[Jenna] sent in a very cool bootloader she thought people might like. It’s called Micronucleus and it turns the lowly ATtiny 85 into a chip with a USB interface capable of being upgraded via a ‘viral’ ...

There are a few different ways of getting firmware onto one of AVR’s ATtiny85 microcontrollers, including bootloaders that allow for firmware to be updated without the need to plug the chip into a ...

You get ATtiny85 with usb connector as very cheap module on aliexpress. To programm that thing without a programmer you need to burn a (small) bootloader. After burning it, pressing reset (GND to p5) ...