Joonas Pihlajamaa has created a USB dongle that enters and creates new passwords every time you plug it in. Every time he plugs it into a PC, it enters his password. Tap Caps Lock four times in succession, and it generates a new password ready for next time. It looks easy enough that I could do it, he says in a guide to Hack a Day. If you fancy having a go, he’s gives a full rundown of the process in this guide.”]
Source: https://gizmodo.com/how-to-make-your-own-usb-password-generator-dongle-5890796