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Temperature and Humidity Sensor Node Design

zhubo

zhubo

Make me a temperature and humidity sensor node with Wifi and Bluetooth, powered by USB-C (5V) for consumer use.
It should be a low-power environmental node with a digital T/RH sensor, ultra-low-power MCU with Wi-Fi + Bluetooth (dual-radio) — 2.4 GHz 802.11 b/g/n plus BLE 5.x powered by USB-C (5 V) — USB-C receptacle 5 V default; include reverse/OVP/UVLO/OCP protection and plan for 0.5–3 A sources.
4 days

flux

1:11

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Plan
#Goal
  • Design a USB-C powered temperature and humidity environmental sensor node for consumer use. The node will include a digital temperature/RH sensor, an ultra-low-power MCU with dual Wi-Fi (802.11 b/g/n) and BLE (5.x) radios, and a power input designed for 5 V USB-C with reverse polarity, OVP, UVLO, and OCP protection, capable of handling 0.5–3 A sources.
#Implementation plan
  1. System Architecture and Component Selection
    1. Define the overall block diagram with a USB-C power input, a protection chain, voltage regulation stages, the Wi-Fi/BLE MCU, and the digital T/RH sensor.
    2. Select and add a USB-C receptacle and protection circuitry from the Flux library that provides reverse polarity, OV, UVLO, and OCP protection for 5 V inputs.
    3. Select and add an ultra-low-power MCU with integrated dual-radio Wi-Fi and BLE capability (e.g., an ESP32 or similar part available in the library).
    4. Select and add a digital temperature/RH sensor that communicates via a digital bus (I2C or similar).
  2. Schematic Design and Interconnections
    1. Add the selected MCU and sensor to the schematic, ensuring power, ground, and digital interface connections.
    2. Wire the USB-C input through the protection chain to the 5 V rail, and further use decoupling and voltage regulation as needed for the MCU and sensor.
    3. Incorporate necessary passive components (resistors, capacitors, inductors) to support the power integrity and RF performance, and add pull-ups/strap components for MCU reset/boot programming.
  3. **PCB Layout Configuration
    1. Configure the PCB with a 4-layer stackup to ensure optimal power integrity and RF performance for the Wi-Fi/BLE sections.
    2. Set RF antenna placement and keepout zones near the MCU and signal paths, ensuring interference minimization and compliance with 2.4 GHz performance requirements.
    3. Define board outlines and placement constraints targeting a compact footprint suitable for consumer use.
  4. **Design Review and Validation
    1. Run ERC/DRC on the schematic and layout, making iterative adjustments to address any issues.
    2. Validate the power subsystem and RF design against datasheet requirements, ensuring successful operations under 0.5–3 A conditions.
#Success criteria
  • The schematic includes a properly designed USB-C input with required protection that meets reverse, OVP, UVLO, and OCP requirements.
  • The selected MCU and sensor are correctly integrated with proper signal and power connections.
  • The PCB layout utilizes a 4-layer stackup with defined RF keepout areas, and all design rules pass ERC/DRC checks.
  • The complete project design is ready for routing and manufacturing preparation.
Add USB ESD
Choose low-power MCU
Size power path
Document requirements
4 days
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