open-authenticator / hardware-design

Hardware design files for open authenticator

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