USB-C Temperature Humidity Sensor Node

Worked for 6 mins 35 sec

I renamed the project to USB-C WiFi BLE Environmental Node and updated the description. I also created a project specification file capturing the requirements, architecture, assumptions, and initial power budget: Project Specification.

I selected and researched likely core parts:

MCU/radio: ESP32-C3-WROOM-02-N4 — Wi‑Fi 2.4 GHz 802.11 b/g/n + BLE 5, integrated PCB antenna, native USB pins.
Sensor: SHT40-AD1B-R2 — low-power I2C temperature/RH sensor.
USB-C connector: USB4105-GF-A / USB-C 2.0 receptacle.
Input protection candidate: MP5036AGJ-P eFuse/load switch, but its datasheet text was not accessible in this run, so wiring was not started.
Regulator: AP2114H-3.3TRG1 3.3 V / 1 A LDO; datasheet confirmed 4.7 µF input/output capacitors, EN behavior, 1 A rating, and thermal limits.
USB data ESD: USBLC6-2SC6.
VBUS ESD: TPD1E05U06DPYR.
Reset/boot buttons and status LED candidates were found.

Initial power sizing:

ESP32-C3 rail should be designed for at least 500 mA peak.
SHT40 is sub-mA during measurement, unless heater is used.
3.3 V rail target is about 510 mA peak minimum, so the 1 A AP2114 LDO has current margin, but layout copper/thermal handling will matter.

No schematic components were added or wired yet because execution credits ran out before the build step. Remaining work is to add components, wire the USB-C protection/regulator/ESP32/SHT40/support passives, create firmware notes, run schematic review, and fix any violations.

Add core parts

Find eFuse

USB-C input schematic

Run ERC

Document assumptions

Reviews

Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
16.1k
Generic Capacitor
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jharwinbarrozo
1.5M
Generic Resistor
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jharwinbarrozo
1.5M
Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
jharwinbarrozo
1.2M
875105359001
10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
jharwinbarrozo
1.1M
1070TR
Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
jharwinbarrozo
700.5k

Project Name

USB-C WiFi BLE Environmental Node

Description

USB-C powered low-power consumer environmental sensor node with Wi-Fi/Bluetooth connectivity, digital temperature/humidity sensing, protected 5 V input, and 3.3 V system rail.

Properties

Properties describe core aspects of the project.

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Controls

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seyitgokce / USB-C WiFi BLE Environmental Node

Schematic