USB-C Temp/Humidity Sensor Design

M

meemoe-ezz-300

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.

flux

I’ll build the schematic for a USB‑C powered Wi‑Fi/BLE environmental sensor node: select the MCU/sensor/protection/regulator parts, calculate the power path sizing, wire the circuit with required passives, add project/firmware notes, then run review checks and fix issues.

flux

I selected an ESP32-C3 module, SHT40 sensor, USB-C receptacle, TPS2595-class eFuse, 3.3 V buck regulator, USB ESD, buttons, LED, and generic support passives. I’m checking the active-part datasheets now so the schematic values and wiring follow the recommended circuits.

flux

Done — I created the schematic for the USB‑C powered Wi‑Fi/BLE temperature/humidity sensor node, including protected 5 V input, 3.3 V buck regulation, ESP32‑C3 module, SHT40 I2C sensor, USB data ESD, boot/reset buttons, status LED, and required decoupling/pull resistors.
I also added project files for the power/design notes, firmware starter, and review results. The schematic/ERC checks are clean; remaining full-review errors are expected because the board is not placed/routed yet and generic passives still need production MPNs before manufacturing.
Next checkpoint: I’m ready to move from schematic to layout — size the board, place components with the ESP32 antenna at the edge, then route after placement approval. Want me to proceed with layout?
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Schematic

Layout

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Project Specification
Design Summary
Status: Draft / Review / Approved
Manufacturing target: Prototype / EVT / DVT / PVT / Production
Software / firmware: repository link
Scope
Purpose
In scope
Out of scope
System context
Requirements
Functional
Electrical
Mechanical / environmental
Key constraints
Dependencies and risks
Dependencies
Key risks
Validation
Success criteria
Planned checks
Release-facing notes
Expected deliverables
Special release notes
Change notes / open questions
Changes in this revision
Open questions

  • Design Summary

  • Scope

  • System context

  • Requirements

  • Functional

  • Electrical

  • Mechanical / environmental

  • Key constraints

  • Dependencies and risks

  • Validation

  • Release-facing notes

  • Change notes / open questions