Compact PCB Design for WINO

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Design Notes
WINO architecture decisions
  • Board size target: 60 mm x 40 mm.
  • Stackup target: 2-layer PCB with all components on top and solid bottom ground plane.
  • Main MCU: ESP32-S3 with native USB used for programming over USB-C.
  • Cellular modem: SIM800L powered directly from LiPo battery rail.
  • GPS: NEO-6M module with external antenna connector.
  • Sensors: MPU-6050 and MAX30102 on shared 3.3 V I2C bus.
  • I2C pull-ups: 4.7 kOhm to 3.3 V on SDA and SCL.
  • Logic rail: AP2112K-3.3.
  • Battery charging: single-cell LiPo charger from USB-C 5 V input.
  • USB-C sink configuration: CC1 and CC2 each use 5.1 kOhm pulldown resistors to GND.
  • SIM800L control: GPIO-driven PWRKEY and reset wiring, UART link to ESP32-S3.
  • Placement constraint: keep SIM800L physically isolated from GPS and I2C sensors.
  • Routing constraint: keep I2C and UART traces short and direct.

    WINO architecture decisions

Documents

    design-notes

    Project Specification

Assets

Assets are files uploaded to this project which can be used in various ways.

WINO Child Safety Wearable thumbnail
Compact 60 mm x 40 mm child safety wearable PCB with ESP32-S3, SIM800L GSM, NEO-6M GPS, MPU-6050, MAX30102, USB-C charging/programming, LiPo battery input, and test-pointed I2C/UART power rails. Target layout is 2-layer with all components on top, bottom ground plane, short direct I2C/UART routing, and GSM placement isolated from GPS and sensor sections.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$0.61–$0.66

Digi-Key

$1.04–$1.57

LCSC

$1.94

Mouser

$1.70

TME

$0.90

Verical

$1.23–$1.98

Controls