USB-C WiFi BLE Sensor Node Design

flux

I’ll pause placement and run the DRC airwire check now, then summarize the remaining unrouted connections by net/component so we can decide what to route next.

flux

DRC airwire check found 57 unrouted airwires.
Main unrouted groups:
  • BUCK_SW / 3.3 V buck area: U2 SW/BST/FB, L1, C4/C5/C6/C7/C8/C10
  • 3V3 rail: U2, U3, U4, decoupling caps, I2C pull-ups, boot/strap/fault pull-ups
  • VBUS_RAW / VBUS_PROT: J1, D1, U1, C1/C2/C3, U2 VIN/EN
  • USB-C / USB data: CC1/CC2, D+/D− through U5 to ESP32-C3
  • ESP32 support: EN/reset, BOOT, GPIO2 strap, status LED, eFuse FAULT
  • GND stitching/returns: several GND-related airwires remain, including one stitching via connection
Board status:
  • Components are already placed on the top layer.
  • Board is currently 160 × 100 mm, 4-layer, with very low density (~3.7% component fill), so routing space is generous.
Next step should be routing, but per checkpoint I’ll wait for your approval before running auto-route.
Route buck loop
List airwires
Separate DRC issues
Route USB pair
Add stitching vias
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Doc 1

Documents

    Doc 1

    Project Specification

    Power Budget Analysis

    Firmware Starter — ESP32-C3-MINI-1-N4

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USB-C WiFi BLE T-RH Sensor Node

USB-C WiFi BLE T-RH Sensor Node thumbnail
Low-power USB-C 5V environmental temperature/humidity sensor node with Wi-Fi 2.4GHz b/g/n and BLE 5.x connectivity, protected 5V input, and 3.3V digital sensor/MCU rail.

Properties

USB-C power/programming connector; optional status LED and reset/boot buttons

USB-C 5V default sink input; design power path for 0.5A to 3A sources with reverse, OVP, UVLO, and OCP protection before 3.3V regulation.

5

V

Consumer use; choose RoHS/REACH parts where available; RF layout must preserve antenna keepout.

Consumer Electronics

2.4GHz Wi-Fi 802.11 b/g/n and Bluetooth Low Energy 5.x

Environmental node using ultra-low-power Wi-Fi/BLE MCU module, I2C digital temperature/humidity sensor, USB-C CC pull-downs, input protection, 3.3V regulator, decoupling, boot/reset support, and I2C pull-ups.

Pricing & Availability

Distributor

Qty 1

Arrow

$3.73–$5.31

Digi-Key

$2.59–$3.26

HQonline

$6.22–$6.25

LCSC

$10.63–$10.67

Mouser

$8.72

TME

$1.69

Verical

$4.96–$7.25

Controls