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Once the bootloader and board definition files are in place, you can send compiled programs over USB directly to the ATtiny84. You'll just have to select the correct bootloader object (.hex) file, change which fuses you burn, and make a few changes to the boards.txt and platform.txt files in Arduino. ![]() The good news is that this process should work for other ATtiny microcontrollers that micronucleus supports, including the ATtiny85, ATtiny841 and ATtiny167. This meant having to go through the process of loading the micronucleus bootloader onto the ATtiny84, changing some fuses, and writing a custom board definition in Arduino.Īll that does not seem so bad, but it is a fairly lengthy process just to get a bootloader onto a single chip. While this is not anything new (the Digispark from Digistump does the same thing), I needed a bootloader with virtual USB for the Atmel ATtiny84, as it offered more pins over the ATtiny85. Attiny85 digispark reprogramming pro#
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