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Temperature and Humidity Sensor Node Design

flux

0:29

I’ve prepared a plan to build your low‑power Wi‑Fi + BLE T/RH sensor node powered by USB‑C.
  • Steps:
    1. Add MCU module (dual‑radio Wi‑Fi 802.11 b/g/n + BLE 5.x), digital T/RH sensor, and USB‑C receptacle.
    2. Implement power path: CC resistors, reverse/OVP/UVLO/OCP, TVS, and a low‑IQ 3.3 V regulator with decoupling.
    3. Add RF/antenna (or certified module), programming header, status LED, and test pads.
    4. Wire USB‑C, power rails, I2C, and control nets; add pulls/filters; run ERC/DRC.
    5. Prepare PCB footprints and RF‑aware placement; run auto‑layout and review.
Click Start on the plan bar to execute. Preferences before we begin:
  • MCU: certified module (smaller/faster to certify) or chip‑down?
  • Sensor: SHT4x/SHT3x, HDC3xxx, or your preference?
  • Size constraints or enclosure?
  • Any specific protection ICs (ideal diode/OVP switch, eFuse), or should I pick proven parts?
Plan
#Goal
  • Design a consumer-grade, low-power environmental sensor node powered by USB-C (5 V) input, capable of handling 0.5–3 A sources. The node will integrate an ultra-low-power dual‑radio MCU supporting 802.11 b/g/n Wi‑Fi and BLE 5.x, paired with a digital temperature/humidity sensor. The design will include robust USB-C power input protection features such as reverse polarity, over-voltage, under-voltage lockout, and over-current protection, along with necessary supply conditioning and RF components.
#Implementation plan
  1. Key Components Selection and Addition
    1. Select and add an ultra‑low‑power dual‑radio MCU with Wi‑Fi (802.11 b/g/n) and BLE 5.x support (e.g., ESP32 series) to the project.
    2. Select and add a digital temperature/humidity sensor (e.g., SHT3x) to the schematic.
    3. Select and add a USB‑C receptacle and related USB‑C configuration channel (CC) circuitry.
  2. **Power Management and Protection
    1. Design and add a power chain starting with a USB‑C input section:
      1. Include CC resistors and a USB‑C configuration circuit to negotiate proper power delivery.
      2. Add power input protection components for reverse polarity, over-voltage (using TVS diodes), under-voltage lockout, and over-current conditions.
    2. Select and add a 3.3 V regulator with proper decoupling circuits and passives for low-noise operation.
  3. Supporting Components and Connectivity
    1. Add necessary decoupling capacitors, resistors, and TVS diodes on power rails.
    2. Provide proper clock components (e.g., crystal oscillator if required by the MCU) and program/debug connectors.
    3. Add status indicator LED(s) and test pads for functional verification.
  4. RF and Layout Considerations
    1. Include the design of an RF antenna or plan to integrate a certified module, ensuring proper RF matching and layout practices for low-power operation.
    2. Define placement guidelines in the schematic and PCB layout (e.g., component spacing and thermal management hints).
  5. Schematic Integration and Verification
    1. Wire connections between the MCU, sensor, USB‑C input, power management, and RF components ensuring proper net assignments.
    2. Run ERC/DRC reviews to validate circuit functionality and protection compliance.
  6. PCB Preparation
    1. Prepare PCB footprints and assign stackup defaults considering RF routing and power integrity.
    2. Run auto‑layout for initial component placement and routing while reviewing trace widths and impedance standards.
#Success criteria
  • Complete schematic incorporating the ultra‑low‑power MCU, digital T/RH sensor, and full USB‑C power input protection scheme.
  • Verification of power protection circuitry (reverse, over-voltage, under-voltage, and over-current) and proper 3.3 V regulation.
  • Verified ERC/DRC with no errors and a layout that adheres to RF and low-power design best practices.
Choose certified MCU module
Pick sensor family
Define enclosure constraints
Select protection approach
Clarify USB-C behavior
171 days
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Reviews

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