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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Plan
- Design a consumer low-power environmental sensor node featuring digital temperature/humidity sensing, dual-radio ultra-low-power MCU supporting 2.4 GHz 802.11 b/g/n Wi-Fi and BLE 5.x, with USB-C 5V default power and extensive protection (reverse-polarity, over-voltage, under-voltage, and over-current). The node must tolerate USB-C sources ranging from 0.5 A to 3 A.
#Implementation plan
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Update project metadata
- Modify the project description to include the environmental sensor node requirements, focusing on consumer applications.
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Select and add key components from the Flux library
- Choose and add a dual-radio MCU component (e.g., an ESP32 module or equivalent that supports Wi-Fi and BLE 5.x) prioritized for low-power operation.
- Select and add a digital temperature/humidity sensor component (e.g., SHT3x or Si7021 series) with I²C or digital interface.
- Choose and add a USB-C receptacle component configured for 5 V default power.
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Develop the power and protection stage schematic
- Add a USB-C power input section with protective circuitry:
- Integrate components for reverse-polarity protection.
- Include over-voltage protection (OVP), under-voltage lockout (UVLO), and over-current protection (OCP) circuits to safely manage 0.5 A to 3 A USB-C sources.
- Design and add a regulated 3.3 V power rail (using a low dropout regulator or buck converter) to supply the MCU, sensor, and peripherals.
- Place decoupling capacitors around the MCU and sensor to support low-noise operation.
- Add a USB-C power input section with protective circuitry:
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Integrate interconnections and digital interfaces
- Connect the digital sensor interface (e.g., I²C lines) to the dual-radio MCU ensuring proper pull-up resistors where needed.
- Wire the USB-C power path through the protection electronics and into both the 5 V input and the 3.3 V regulation stage.
- Ensure proper ground and power net connections across the schematic.
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Document and review the design
- Annotate the schematic with power domain labels, protection circuit details, and component roles.
- Prepare design documentation that covers the sensor node requirements, key design decisions, power management strategies, and RF considerations for Wi-Fi/BLE.
- Review the schematic for low-power and RF compliance plus protection requirements.
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Transition to PCB layout preparation
- Verify that component footprints are correctly assigned and review constraints specific to low-power and RF operation along with USB-C layout rules.
- Specify guidelines for decoupling placements, trace widths for power lines, and clearance for USB-C and RF signals.
#Success criteria
- The schematic contains a dual-radio MCU with 2.4 GHz Wi-Fi and BLE 5.x and digital temperature/humidity sensor appropriately connected.
- The USB-C input circuitry correctly integrates protection (reverse-polarity, OVP, UVLO, OCP) and supports 0.5 A to 3 A sources with 5 V default operation.
- A regulated 3.3 V power rail is provided for the digital components with necessary decoupling and proper net connections.
- Design documentation clearly outlines the power, protection, and signal interface architecture for consumer low-power environmental sensor node operation.
Choose ESP32-C3
Select SHT31 sensor
Add buck regulator
Run ERC/DRC
Save requirements
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