WiFi & Bluetooth Sensor Node

flux

Implemented the schematic for the USB-C powered Wi‑Fi/BLE temperature/humidity node. It uses a SiWG917 Wi‑Fi/BLE 5.4 module, SHT41 T/RH sensor, USB-C sink input, TPS25940 true reverse-blocking eFuse with OVP/UVLO/OCP/soft-start, MP28301 3.3 V buck regulator, ESD protection, reset/ISP/SWD debug, I2C pull-ups, and status LED.
Created project files:
Open items:
  • PCB layout/routing is not done yet, so airwire DRC errors are expected.
  • Generic passives still need final manufacturer MPNs before manufacturing export.
  • Layout must enforce the SiWG917 antenna keepout and thermal isolation around the SHT41.
Suggested next steps:
  1. Set board size/stackup and move into PCB placement.
  2. Place U1 at the board edge with antenna keepout and U4 away from heat sources.
  3. Route power, buck, I2C, SWD/UART, and USB-C protection paths.
  4. Assign final passive MPNs and run full DRC/manufacturing checks.
Place route and MPNs
Start PCB placement
Assign passive MPNs
Route the PCB
Run full review
D1
J1
U1
U2
R1
Resistance
5.1kΩ
R13
Resistance
100kΩ
R4
Resistance
100kΩ
R7
Resistance
100kΩ
R10
Resistance
10kΩ
R15
Resistance
19.1kΩ
R3
Resistance
88.7kΩ
R14
Resistance
100Ω
R2
Resistance
5.1kΩ
R8
Resistance
100kΩ
R9
Resistance
10kΩ
R6
Resistance
39.2kΩ
R11
Resistance
1kΩ
R12
Resistance
10kΩ
R5
Resistance
464kΩ
C4
Capacitance
10µF
C17
Capacitance
1nF
C7
Capacitance
100nF
C3
Capacitance
10µF
C5
Capacitance
10µF
U3
C13
Capacitance
100nF
C2
Capacitance
10nF
C15
Capacitance
100nF
C8
Capacitance
1µF
C14
Capacitance
1µF
C9
Capacitance
10µF
C10
Capacitance
100nF
C1
Capacitance
1µF
C16
Capacitance
10nF
C6
Capacitance
10µF
C12
Capacitance
100nF
C11
Capacitance
100nF
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USB-C WiFi BLE TH Sensor

USB-C WiFi BLE TH Sensor thumbnail
Consumer USB-C powered environmental sensor node with Wi-Fi, BLE 5.x, digital temperature/humidity sensing, protected 5 V input, and a 3.3 V low-power MCU/sensor rail.

Layout Rules

mm

Yes

10mm

Top

deg

Properties

WiFi

USB-C

Consumer IoT

5

V

Bluetooth

Pricing & Availability

Distributor

Qty 1

Arrow

$4.00–$6.57

Digi-Key

$0.00

HQonline

$3.72–$3.82

LCSC

$5.53–$5.70

Mouser

$26.70

TME

$1.03

Verical

$5.26–$8.37

Controls