Setting up WiFi Adapter on a Raspberry Pi
sudo nano /etc/network/interfaces
===========
auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp
==============
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
===============
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="YOUR_NETWORK_SSID"
psk="YOUR_NETWORK_PASSWORD"
key_mgmt=WPA-PSK
}
================
sudo service networking restart