LED.
- Validate schematic with datasheets, ERC review, and power budget before moving to PCB layout.
Once credits are available, the next step is to build and verify the full schematic first, then pause for your approval before PCB layout.
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