raspberry pi wpa_supplicant boot code example

Example 1: raspberry pi set wifi headless

crate a file in the root folder of the sd card ("boot") called 
wpa_supplicant.conf
===========contents of file:=================
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=

network={
 ssid=""
 psk=""
}

Example 2: raspberry pi wpa_supplicant

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

network={
     ssid="Your network name/SSID"
     psk="Your WPA/WPA2 security key"
     key_mgmt=WPA-PSK
}

Example 3: raspberry pi wifi setup wpa_supplicant

Create a file in the root of boot called: wpa_supplicant.conf (instructions below). Then paste the following into it (adjusting for your ISO 3166 alpha-2 country code, network name and network password):

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

network={
    ssid="NETWORK-NAME"
    psk="NETWORK-PASSWORD"
}

Example 4: enable wifi raspberry pi headless

Make new file /boot/wpa_supplicant.conf:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country="{Your countries' ISO 3166-1 code}" 

network={
 ssid="{Name of Network}"
 psk="{Password}"
}