Edimax EW-7811UN USB problem

2 posts
by Martwana » Mon Dec 17, 2012 9:24 pm
Hi again, second post :)

It'll just jump straight to it. Model B 512MB and Wheezy installed.

Bought the edimax adapter, model in the title, and when I plug it in, along with my USB keyboard, the USB ports seem to die.

When pi is booting and I can see verbose boot stuff, it does recognise my keyboard, and I can hit num lock for example and it works(light comes on) but but the time the pi has got to the login prompt, both the keyboard and wifi adapter are dead.

Works fine without the adapter, and power isn't an issue, runs off my iPad charger just now at 2.1A 5V.

Anyone had this issues or found the fix?
Posts: 30
Joined: Sun Dec 16, 2012 1:12 pm
by Martwana » Thu Dec 20, 2012 4:21 pm
Turns out it was a power supply problem, well power cable.

For some reason, the usb cable i was using dropped the voltage down from the 4.9vish the charger put out to 4.1v.

I presume that the Pi simply couldn't operate a wifi adapter with insufficient power supply.
Posts: 30
Joined: Sun Dec 16, 2012 1:12 pm