I am trying to implement a simple USB interface using ATTINY85. I know USB is not natively supported for this chip, but V-USB claims to do this at the software level. Although I can get their example codes to compile and flash the chip without any trouble, the interface is not being recognized when plugged into Windows 10. I have checked my clock on an oscilloscope and it is within the required specs. I would have posted this question on V-USB forum, but most of the discussions there seem to be circa 2010, more than 10 years ago. I am not sure if there is a better way to implement USB interfaces on these chips. Any suggestions?