Objective Development Forums

V-USB states that "devices based on V-USB cannot comply to the electrical specifications of the USB standard because the AVR's I/O characteristics don't match the requirements of USB". Can someone elaborate on this? What specific characteristics of AVR's does the USB certification not agre...

I'm working on a project based on the EasyLogger project. My interface works great, but the sensor I'm attempting to power requires around 120mA. The total current requirement for my circuit is around 140mA. The problem, though, is that USB ports seem to not be sourcing more than 100mA of current. I...

On a similar note, even though some computers don't not recognize the device, should the computer display a notification at least acknowledging the USB device? The laptop on which the program works doesn't display anything. It just just starts typing the values on a word processor.

Hi all, So simple enough- I've replicated the V-USB EasyLogger project ( http://www.obdev.at/products/vusb/easylogger.html ) and it works on only select computers. It runs fine when plugged into my friend's Lenovo ultrabook, but it won't work on my desktop (Asus motherboard). I just get a notificati...