wpa_supplicant settings for wpa-psk

dave@transformer:~$ cat /etc/network/interfaces

auto lo
iface lo inet loopback
auto wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

dave@transformer:~$ cat /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=2

network={
    ssid="my_network"
    psk="my_password"
    scan_ssid=1
    proto=WPA
    pairwise=TKIP
    group=TKIP
        key_mgmt=WPA-PSK
}