AVR-Chat

> hello friends,
> 
> i want to use USB for interfacing some basic testing
> hardware like LED,LCD or keypad etc.but i don't know anything 
> about USB interfacing. For example ,i want to interface led 
> using USB power.How can i do it? & what type of software tool 
> i will need for this?
> 
> please give me idea,if anybody know about it.

Have a look at this website:

http://www.obdev.com/products/avrusb/index.html

I have assembled a version with a Mega48 to do USB to TTL 3.3V UART serial
and it seems to work ok if I connect it directly to the USB port on my
notebook but it won't work with a USB hub :(

YMMV

Alex Shepherd