how too make usb with LED Indicator

Hello people

I found long a go something that was a led that flashing on the data transfer from a usb
so i can't find it now so can you help me out?

i try something todo but its not working

i buy a usb hub and made npn with led on it if you Base Volts up than you led goes on.
now i add the base on the data line on a usb of that usb hub
but there is no effect...

can somebody help me?

caitlinsdad5 years ago
I dunno, but some usb hubs are not powered or do not provide a full voltage to the power lines. You would need to check with a voltmeter and if your circuit depends on it.