MIC+ with Balena - No capture card found [solved]

Installation guides MIC+
#1

I am trying to record voice and play back on RPI 4 with MIC+ running on BalenaOS. I have installed als-utils and have .asoundrc file as below

pcm.!default {
  type asym
   playback.pcm {
     type plug
     slave.pcm "hw:0,0"
   }
   capture.pcm {
     type plug
     slave.pcm "hw:1,0"
   }
}

speaker-test works fine but record does not work. “aplay -l” shows the card but “arecord -l” does not show any card.

Screen Shot 2020-12-17 at 10.53.06 PM
Screen Shot 2020-12-17 at 10.53.06 PM2122×418 24 KB

But when I plug in a USB MIC, it shows up. I am wondering what’s wrong.

I also have below configuration as suggested

BALENA_HOST_CONFIG_dtoverlay = hifiberry-dac

DT Params = “i2c_arm=on”,“spi=on”,“audio=off”

Any help is much appreciated.

Thanks,
Mithun

#2

I figured it out. I had to use “googlevoicehat-soundcard” as overlay

Screen Shot 2020-12-18 at 10.30.53 PM
Screen Shot 2020-12-18 at 10.30.53 PM2592×314 30.2 KB

And .asoundrc as below

pcm.softvol {
  type softvol
  slave.pcm dmix 
  control{
    name Master
    card 0
  }
}

pcm.micboost{
  type softvol
  slave.pcm dsnoop
    control {
      name Micro
      card 0
    }
  min_dB -10.0
  max_dB 50.0
  resolution 256
}

pcm.!default { 
  type asym
  playback.pcm "plug:softvol"
  capture.pcm "plug:micboost"
}

ctl.!default {
  type hw
  card 0
}
#3

Perfect thanks for sharing!
Sorry for not answering quicker

#4

No problem @Raspiaudio … if anyone wants to get a code reference , I have one project on hackster.io with github repo here.

#5

this is a great project! thanks for sharing I really like the telegram notification system and how you have trained the model with pictures of your smartphone shot from the raspicam, clever!

A fun evolution to the project could be to play a bird song from the web corresponding to the identified bird breed.

I will publish your link of the project page