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HID-Button-ATTiny85

Introduction

The HID-Button-ATTiny85 is based on the ATTiny85 board and acts as an automatic keyboard replacement which types credentials into a Windows (or similiar) login request with just a single button press.

Hardware

  • ATTiny85 USB or compatible like a DigiSpark USB (clone) with already installed Micronucleus bootloader
  • A regular pushbutton of your choice
  • Circuit:
    Circuit
  • Wiring:
    Wiring

Manual / Remarks

  • Install the USB drivers to be able to upload your sketches via USB
  • Add in Arduino IDE preferences the Board Manager URL for ATTinyCore http://drazzy.com/package_drazzy.com_index.json (see https://github.com/SpenceKonde/ATTinyCore for details):
    Boardmanager-URL
  • Choose Board and Arduino IDE Settings as shown here:
    Arduino IDE Settings
  • Extract zip archive "Bounce2.zip" to C:\Users<YOURUSERNAME>\AppData\Local\Arduino15\libraries
  • Extract zip archive "DigisparkKeyboard-master-fixed.zip" to C:\Users<YOURUSERNAME>\AppData\Local\Arduino15\libraries
  • Extract the content of DigisparkKeyboard-master-fixed.zip to C:\Users<YOURUSERNAME>\AppData\Local\Arduino15\libraries before compiling
  • Before uploading the INO sketch to the board you must change in Credentials.h the login credentials USER|PASSWORD pairs to the desired real credentials
  • If only a password input is needed leave the according USER value in Credentials.h empty
  • Optional: if a hardware reset is needed for your board you can connect PB5 with a pushbutton to GND (but recommended is to use the builtin software reboot with button press)
  • Optional: you can upgrade the ATTiny85 bootloader with the UpgradeBootloader.bat script within the bootloader folder

Usage

  • Press the button shorter than 1 second to type credentials pair 1 as login
  • Press the button between 1 and 5 seconds to type credentials pair 2 as login
  • Press the button longer than 5 seconds to reboot the HID-Button

Known Issues

  • If the HID-Button-ATTiny85 is already plugged at start of the PC or during a restart it will not properly work, this issue can be solved by replugging

License / Copyright

The HID-Button-ATTiny85 is licensed under GPL-2.0-only.

© Alexander Feuster 2024