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Temperature and Humidity Sensor Node Design

silverg

silverg

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.
8 days

flux

1:42

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Outlining USB-C design requirements.

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Plan
#Goal
  • Design a low-power, consumer-grade temperature and humidity sensor node with integrated Wi-Fi and Bluetooth connectivity, powered by a 5V USB-C input. The sensor node should include a digital T/RH sensor, an ultra-low-power dual-radio MCU supporting 2.4 GHz 802.11 b/g/n and BLE 5.x, and comprehensive USB-C power input protection featuring reverse polarity, OVP, UVLO, and OCP designed for 0.5–3 A sources.
#Implementation plan
  1. System Architecture and Component Selection
    1. Define the overall system architecture and update project metadata to capture a consumer environmental node with USB-C power and protection.
    2. Select and add a digital temperature and humidity sensor (e.g., Sensirion SHTC3 or equivalent) to the schematic.
    3. Select and add an ultra-low-power MCU with integrated Wi-Fi and Bluetooth (dual-radio) support—targeting a chip such as the ESP32-S3 or similar.
  2. USB-C Power Input and Protection Circuit
    1. Add a USB-C receptacle configured to provide a 5V output by default.
    2. Design and add input protection circuitry including reverse polarity protection, OVP, UVLO, and OCP sections to handle a current range between 0.5 A and 3 A.
  3. Schematic Integration and Connectivity
    1. Interconnect the selected digital T/RH sensor to the MCU using the appropriate digital communication protocol (I²C or SPI).
    2. Integrate the USB-C power input and protection circuitry to feed the MCU and sensor power rails.
    3. Ensure proper decoupling and filtering components are added to the power lines.
  4. PCB Layout Planning
    1. Plan the PCB layout with careful attention to the 2.4 GHz RF performance, ensuring antenna-clearance zones, proper impedance-controlled traces, and separation of RF and digital sections.
    2. Define board size and stackup based on the consumer-grade device requirements.
  5. Design Review and Finalization
    1. Review the complete schematic for functional connectivity, electrical integrity, and adherence to low-power constraints.
    2. Review planned PCB layout for manufacturability, appropriate component placement, and signal integrity.
    3. Update project properties with design metadata and documentation for production.
#Success criteria
  • The schematic includes a digital T/RH sensor, a low-power dual-radio MCU, and robust USB-C power input with protection circuits as specified.
  • The design meets all power, RF, and connectivity requirements, with clear board planning for production-grade reliability.
Add USB ESD
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8 days
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