It will not work when plugged into an USB3 port. It is marginal for USB ports following older standards and may occasionally not work. Putting an old USB hub be

It will not work when plugged into an USB3 port. It is marginal for USB ports following older standards and may occasionally not work. Putting an old USB hub between the computer and the AVR device can help with the connection. It's a neat hack though: https://www.obdev.at/articles/implementing-usb-1.1-in-firmware.html https://www.obdev.at/articles/implementing-usb-1.1-in-firmwa... The utility of it diminished with the availability of AVR devices with integrated USB peripherals. There's LUFA to help with their use: http://www.fourwalledcubicle.com/LUFA.php http://www.fourwalledcubicle.com/LUFA.php