How to Install an ATtiny Bootloader With Virtual USB

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Contributors: Shawn Hymel
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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

ATtiny84 and ATtiny84a 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:

Re-Programming the LilyTiny / LilyTwinkle

A quick tutorial showing how to reprogram the ATtiny85 IC found on the LilyTiny or LilyTwinkle boards.

Twinkling Trick or Treat Bag

Make a light up goodie bag with conductive thread, LEDs, and the LilyTwinkle!

Light Up Pennant with E-Textiles

Show your school spirit, geek pride, or fandom with a light up pennant using the LilyTwinkle or LilyPad Arduino.

SparkFun Qwiic RFID-IDXXLA Hookup Guide

The Qwiic RFID ID-XXLA is an I2C solution that pairs with the ID-LA modules: ID-3LA, the ID-12LA, or the ID-20LA, and utilizes 125kHz RFID chips. Let's take a look at the hardware used for this tutorial.