Temperature and Humidity Sensor Node Design
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.
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Analyzing in depth.
Search docs: How to plan and build a PCB project in Flux from requirements through schematic, PCB layout, review, and documentation.
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Plan
- Design a consumer-grade USB-C powered environmental sensor node that measures temperature and humidity using a digital sensor, and offers dual-radio WiFi (802.11 b/g/n) plus Bluetooth Low Energy 5.x connectivity. The system is based on an ultra-low-power MCU with integrated WiFi/BLE, and is designed for low-power operation while accepting 5 V from a USB-C source (0.5–3 A) with integrated reverse polarity, OVP, UVLO, and OCP protection.
#Implementation plan
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System Architecture & Component Selection
- Define power path and protection requirements (reverse polarity, OVP, UVLO, OCP) for USB-C 5 V input and select appropriate USB-C connector and protection circuitry.
- Choose and add an ultra-low-power MCU module with integrated dual-radio WiFi/BLE. For example, select an ESP32 variant or similar part from the library.
- Select and add a digital temperature/humidity sensor (e.g. SHT30 or comparable sensor) into the design.
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**Schematic Design
- Create the USB-C power input section.
- Add the USB-C receptacle with CC configuration circuitry.
- Integrate reverse polarity, OVP, UVLO, and OCP protection circuitry into the power input design.
- Design the power regulation subsystem.
- Add power management components to regulate and distribute the 5 V to required rails for the MCU and sensor.
- Add and connect the MCU:
- Place the chosen dual-radio MCU, add necessary decoupling, oscillator, and programming/debug circuitry.
- Connect the MCU to the power rails and relevant RF power paths.
- Add and connect the digital temperature/humidity sensor:
- Interface the sensor through I²C or other supported protocol with appropriate decoupling and pull-ups.
- Create the USB-C power input section.
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**PCB Layout and Routing
- Configure the PCB layout with a compact sensor node form factor suitable for consumer use.
- Position the USB-C connector at the board edge and place the RF-sensitive MCU and antenna areas with proper clearance and impedance control.
- Route all critical nets, paying special attention to decoupling, ground planes, and RF signal integrity.
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**Project Metadata and Verification
- Update project metadata and component roles for clarity.
- Document schematics, layout decisions, and note any follow-up actions for routing or firmware integration.
#Success criteria
- The schematic includes a complete USB-C power input with integrated reverse polarity, OVP, UVLO, and OCP protection for a 5 V input supporting 0.5–3 A.
- The design includes an ultra-low-power MCU with WiFi/BLE connectivity and a digital temperature/humidity sensor with proper signal routing and decoupling.
- The PCB layout positions the USB-C connector at the edge, maintains RF clearance and routing integrity, and is ready for further design reviews and validation before fabrication.
Add USB-C ESD
Use ESP module
Isolate sensor thermally
Document requirements
Ready to work
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