Wi-Fi and Bluetooth Sensor Node Design

flux

I’m blocked from modifying the project right now because execution credits are exhausted, so I could not add components, wire the schematic, or run validation.
Requested design scope captured:
  • USB-C powered 5 V environmental sensor node
  • Wi-Fi + Bluetooth dual-radio MCU, 2.4 GHz 802.11 b/g/n plus BLE 5.x
  • Digital temperature/humidity sensor
  • Consumer-use power input protection: reverse protection, OVP, UVLO, OCP
  • USB-C default 5 V sink behavior, planned for 0.5–3 A capable sources
  • Low-power architecture
Recommended next implementation plan once execution is available:
  1. Rename the draft project and create a concise project specification.
  2. Select a suitable low-power Wi-Fi/BLE MCU module, likely an ESP32-C3/C6/S3 module depending on GPIO, USB, and power targets.
  3. Select a digital T/RH sensor such as SHT40/SHT41/SHTC3-class I2C sensor.
  4. Design USB-C 5 V input with CC pulldowns, ESD protection, current limiting/eFuse or power-path protection with OVP/UVLO/OCP, and reverse-current blocking.
  5. Add 3.3 V regulation sized from a full power budget, including Wi-Fi TX current peaks.
  6. Wire MCU boot/reset/programming, decoupling, antenna keepout guidance, I2C pullups, sensor decoupling, and status/debug headers as appropriate.
  7. Run schematic review/ERC and fix all violations before moving to layout.
  8. After schematic approval, proceed to PCB placement with RF antenna keepout, USB-C edge placement, short protected power path, and local decoupling.
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