Adding Pi Zero to the mix


Just got a Pi Zero up and running Raspbian Lite.

This tells you how to boot without anything other than a PSU !!

Basically you build an image with a wpa_supplicant.conf file in /boot
and also an empty ssh file to enable ssh

Well it saves having to buy Micro HDMI cables!

and you don’t even need a mains PSU … .

Now trying to add the audioinjector card.

Edited /boot/config.txt

# Uncomment some or all of these to enable the optional hardware interfaces

# Uncomment this to enable the lirc-rpi module

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
# dtparam=audio=on

# Soundcard Config

And there we have it :smiley:

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: audioinjectorpi [audioinjector-pi-soundcard], device 0: AudioInjector audio wm8731-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

It’s amazing how quickly you forget this stuff. . .

Mind you …

aplay Deathwish.wav
Playing WAVE 'Deathwish.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

Followed by . …

aplay: pcm_write:2011: write error: Input/output error

So a quick visit to the audio injector forum . . . .
Turning on Audio Mixer

In this case, as “Output Mixer HiFi” is not enabled, ALSA will not playback and has a write error.
To fix, open alsamixer from the command line and use the right/left arrows to highlight the “Output Mixer HiFi” control. Once highlighted press “m” to mute or enable this control.

And we have Music!!!


The later is done by the webconf btw, if you select Audioinjector as sound card.

What happens, if you use the normal Zynthian image? Is the zero that different?


I wanted to try a base metal approach because I’m also doing other bits and pieces with PyCharm and I am looking at using it as a dev environment.

The Real plus is I know I can play audio on the AudioInjector powered by Battery Pack.
I tried this before with a Pi & it generally under-voltaged.
I’ve also satisfied myself that WiFi zero is a reliable starter and behaves consitantly enough with boot up.
The LED don’t come on unless you have a decent operating system on the card.

So I should be able to zynthianize it now.
The default zynthian is wifi off isn’t it?
If so I need to rig the wpa_supplicant.conf on the way in.

Well I’ve taken the zynthian-nord card ( A Pi3 with Audio Injector)
added appropriate wpa_supplicant.con & ssh files

and put it in the Pi zero machine.
It boots ( well the green light flashes on and off)
but I can’t get an ssh terminal . . .

and no zynthian-nord.local webconf.