Temperature and Humidity Sensor Node Design
Thought for 3 sec
Current state: no schematic work has been executed yet in the project. The project is still empty, so nothing has been placed, wired, or validated.
What I would build for your spec:
- USB-C 5 V sink-only power entry with 5.1 kOhm CC resistors
- Front-end protection covering reverse input protection plus OVP/UVLO/OCP sized for 0.5 A to 3 A source capability
- High-efficiency 3.3 V rail for the logic domain
- Low-power dual-radio MCU with 2.4 GHz Wi-Fi b/g/n + BLE 5.x, most likely an ESP32-C3 or ESP32-C6 class device depending your Bluetooth/Wi-Fi tradeoff
- Digital temperature/RH sensor on I2C, consumer-grade, low power, likely SHT4x or AHT20-class only after datasheet confirmation
- Required support circuitry: decoupling, reset/boot strapping, antenna keepout considerations, programming/debug header or USB-UART access, status LED if desired
What remains to be done:
- Define the exact MCU and sensor from datasheets
- Calculate the full power budget and select the protection/power-path parts accordingly
- Draw the full schematic with all support passives
- Run electrical review and fix all violations
- Then, with your approval, move into PCB layout, placement, and routing
Important note on your requirement:
- “Plan for 0.5–3 A sources” means the node should safely accept USB-C sources capable of supplying anywhere in that range; it does not mean the node itself should consume 3 A. The protection and connector path should be rated accordingly.
Because execution is currently unavailable, I can’t build the schematic in-project right now. Once execution is available again, I’ll start with the power-path sizing and datasheet-grounded part selection, then complete the schematic end-to-end. Ready when you are.
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