On Tuesday, April 21, 2020, 03:22:21 PM CDT, udo noll <un@aporee.org> wrote:

Zach Poff:
> Just to be clear, how did you connect the EM172 pair?

it's a bit confusing.
the codec+ board http://iqaudio.co.uk/hats/100-pi-codec.html
has only one 3.5mm jack, but mine has two. got it 6 month ago from
IQAudio for testing. I asked them today, and they said, that most people
don't need two mics, but in case they would provide another jack on
demand".

So then you would have 2 mono mic inputs, means either a Y-cable or each
Primo in its own jack.

the codecZero board has one 3.5mm jack, which they say is mono, but
actually is stereo. I asked, the answer was:

"I’ve not reached the end of investigation into the different volume on
each channel. So we market it as mono. :-) "

And in fact, I was a bit to quick, you have to set different values in alsamixer
for balanced levels on both cards.

so, what you can hear at http://radio.aporee.org:8000/live.m3u
is a pi3 + codecZero, 2 Primos connected to one stereo 3.5mm jack.
both channels 18dB gain, but slightly different settings
in alsamixer. don't want to spam the list with amixer output...

hope I'm not contributing to the confusion ;)

bests, udo



>
> I see that Mic2 is a mono 3.5mm jack that disables the onboard MEMS, but
> where is the input for Mic1?
>
> The guide says "Supports additional (no fit) Mono Electret microphone
> (Mic1 right)" (p28)
>
> -Zach
>
> On 2020-04-21 14:57, udo noll wrote:
>
> > hi Garth:
> >
> > > Thanks for posting this - I have had a Pi3B running with the Cirius board for several years (maybe 4 or 5 now), but I am moving it into a solar charged enclosure so I can move it away from the power source and make it more autonomous.  I have used Pi Zeros for other installation applications but was not thinking about it in this application - however due to the reduced power consumption it would make sense for me to change me entire setup to a PiZero with the IOAudio board and so I am wondering if you have any details on how you got the PiZero working for Locusonus stream
> >
> > as said, I don't have Pi zero experience yet. What you've listend to is
> > a Pi3 + the IQAUdio Zero board: http://iqaudio.co.uk/hats/101-pi-codeczero.html
> >
> > this board is for the pi zero, but obviously works nicely with a Pi3 I
> > don't have a Pi Zero yet, but will so soon, then I can test how this
> > performs.
> >
> > great news is that there is an audio board with stereo mic-in /w PIP,
> > working with a Pi3, Pi4 and hopefully Pi Zero.
> >
> > Setup on the actual Pi3 is simple, the board is recognized by the
> > kernel (Raspbian GNU/Linux 10, Linux raspi3 4.19.97-v7+) without any
> > driver install needed.
> >
> > the card is visible by the alsa:
> > pi@raspi3:~ $ arecord -l
> > **** List of CAPTURE Hardware Devices ****
> > card 0: IQaudIOCODEC [IQaudIOCODEC], device 0: IQaudIO CODEC HiFi v1.2 da7213-hifi-0 [IQaudIO CODEC HiFi v1.2 da7213-hifi-0]
> > Subdevices: 0/1
> > Subdevice #0: subdevice #0
> >
> > So in a darkice config you can use it like:
> > ...
> > device          = hw:IQaudIOCODEC
> > sampleRate      = 44100
> > bitsPerSample  = 16
> > channel        = 2
> > ...
> >
> > as soon as I have a pi zero I'll try the board and will report.
> > bests, Udo
> >
> > Thanks in advance
> >
> > Garth
> >
> > ps. The stream seems quite low gain here in the USA
> >
> > On Apr 21, 2020, at 08:56, udo noll <un@aporee.org> wrote:
> >
> > hi Grant & all locustreamers,
> >
> > maybe I missed that info, but the IOAudio website says about the
> > pi-codecZero board (for the raspberry pi zero) that it is mono and
> > doesn't work with a pi3 etc., and didn't he mention that it doesn't have
> > PIP / bias voltage available?
> >
> > anyway, it obviously works great with a stereo pair of Primo EM172.
> > that means this board together with pi zero would be perfectly small,
> > stereo and has low energy consumption. I'give it a try with a pi zero
> > soon.
> >
> > I'm just listening now, it's quite low noise, better sounding than the
> > cirrus board. quite cool. check our my backyard within the next hour:
> > http://radio.aporee.org:8000/live.m3u
> >
> > bests, Udo
> >
> > --
> > radio aporee 52° 29' 66" N, 13° 25' 26" E
> > ::: maps https://aporee.org/maps/
> > ::: stream http://radio.aporee.org
> > ::: field radio https://aporee.org/fieldradio
> > ::: miniatures for mobiles https://aporee.org/mfm/
> >
> > _______________________________________________
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