Software usb-uart on attiny?

Question

Do it yourself

Tell the beginner, is it possible to sew up a software usb-uart in attiny? If so, is there still room for your own software? I'm thinking how to build a 1-wire to usb converter.

Answer 1

Really! V-USB and USBtiny to the rescue.
And there seems to be enough space for littlewire.cc :-)

Answer 2

AVR309: ​​Software Implementation of the Universal Serial Bus (USB)
There is truth for the atmega.