Raspberry Pi Forums

Posted: **Thu Mar 09, 2017 9:29 am**

The wifi link doesn't come up on my newly purchased Rapsberry Pi 0 W.

Situation:

new raspberry pi zero W
new SD card with noobs, raspbian installed

/etc/network/interfaces:

auto lo
iface lo inet loopback

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
     wpa-ssid "<my ssid>"
     wpa-psk "<my pwd>"

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ip link show

shows only lo interface

when trying

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sudo ifup wlan0

, output is:

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wpa_supplicant: /sbin/wpa_supplicant daemon failed to start
run-parts: /etc/network/if-pre-up.d/wpasupplicant exited with return code 1
Failed to bring up wlan0.

When I insert the same SDcard in a Raspberry Pi 3 I have here, this works fine, and the pi connects to the network using Wifi without any problems.

Thank you in advance for any pointers to what I should/could do to fix this.

Posted: **Thu Mar 09, 2017 9:45 am**

https://www.raspberrypi.org/documentati ... ess-cli.md

should give the information you need.

Posted: **Thu Mar 09, 2017 9:50 am**

I should check that you have the very latest version of NOOBS as well.
PeterO

Posted: **Thu Mar 09, 2017 9:57 am**

Thanks for your reaction!

Unfortunately, the first cmd on that page

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sudo iwlist wlan0 scan

gives the following output:

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wlan0      Interface doesn't support scanning

Posted: **Thu Mar 09, 2017 9:58 am**

PeterO wrote:I should check that you have the very latest version of NOOBS as well.
PeterO

Yes, I updated the noobs using the (working) raspberry pi 3.

Posted: **Thu Mar 09, 2017 10:00 am**

teufen wrote:Thanks for your reaction!

Unfortunately, the first cmd on that page
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sudo iwlist wlan0 scan
gives the following output:
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wlan0      Interface doesn't support scanning

Just ignore that section and keep reading.

Posted: **Thu Mar 09, 2017 10:16 am**

I read the article, and moved the wpa information from /etc/network/interfaces to /etc/wpa_supplicant/wpa_supplicant.conf and added a line to source that file in /etc/network/interfaces, which is now:

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auto lo
iface lo inet loopback

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
#     wpa-ssid "<my ssid>"
#     wpa-psk "<my pwd>"
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

/etc/wpa_supplicant/wpa_supplicant.conf:

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

network={
      ssid="<my ssid>"
      scan_ssid=1
      psk="<my pwd>"
}

But it didn't do the trick.

Posted: **Thu Mar 09, 2017 10:27 am**

Maybe you should put a new image on your card and start all over again.
Getting the Pi 0 W to use wifi is very simple:
1) create a wpa_supplicant.conf file and put it in /boot. (/boot/wpa_supplicant.conf)
2) create an empty ssh file in /boot

I did this on a new image and this is my interfaces file:

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pi@raspi4:~ $ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

iface eth0 inet manual

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

allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

and this is the wpa_supplicant conf:

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pi@raspi4:~ $ sudo cat /etc/wpa_supplicant/wpa_supplicant.conf
country=DE
network={
    ssid="XXXXXX"
    psk="XXXXXXXXXXXXXXXXX"
    key_mgmt=WPA-PSK
}

Posted: **Thu Mar 09, 2017 10:31 am**

For more information see here: https://www.raspberrypi.org/blog/anothe ... -raspbian/

Posted: **Thu Mar 09, 2017 10:45 am**

Ernst wrote:Maybe you should put a new image on your card and start all over again.

OK, I'll try that.

Funny thing is still that Wifi with the same SDcard in a Rapsberry Pi 3 works fine.

Posted: **Thu Mar 09, 2017 1:30 pm**

teufen wrote:
Ernst wrote:Maybe you should put a new image on your card and start all over again.
OK, I'll try that.

OK, that worked.

Thanks again for helping me out!

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