Open Authenticator

The Open Authenticator is an open source TOTP based hardware authenticator using ESP32. In layman’s terms, this does what Google Authenticator or Authy does. This uses a custom built pcb and a 3d case, also it uses a firmware built for this purpose using esp-idf, uses lvgl as the GUI library.

The features of open authenticator’s printer circuit board are:

• 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)

Media Coverage

• Hackster.io: TOTP-Based Open Hardware Authenticator Powered by an ESP32 Microcontroller

Project logs

• Hackaday: https://hackaday.io/project/176959-open-authenticator

Repositories

• PCB Design: https://github.com/Open-Authenticator/hardware-design
• Firmware: https://github.com/Open-Authenticator/open-authenticator-app
• 3D-Case: https://github.com/Open-Authenticator/3d-case

Components

• Bill of Material

Sponsors

• OSHPark - Thanks to OSHPark for sponsoring first prototype
• PCBWay - Thanks to PCBway for sponsoring the final prototype
• Asahitec - Thanks for discounts on stencil