Frode Bang

How to install the Edimax EW-7811Un WiFi adapter on the Raspberry Pi

Update (23.11.2013): In newer versions of Raspbian, this is a much simpler process.

If you’re using LXDE, you can probably skip all this and use the wpa gui application.

All you have to do is plug in your WiFi adapter and make some changes to /etc/network/interfaces

sudo vi /etc/network/interfaces

My interfaces file looks like this. I commented out three lines and added the third lines at the bottom.

 auto lo
 iface lo inet loopback
 iface eth0 inet dhcp
 allow-hotplug wlan0
 #iface wlan0 inet manual
 #wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
 #iface default inet dhcp
 iface wlan0 inet dhcp

Save the file and reboot.

sudo shutdown -r now

Hopefully you now have a working wireless connection.