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.
3 days
1:53
Planning with smart_friend.
Thinking deeply about your request.
Drafting execution plan for Flux project.
Structuring Flux project plan.
I've made a plan, and started work on it.
Plan
- Design a consumer-grade, USB-C powered 5 V environmental sensor node that measures temperature and humidity. The node will use a digital temperature/RH sensor combined with an ultra-low-power MCU featuring dual Wi-Fi (2.4 GHz 802.11 b/g/n) and Bluetooth (BLE 5.x) radios, and must include a USB-C receptacle designed as a 5 V default sink with integrated reverse polarity, over-voltage, under-voltage lockout, and over-current protection for sources ranging from 0.5 to 3 A.
#Implementation plan
-
Define Power and Protection Subsystem
- Select and add a USB-C connector from the Flux library, ensuring the connector supports 5 V input and sink configuration.
- Add and configure protection circuitry components covering reverse polarity, OVP, UVLO, and OCP on the 5 V rail. Make sure datasheets are consulted to support a range of 0.5-3 A.
-
Select and Add Core Components
- Select and add an ultra-low-power MCU with dual Wi-Fi and Bluetooth (BLE 5.x) capabilities from the Flux library ensuring support for 2.4 GHz 802.11 b/g/n; verify its integration and datasheet details.
- Select and add a digital temperature and humidity sensor, and connect it appropriately to the MCU via its digital communication interface.
-
Implement Supporting Circuits
- Add required supporting passive components (e.g., decoupling capacitors, resistors) to ensure noise reduction and stable power delivery to both the MCU and sensor circuits.
- Establish a regulated supply rail if required by the MCU and sensor, configuring the circuit paths accordingly.
-
Schematic Wiring and Connectivity
- Connect the USB-C input through the protection circuit to the power regulator and the MCU/sensor supply rail.
- Wire the digital interface for the temperature/RH sensor to the appropriate MCU pins.
- Add necessary connections for MCU programming, boot, and reset circuits.
-
PCB Layout Design
- Explicitly set the board size in the layout planner.
- Position the USB-C connector near the board edge and place the RF antenna in an edge keepout area according to manufacturer placement guidelines.
- Layout the power protection circuitry close to the USB-C connector for optimal performance.
- Complete component placement ensuring thermal isolation of the sensor from potential heat parts and providing clear routing paths for connectivity.
#Success criteria
- The schematic includes a correctly connected USB-C input with full reverse/OVP/UVLO/OCP protection covering 0.5-3 A.
- An ultra-low-power MCU with Wi-Fi (802.11 b/g/n) and BLE 5.x, along with a digital temperature/humidity sensor, are successfully integrated and interconnected.
- PCB layout adheres to board size specifications, places the RF antenna near an edge keepout, and positions the USB-C connector and power circuitry optimally for protection and performance.
- All design choices and connections are validated through component datasheets in the Flux library.
Add ESD and RF
Choose low power MCU
Add debug header
Use SHT4x sensor
Document requirements
3 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.