Open Authenticator Hardware Design

This repository contains hardware design files and datasheets for the open authenticator. This project is in development and is not ready for release.

Features

• Small form factor of 82mm x 42mm
• Uses ESP32-WROOM-32D module
• Uses 128x64 0.96" inch OLED panel
• Uses DS3231 RTC with battery backup (CR2032) for timekeeping
• Powered by 3.7V 300 mAh LiPo battery
• Uses MCP73831 for charging LiPo battery
• Uses TPS63001 Buck Boost Converter IC for efficient 3.3V power supply, with input range from 1.8V - 5.5V
• Uses TPS22919 Load switch to control power to OLED and RTC chip
• Autoselect power source, i.e., battery or USB
• USB Type-C for charging only (no data pins connected)

Project Structure

/datasheets - contains datasheets of various components used in the pcb
/kicad_project - contains kicad project files for the pcb
/schematics - contains schematics of the the pcb

Tools

To view/modify the files from this repository, install KiCAD from: https://kicad.org

Schematics

Plots

Front side

Back side

Credits

Thanks to OSHPark for sponsoring first prototypes

Thanks to PCBway for sponsoring the final prototypes