Method for configuring Wifi SSID / PSK on Raspberry Pi (Headless)

1. Create “SSH” file (no extension) in SD card root
2. Create “wpa_supplicant.conf” file with config below
3. Insert SD card into Raspberry Pi and reboot – BOOM job done.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB

network={
     ssid="your_network_name"
     psk="your_wifi_password"
}