Temperature and Humidity Sensor Node Design

flux

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:
  1. Calculate full power budget from USB-C input through protection and 3.3 V regulation
  2. Select exact MCU, sensor, protection IC/eFuse, regulator, USB-C receptacle, and passives from datasheets
  3. Draw the complete schematic per recommended application circuits
  4. Verify all pins, decoupling, boot straps, and protection behavior
  5. Run electrical checks and fix any violations
  6. 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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R14
R5
R15
R7
R13
C1
Capacitance
0.1µF
R6
R2
R4
R19
R12
R3
R1
R11
R8
R9
R10
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Sweet Maroon Esper Photo Analyser

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