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.
6 days
1:11
Thinking deeply about your request.
Creating a project plan.
Working on your request.
Analyzing the PCB layout.
Analyzing the schematic.
Planning requirements capture.
Working on your request.
Summarizing proposed plan.
Summarizing components and actions.
You want a low-power USB-C temperature/humidity sensor node with Wi-Fi + Bluetooth and protected 5 V power input.
I’ve prepared a Plan to:
- define the USB-C input and protection chain
- add power regulation
- integrate the wireless MCU and digital T/RH sensor
- connect and review the full schematic
It’s ready to execute. Click Start on the plan bar to build it.
Plan
- Design a low-power consumer temperature and humidity sensor node for the 'Fragile Orange Tricorder' project. This node will integrate a digital temperature/humidity sensor and an ultra-low-power MCU with dual-radio 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth LE 5.x, powered by a 5 V USB-C input. The design will include a robust front-end protection circuit covering reverse polarity, over-voltage, under-voltage, and over-current conditions, compatible with USB-C sources ranging from 0.5 A to 3 A.
#Implementation plan
-
USB-C Power Input and Front-End Protection
- Add a USB-C connector to the schematic.
- Design a front-end protection circuit incorporating:
- Reverse polarity protection (e.g. using a Schottky diode or MOSFET based circuit).
- Over-voltage and under-voltage protection using TVS diodes and voltage supervisors.
- Over-current protection with a resettable fuse or current limiter suitable for 0.5 A to 3 A sources.
- Confirm that the protection circuit does not impact the low-power operation during standby.
-
Power Regulation Subsystem
- Add a low-dropout regulator (or buck converter) to step down from the protected 5 V input to the 3.3 V (or required voltage) for the MCU and sensor.
- Verify proper filtering and decoupling with capacitors to ensure stable power for low-power operation.
-
MCU and Wireless Connectivity
- Select and add an ultra-low-power MCU with dual-radio capabilities (Wi-Fi 802.11 b/g/n and Bluetooth LE 5.x), such as the ESP32-WROOM series.
- Place the MCU in the schematic and connect it to the power regulator, ensuring proper decoupling and crystal clock if needed.
-
Digital Temperature/Humidity Sensor
- Select and add a digital temperature/humidity sensor (for example, Sensirion SHT3x or a similar low-power sensor).
- Connect the sensor to the MCU via appropriate digital interface (typically I²C), including pull-up resistors if required.
-
System Integration and Verification
- Connect all sub-systems together, ensuring proper net connections between the power rail, MCU, sensor, and protection circuits.
- Update the project description to include the defined system architecture and component functionalities.
- Review the schematic for component completeness and functional integrity.
#Success criteria
- The schematic includes a USB-C connector, complete front-end protection circuitry, and proper power regulation from 5 V to required levels.
- The ultra-low-power MCU with dual-radio capabilities and digital sensor are correctly integrated with proper digital communications.
- The design meets the consumer low-power requirements and operates safely with USB-C sources between 0.5 A and 3 A.
Add ESD too
Use ESP32-C6
Set 3.3V rail
Prefer compact BOM
6 days
To get started, talk to Flux or create a New Document.
Welcome 👋
Flux helps you build PCBs faster with an AI teammate!
Create your account to collaborate, stay updated, fork your own version, and get instant answers from our AI agent.