please do:
$ cat /etc/config/wireless
You should see something like this:
config wifi-device radio0
option type mac80211
option channel 11
option hwmode 11ng
option path 'platform/ar933x_wmac'
option htmode HT20
list ht_capab SHORT-GI-20
list ht_capab SHORT-GI-40
list ht_capab RX-STBC1
list ht_capab DSSS_CCK-40
# REMOVE THIS LINE TO ENABLE WIFI:
option disabled 0
config wifi-iface
option device radio0
option network lan
option mode ap
option ssid Arduino
option encryption none
If you see this line
** **option disabled 0** **
, remove it.
Jesse