Temperature and Humidity Sensor Node Design

flux

I can’t continue executing design work in this session because available execution credits are exhausted.
Current project state:
  • No schematic components have been added.
  • No nets or PCB layout exist yet.
  • No datasheets, component library parts, ERC/DRC checks, or simulations were run in this session.
Requested design to implement next:
  • USB-C 5 V powered consumer environmental sensor node.
  • Wi-Fi + Bluetooth dual-radio MCU/module supporting 2.4 GHz 802.11 b/g/n and BLE 5.x.
  • Digital temperature / relative humidity sensor.
  • USB-C receptacle configured for 5 V default power.
  • Input protection for reverse polarity, overvoltage, undervoltage lockout, and overcurrent.
  • Power path sized for USB-C sources from 0.5 A to 3 A.
  • Low-power architecture with proper regulator selection, decoupling, antenna keepout, and firmware-ready pin mapping.
Recommended next implementation approach:
  1. Select a certified Wi-Fi/BLE module, likely ESP32-C3, ESP32-S3, or ESP32-C6 class depending on BLE/Wi-Fi requirements and power budget.
  2. Select a digital T/RH sensor such as Sensirion SHT4x/SHT3x or TI HDC302x.
  3. Build the USB-C input stage with CC pull-downs, ESD protection, current limiting/eFuse or power switch, OVP/UVLO/OCP, and reverse-current protection.
  4. Add a 3.3 V regulator sized from the calculated downstream load.
  5. Wire MCU/module, sensor, USB-C power, programming/debug header, boot/reset circuitry, decoupling, and I²C pull-ups per datasheets.
  6. Run schematic review/ERC and fix all unresolved violations.
  7. After schematic approval, proceed to board sizing, placement, antenna keepout, routing, and DRC.
When credits are available again, the first step should be creating a project specification and selecting datasheet-backed parts before wiring the schematic.
Create project spec
Find ESP32-C6 modules
Compare T/RH sensors
Design power path
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