Finally got the Edimax Nano (EW-7811Un) setup on my Raspberry Pi. Last year I could not get it working but it appears that newer versions of the Raspbian Wheezy image might have simplifed the config. The following instructions worked with the 7/26/2013 Raspbian image (can’t speak for older or newer versions) and WPA (Did not try it for WPA2).

  • Plug in the adapter and reboot.
  • Check that the device is showing up (Note the last entry):
pi@raspberrypi ~ $ lsusb
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. 
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
  • Edit the /etc/network/interfaces file as follows and reboot:
auto lo

iface lo inet loopback
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ssid "my ssid"
wpa-psk "my wifi password"
  • See if you’re connected and getting an IP, a blue light should be flashing on the adapter:
pi@raspberrypi ~ $ ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr 80:1f:02:70:7d:b1  
          inet addr:  Bcast:  Mask:
          RX packets:911 errors:0 dropped:1014 overruns:0 frame:0
          TX packets:444 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:123537 (120.6 KiB)  TX bytes:74644 (72.8 KiB)


  • See if you can scan for available networks, if so you might have your ssid or password set incorrectly:
pi@raspberrypi ~ $ sudo iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 08:60:6E:E8:DD:64
                    Protocol:IEEE 802.11bgn
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
  • Try plugging the adapter into the other USB port on the pi. Was having a terrible time getting it to work, did this and voila!
  • Make sure you are plugged into a powered hub. I guess this can be a problem as the adapter draws more current than some ports can provide. If you don’t see the blue light flashing on the adapter this might be the issue.
  • Hit the pi add-ons forum. And don’t ask me in the comments because I’m just as clueless as you.