Temperature and Humidity Sensor Node Design
0:24
Thought for a moment
Blocked before implementation: I have not modified the project yet. The project is still empty, so no schematic, component selection, protection network, or power-path sizing has been created.
What I would build for your requirements:
- USB-C 5 V sink input with CC pulldowns, sized for 0.5–3 A source capability negotiation at default 5 V only
- Input protection chain for consumer use: fuse/current limiting, reverse protection, OVP/UVLO power switch or eFuse, and ESD protection
- Low-power dual-radio MCU with 2.4 GHz Wi‑Fi + BLE 5.x, most likely an ESP32-C6 or ESP32-S3-class solution depending sleep-current and firmware priorities
- Digital temperature/RH sensor, likely SHT4x or HDC302x class, on I2C
- 3.3 V power tree with proper regulator selection based on peak Wi‑Fi current, plus full decoupling and boot/support circuitry
- Connector/test/programming access and antenna/layout constraints called out for later PCB work
What remains to be done:
- Calculate full power budget from USB-C input through protection and 3.3 V regulation
- Select exact MCU, sensor, protection IC/eFuse, regulator, USB-C receptacle, and passives from datasheets
- Draw the complete schematic per recommended application circuits
- Verify all pins, decoupling, boot straps, and protection behavior
- Run electrical checks and fix any violations
- Then pause for your approval before moving to layout
Recommended architecture, so you can approve direction now:
- MCU: ESP32-C6-MINI-1 for low-power Wi‑Fi + BLE 5 and good ecosystem
- Sensor: Sensirion SHT41
- Input protection: USB ESD diode + 5 V eFuse/hot-swap switch with OVP/UVLO/OCP + reverse blocking
- Regulation: 5 V to 3.3 V buck or high-current LDO depending size/efficiency target; for low-power but Wi‑Fi-capable consumer node, I’d lean buck for thermal margin
If you want, I can turn this into a concrete schematic plan and BOM as the next step once editing capability is available.
Create plan and BOM
Use selected parts
Prioritize low cost
Size for 3 A
Compare regulator options
Finished working
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