A watchdog running V-USB on an Attiny85 that identifies itself as a USB keyboard and sends keyboard strokes.
In WTCHDG mode, kbdwtchdg listens for the capslock trigger to occur during WTCHDG_INTERVAL. If no trigger occurs, the text is written. If a trigger occurs, the timer is reset.
After receiving the capslock trigger and waiting for DELAY time the text is written.
If first_start is set the text is written after INITIAL_DELAY after power up.
The repo contains an AtmelStudio 7 project file that is preconfigured for kbdwtchdg.
Documentation can be found here.
The code of this project is based on Frank Zhao's USB business card and built based on Dovydas R.'s circuit diagram for usb_pass_input_with_buttons.