USB C WiFi BLE Sensor Node

Created 4 project docs
Design Notes — USB-C WiFi BLE Environmental Node
Input: USB-C receptacle J1, 5 V sink-only, USB 2.0 D+/D- routed to ESP32-C3 native USB Serial/JTAG. USB-C configuration: R1/R2 = 5.1 kΩ Rd f...
View doc
Firmware Starter — ESP32-C3-WROOM-02-N4
MCU/module: ESP32-C3-WROOM-02-N4 Framework: Arduino on PlatformIO
View doc
Board Bring-Up Plan — USB-C WiFi BLE Environmental Node
Equipment: current-limited 5 V USB supply or USB power meter, multimeter, oscilloscope, USB-C cable, ESD-safe workstation, PlatformIO firmwa...
View doc
Technical Construction File — USB-C WiFi BLE Environmental Node
Draft, schematic-stage. FCC Part 15 intentional radiator integration using pre-certified module conditions.
View doc

flux

Implemented the schematic for the USB-C powered Wi‑Fi/BLE temperature/humidity node and created the supporting project files:
Open items:
  • PCB layout has not been started yet; airwires are expected until placement/routing.
  • Generic passives/testpoints still need production MPN assignment before manufacturing export.
  • Layout must enforce ESP32 antenna keepout and keep the SHT40 away from heat sources.
Suggested next steps:
  1. Set board size/stackup and antenna/sensor placement constraints.
  2. Place components with the ESP32 antenna at the board edge.
  3. Route USB, buck power, and I2C nets.
  4. Assign production MPNs for generic passives and test pads.
Create layout constraints
Assign passive MPNs
Run schematic review
Start PCB placement
Prepare layout intent
D1
J1
C3
Capacitance
3.3nF
C2
Capacitance
1µF
C6
Capacitance
10µF
C5
Capacitance
10µF
C1
Capacitance
100nF
C7
Capacitance
120pF
C4
Capacitance
4.7µF
C2 P2 - C3 P2
C2 P2 - C3 P2
GND
GND
C6 P2 - R7 P2
C2 P2 - C3 P2
GND
R2 P2 - U1 GND
GND
GND
GND
C2 P2 - C3 P2
C6 P2 - R7 P2
C2 P2 - C3 P2
R2 P2 - U1 GND
C2 P2 - C3 P2
R2 P2 - U1 GND
C2 P2 - C3 P2
GND
GND
GND
R2 P2 - U1 GND
R13 P2 - R15 P2
U2 PG - R8 P1
U1 IN - TP1 P1
J1 CC1 - R1 P1
C4 P1 - U2 VIN
U3 IO2 - R11 P2
J1 DN1 - J1 DN2
U1 ~{FLT} - R15 P1
J1 DP1 - J1 DP2
U1 IN - TP1 P1
U3 IO1 - U4 SCL
J1 CC2 - R2 P1
U1 OUT - C2 P1
U1 IN - TP1 P1
U2 PG - R8 P1
C7 P1 - U3 3V3
U3 EN - R9 P2
U3 TXD - TP7 P1
J1 DN1 - J1 DN2
U1 EN/UVLO - R4 P2
U1 dVdt - C3 P1
J1 CC1 - R1 P1
J1 DP1 - J1 DP2
U1 ILM - R3 P1
J1 VBUS__1 - D2 1
J1 CC2 - R2 P1
J1 DN1 - J1 DN2
U2 PG - R8 P1
R13 P2 - R15 P2
C6 P1 - R6 P1
C6 P1 - R6 P1
U3 IO9 - R10 P2
J1 DP1 - J1 DP2
U1 ~{FLT} - R15 P1
L1 2 - C5 P1
J1 VBUS__1 - D2 1
U1 dVdt - C3 P1
J1 DN1 - J1 DN2
C4 P1 - U2 VIN
J1 VBUS__1 - D2 1
C9 P1 - U4 VDD
U1 IN - TP1 P1
C4 P1 - U2 VIN
U1 ILM - R3 P1
U2 FB - R6 P2
J1 DP1 - J1 DP2
U2 FB - R6 P2
U1 EN/UVLO - R4 P2
J1 VBUS__1 - D2 1
J1 DP1 - J1 DP2
U1 OUT - C2 P1
L1 2 - C5 P1
C4 P1 - U2 VIN
D2
R8
Resistance
100kΩ
R3
Resistance
2.49kΩ
R2
Resistance
5.1kΩ
U2
R1
Resistance
5.1kΩ
R15
Resistance
100kΩ
TP1
TP3
R7
Resistance
100kΩ
R4
Resistance
1MΩ
R5
Resistance
387kΩ
TP2
R6
Resistance
450kΩ
L1
Inductance
470nH
U1
  • Generic Inductor
    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
    16.4k
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • Net Portal
    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
    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
    875105359001
    10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
    jharwinbarrozo
    1.1M
  • 1070TR
    1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
    jharwinbarrozo
    700.5k

USB-C WiFi BLE Environmental Node

USB-C WiFi BLE Environmental Node thumbnail
Consumer USB-C 5 V powered low-power temperature and humidity sensor node with ESP32-class Wi-Fi/BLE 5.x connectivity, USB-C sink input, protected 5 V power path, and 3.3 V digital sensor subsystem.

Properties

5

V

Consumer Electronics

RoHS

Arduino

USB

WiFi

Pricing & Availability

Distributor

Qty 1

Arrow

$2.17–$3.07

Digi-Key

$0.00

HQonline

$4.41–$4.48

LCSC

$5.95–$6.13

Mouser

$9.69

TME

$0.54

Verical

$2.92–$5.32

Controls