How to Install an ATtiny Bootloader With Virtual USB
Contributors:
Shawn Hymel
Shawn Hymel 
Resources and Going Further
While this is a lot of information to take in, it shows how to hack the Arduino IDE to load custom board definitions. These steps should work for other ATtiny devices that are supported by the micronucleus project, such as:
You might have to modify the pins_arduino.h file, however, if you plan to use a different ATtiny.
ATtiny84 Pinout
If you need additional support, please check out the following resources.
If you want to go further with the ATtiny, please check out our additional tutorials that showcase the ATtiny:
Qwiic Keypad Hookup Guide
If you are tired of taking up GPIO pins, wiring a bunch of pull up resistors, and using firmware that scans the keys taking up valuable processing time... check out the new Qwiic Keypad.
Re-Programming the LilyTiny / LilyTwinkle
A quick tutorial showing how to reprogram the ATtiny85 IC found on the LilyTiny or LilyTwinkle boards.
LilyTiny Plush Monster
Craft a stuffed monster while exploring the LilyTiny preprogrammed microcontroller. This is a project based on the Plush Monster Activity created at MIT's High-Low Tech Lab by Emily Lovell, Jie Qi, and Natalie Freed.
Night Sky Halloween Costume
Make a beautiful night sky costume using the LilyPad LEDs and the LilyTiny.