Tiniest USB development board with Micronucleus

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https://www.electronics-lab.com/tiniest-usb-development-board-micronucleus/

Development board for the ATtiny84a with USB connector. Pre-loaded with the Micronucleus bootloader compatible with Arduino. DIP version with USB connector of the ATtiny84a. The board can be placed in the middle of the breadboard. Sketches can be uploaded from Arduino using the Micronucleus bootloader. There is an indicator LED to determine if the board […]

Installing The Micronucleus Bootloader To An ATtiny Via Arduino

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https://www.electronics-lab.com/installing-the-micronucleus-bootloader-to-an-attiny-via-arduino/

In order to be able to upload Arduino sketches directly to the ATtiny84 over USB without the need to use a programming device, Shawn Hymel, an electrical engineer at Sparkfun Electronics, had published a guide showing how to install the micronucleus bootloader, which supports virtual USB (V-USB), onto an ATtiny84 using Arduino. The Atmel AVR […]