USB-C WiFi BLE Sensor Node Design

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Completed so far:
  • Renamed the project to USB-C WiFi BLE Environmental Node and updated the description/properties.
  • Selected and added the main schematic parts:
    • U1 ESP32-C6-WROOM-1-N8 WiFi/BLE MCU module
    • U2 SHT40-AD1F-R2 temperature/humidity sensor
    • J1 USB4215-03-A USB-C receptacle
    • U3 TPS25940LRVCR eFuse for reverse/OVP/UVLO/OCP protection
    • U4 AP2112K-3.3TRG1 3.3 V LDO
    • USB data ESD protection, VBUS TVS, BOOT/RESET buttons, and status LED
  • Checked the key datasheet requirements:
    • ESP32-C6 needs 3.0–3.6 V supply, 0.5 A-capable 3.3 V rail, EN RC delay, USB on IO12/IO13, and antenna keepout later in layout.
    • SHT40 needs 1.08–3.6 V, I2C pull-ups, and 100 nF decoupling.
    • TPS25940 supports 2.7–18 V input, programmable UVLO/OVP/OCP, true reverse blocking, and needs resistor dividers/current-limit/dVdt components.
    • AP2112K needs input/output capacitors and supports 600 mA output.
Remaining work:
  • Add the passive support parts: decoupling, bulk caps, USB-C CC 5.1 kΩ pull-downs, eFuse divider/current-limit/dVdt parts, I2C pull-ups, EN RC, LED resistor.
  • Wire all power, ground, USB, I2C, BOOT/RESET, and protection nets.
  • Run ERC/review and fix violations.
  • Create the power-budget, firmware starter, and board bring-up documentation.
  • After schematic verification, ask for your approval before moving to layout.
Add passives and wiring
Set USB-C defaults
Document power budget
Run schematic review
Calculate eFuse values
U3
J1
U1
U4
U2
LED1
SW2
SW1
D1
D2

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    USB-C WiFi BLE Environmental Node

    USB-C WiFi BLE Environmental Node thumbnail
    Consumer USB-C powered low-power environmental sensor node with WiFi/BLE MCU, digital temperature/humidity sensing, USB-C 5 V input, and input protection for 0.5–3 A sources.

    Properties

    USB-C sink, default 5 V; designed for 0.5–3 A capable sources with eFuse current limiting and 3.3 V regulation

    Consumer/indoor environmental monitoring target; components selected with industrial-rated margins where available

    Consumer environmental sensor node

    USB-C 5 V input; protected 5 V rail; regulated 3.3 V logic rail

    2.4 GHz Wi-Fi 802.11 b/g/n/ax-capable module operated for b/g/n compatibility plus BLE 5.x; USB 2.0 native programming/data

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $1.96–$3.12

    Digi-Key

    $5.91–$6.76

    HQonline

    $0.43–$0.58

    LCSC

    $9.36–$9.66

    Mouser

    $12.33

    TME

    $7.30

    Verical

    $2.81–$5.52

    Controls