Temperature and Humidity Sensor 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.
17 days
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You want a low-power consumer temperature/humidity sensor node with dual-radio Wi-Fi + BLE and protected USB-C 5 V input.
- I’ve created a plan covering architecture, major parts, USB-C protection, power path, and schematic integration.
- It’s ready to execute.
Click Start on the plan bar to build it. If you want, I can also update the plan first with extras like battery backup, enclosure limits, or a target size.
Plan
Goal
- Design a consumer low-power temperature and humidity sensor node that integrates a digital temperature/humidity sensing element and an ultra-low-power MCU with integrated Wi-Fi and Bluetooth (supporting 2.4 GHz 802.11 b/g/n and BLE 5.x), powered from a USB-C 5 V source. The design must incorporate a USB-C receptacle with reverse polarity, over-voltage protection, under-voltage lockout, and over-current protection to ensure robust operation across USB sources delivering from 0.5 A to 3 A.
- Define the system architecture
- Capture and document functional requirements and constraints including low-power operation, sensor integration, wireless dual-radio needs, and robust USB-C power input protection.
- Set the project description to reflect a sensor node for consumer environmental monitoring.
- Select and add major components to the schematic
- Select and add a digital temperature/humidity sensor (e.g., a common digital sensor from the library).
- Select and add an ultra-low-power MCU with integrated Wi-Fi and Bluetooth. For example, consider using a part like the ESP32 if it meets the power and wireless specifications.
- Establish the USB-C power entry subsystem
- Add a USB-C receptacle and configure its footprint.
- Integrate protection circuits for reverse polarity, over-voltage, under-voltage lockout, and over-current protection. Choose and add components (such as protection FETs/TVS diodes or dedicated power management ICs) that handle the range from 0.5 A to 3 A.
- Develop power regulation and supporting circuits
- Add regulators, filtering capacitors, and supporting passive components to achieve reliable 5 V operation.
- Connect the power path ensuring that all protection devices are correctly placed.
- Integrate interconnections and review the schematic
- Make and verify net connections between the sensor, MCU, and USB-C power entry/protection circuits.
- Cross-check the schematic against the functional requirements.
- Prepare documentation for prototype validation
- Finalize the schematic review and note test points for power integrity and sensor functionality.
- Update project properties and description to reflect the design status.
- The schematic includes a digital temperature/humidity sensor integrated with a low-power MCU featuring dual Wi-Fi/Bluetooth radios.
- The USB-C input path includes reverse polarity, over-voltage, under-voltage lockout, and over-current protection, and supports 0.5 A to 3 A power sources.
- All components are correctly connected and the design meets the outlined power and functional requirements.
Add ESD and LEDs
Use ESP32-C6
Set board size
17 days
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