Where do you miss it? It should be present in Volumio 3.x after a clean install on your Pi. If you miss it in a Raspbian distro you might want to refer to the IQ Audio manual
Hello
I also have the problem of Missing IQAudio Digi+ Card on Volumio 3
I have been trying to fix this problem myself with so far no success.
I have found the dacs.json file in the file system and to my eyes it looks the same as in the Documentation/ other forum post about testing DACs for inclusion. (Small typo/ missng peramiter?)
So from my simple view it looks like it should work but is missing from the I2s dropdown list.
There ae several versions online for the Digi+ manual
Version 30 Includes the Digi+ Later versions do not.
https://wiki.geekworm.com/images/4/42/IQaudIO.pdf
I have followed the instructions, but I have either Bricked the system, or failed to work. Not entirely sure why.
I note that a HifiBerry Digi card also with the wm8804 chipset is also causing problems. Maybe the two are linked?
Thanks
Richard
PS I couldnt find this post searching easily for iqaudio or IQaudio or IQaudiO. Baffled.
There should be 3 IQaudio items in the drop down list. According to the dacs.json file
One of which is the Digi+ which uses a different chipset to the other two. It provides a Toslink (which I use) and Coax output.
I seem to have bricked my system & corrupted my SD card now with my fiddling 
I had a fresh look just before it failed between th system dacs.json the Documentation & V3 beta test help Post. I may have spotted a difference. And then It went wrong…
Fresh head needed!
Fresh system take 4.
Two IQaudio dacs shown, neither of which are for the PI-Digi+
Checked the dacs.json file in the system & documentation
System File
{"id":"iqaudio-dacplus","name":"IQaudIO DAC Plus","overlay":"iqaudio-dacplus,unmute_amp ","alsanum":"2","alsacard":"IQaudIODAC","mixer":"Digital","modules":"","script":"iqamp-unmute.sh$
{"id":"iqaudio-digiplus","name":"IQaudIO Pi-Digi+","overlay":"iqaudio-digi-wm8804-audio","alsanum":"2","mixer":"","modules":"","script":"","needsreboot":"yes"},
{"id":"iqaudio-amp","name":"IQaudIO Pi-DigiAMP+","overlay":"iqaudio-dacplus,unmute_amp ","alsanum":"2","alsacard":"IQaudIODAC","mixer":"Digital","modules":"","script":"iqamp-unmute.sh"$
Documentation
{"id":"iqaudio-dacplus","name":"IQaudIO DAC Plus","overlay":"iqaudio-dacplus,unmute_amp ","alsanum":"2","mixer":"Digital","modules":"","script":"iqamp-unmute.sh","i2c_address":"4c","needsreboot":"no"},
{"id":"iqaudio-digiplus","name":"IQaudIO Pi-Digi+","overlay":"iqaudio-digi-wm8804-audio","alsanum":"2","mixer":"","modules":"","script":"","needsreboot":"yes"},
{"id":"iqaudio-amp","name":"IQaudIO Pi-DigiAMP+","overlay":"iqaudio-dacplus,unmute_amp ","alsanum":"2","mixer":"Digital","modules":"","script":"iqamp-unmute.sh","needsreboot":"yes"},
Both of which clearly show the IQaudio Pi-Digi+ as well as the other two. Baffled. And the differences I spotted last night were for the other two DACs, which are showing in the system. More baffled. I was hoping to spot a silly typo etc.
I think I have run out of ability/understanding to progress further. I guess I should fire up a volume 2 install and have a look there next.
Help & suggestions welcome please!
The “iqaudio-digi-wm8804-audio” is missing the “alsacard” setting, that is why it will not be listed.
The alsacard value should be “IQaudIODAC”, identical to the other two.
Like this:
{"id":"iqaudio-digiplus","name":"IQaudIO Pi-Digi+","overlay":"iqaudio-digi-wm8804-audio","alsanum":"2","alsacard":"IQaudIODAC","mixer":"","modules":"","script":"","needsreboot":"yes"},
That won’t help you much 
With V3 all card entries in dacs.json must have an “alsacard” setting.
Thanks gkkpch.
I now have the IQaudio Pi-Digi+ shown in the drop down menu. 
Sadly, it still doesnt work. 
I now get an error
ALSA failed to open “volumio”; no such device.
More to investigate.
Whilst fiddling I noticed that the ST400 DAC Also calls the IQAudio Digi+ Information, so I tried that, and sadly that also fails with the same error (which may be expected but I thought I would try)
And I had just finished writing V2 SD card when I read this. Great timing 
Did you reboot?
Yes.
I made the changes.
Reboot system.
Selected IQaudio Pi Digi+
System Reboots
Tried & failed
Checked my changes & rebooted again
Still fail
Select headphones audio works
Reselect Iqaudio
Reboot
Still fail
Reboot again
Still fail
It has just occurred to me that my system also has a Pico UPS HAT on it. It hasn’t caused problems with V2. But I have not tried to physically remove it yet either, in case there is a conflict of some kind in V 3
I have a similar problem and would love a proper solution.
But I found that selecting R-PI DAC at least seemed to allow ALSA to playback audio - but not sure if this is the best option.
2 Likes
After a interlude with far too much food, I’m back to fiddling.
Happy new year folks!
I have disconnected the UPS board, so I now just have a Pi & IQaudiO Digi+ board.
Sadly the same ALSA No Volumio device fault.
Log file >
http://logs.volumio.org/volumio/BjasaiG.html
Quite a few errors in the log file. I can spot some of the symptoms, but not sure about much of the causes, as I don’t understand enough. Ill carry on digging though.
Any hints very welcome!
Wheaty
just some thoughts:
open /boot/config.txt and make the following change:
from: dtparam=audio=on
to: #dtparam=audio=on
if the line dtoverlay exist in /boot/config.txt, disable it:
from: dtoverlay=iqaudio-digi-wm8804-audio
to: #dtoverlay=iqaudio-digi-wm8804-audio
open /boot/userconfig.txt
add: dtoverlay=iqaudio-digi-wm8804-audio
Execute the following commands:
sync
sudo reboot
after reboot type the following in the terminal (don’t configure anything in Volumio yet)
aplay -l
Is the soundcard listed?
Yes. I don’t think it has been in the past.
**** List of PLAYBACK Hardware Devices ****
card 0: IQAudIODigi [IQAudIODigi], device 0: IQAudIO Digi HiFi wm8804-spdif-0 [I QAudIO Digi HiFi wm8804-spdif-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
I have tried similar to your suggestions previously, but that was before I modified the dacs.json file & bricked the system again. I want keeping good enough track of the trial and error clearly.
Unfortunalty still having the failed to open alsa no such device error still. 
Sorry to hear. Since I don’t have this hardware I have no other suggestions.
Amusing fiddling find…
The AlloDigiOne driver gives optical audio (its a Coax S/PDIF board)
However the timing is different. The audio is approximatly 1.5times faster. Everything I play sounds like some enthusiastic, but talented chipmunks are giving it ago! 
Still not made an real progress though.
I am curious how this will sound in your case:
2 Likes
credit to those that have assisted in this thread above. Thank you! I’ve basically just worked my way through a few options and tried to remember my was around Linux
Ah HA!
I have a work around, which is surprisingly simple, yet slightly different to what I have tried before. My last attempt stopped the Playback options page from loading, it was just blank. No idea how I did that.
So From my umpteenth fresh install I have…
1)Enable SSH via volumio.local/dev
Im assuming you know how to SSH into your Pi.
2)edit dacs.json
Location /volumio/app/plugins/system_controller/i2s_dacs/dacs.json
Use nano to edit the file.
Find the line for iqaudio-digiplus and add this like the other IQaudiO lines.
“alsacard”:“IQaudIODAC”
The modified lineshould look like this.
{“id”:“iqaudio-digiplus”,“name”:“IQaudIO Pi-Digi+”,“overlay”:“iqaudio-digi-wm8804-audio”,“alsanum”:“2”,“alsacard”:“IQaudIODAC”,“mixer”:"",“modules”:"",“script”:"",“needsreboot”:“yes”},
open /boot/config.txt and make the following change:
from: dtparam=audio=on
to: #dtparam=audio=on
Hash out your existing dtoverlay and add the correct one for the Digi+ with the wm8804
hash: #dtoverlay=iqaudio-dacplus
add: dtoverlay=iqaudio-digi-wm8804-audio
- Execute the following commands:
sync
sudo reboot
My Pi 2 then failed to reboot. So I had to pull the plug .
Check
aplay-l
Mine looks like this.
volumio@pifi:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: IQAudIODigi [IQAudIODigi], device 0: IQAudIO Digi HiFi wm8804-spdif-0 [IQAudIO Digi HiFi wm8804-spdif-0]
Subdevices: 0/1
Subdevice #0: subdevice #0
volumio@pifi:~$
IQaudio Digi is now listed as a device! Woo! 
Downside is from the web interface, when selected from the dropdown list it still fails to play 
However, I tried to go back to the headphone output, and the only option listed now is the IQaudio Digi+
Which plays! Hooray! 
So. for now Im a happy chap. Full digital to my Amp with then does the hard part. Fab And its only ever so slightly different from all the combinations I have tried before. Typical!
Hopefully, this will ring some alarm bells for the Devs, as it feels to me like an easy fix/minor glitch in the code.
So for now, I hope this is a temporary fix for others.