RPi3 Wifi not working

JasperSlade

when attempting to configure my RPi3's wifi, it doesn't see any wireless networks. There are at least 7 wifi networks available that I can see from my Laptop/Tablet/Phone, but the RPi shows nothing. I'm not sure how to proceed. (I've tried rebooting both the RPi and my router obviously)

BuZz

please email buzz [at] exotica.org.uk the output of sudo iwlist wlan0 scan

JasperSlade

wlan0 No scan results

BuZz

I edited my post after making it - did you run it with sudo ?

JasperSlade

@BuZz
I did. It comes up with absolutely nothing. I'm wondering if the RPi's wifi is just plain dead.

BuZz

What PSU do you have ? (eg 5v 2a)

JasperSlade

@BuZz
I originally used: https://www.amazon.com/gp/product/B01DJZ17RC/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
advertised at 5v 2.5a I had retropie 3.7 at the time, but received the rainbow square indicating low voltage.
I now use: https://www.amazon.com/gp/product/B00PRJMYUI/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
also advertised as 5v 2.5a Using retropie 3.8 I get no rainbow squares.

BuZz

Please post the output of these commands (via pastebin.com or similar)

dmesg
cat /var/log/syslog

BuZz

@JasperSlade Also - run sudo raspi-config go to "Internationalisation Options" and set Wifi Country to "US" and see if that helps.

glennlake

@JasperSlade Check this out."https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md"

mjculross

Here's what I've used successfully (at home, at our radio clubhouse, & at work, just change the ssid & psk as appropriate):

//
// contents of /etc/network/interfaces
//

source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

allow-hotplug eth0
iface eth0 inet dhcp

pre-up wpa_supplicant -Wwext -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf -B

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

//
// contents of /etc/wpa_supplicant/wpa_supplicant.conf
//

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

network={
ssid="network SSID"
scan_ssid=1
proto=WPA2
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP
psk="network password"
}

BuZz

@mjculross https://retropie.org.uk/forum/topic/3/read-this-first (see the section on formatting and use a code block for your config)