[SOLVED] Matrix Voice and Raspberry Pi Zero Audio Input

Help and Troubleshooting
#1

Hello,
I followed the guide here https://www.hackster.io/matrix-labs/matrix-voice-and-matrix-creator-running-alexa-c-version-9b9d8d, for setting up Alexa on my pi using the recommended ready-flashed image (Stretch). With some fiddling (setting audio output to the headphone jack and changing a line in MediaPlayer.cpp to “alsasink”) I got the audio output to work.

However, it seems to me that Alexa can’t hear me. It won’t respond to the Wakeword, or give me an answer other than “I don’t know that” when I use keyboard input. I believe my mic array and audio are working fine, since I can record and play audio. I’ve tried to start fresh many times without much luck.

Below is the output of -play -l and arecord -l:

pi@matrix-alexa:/etc $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 6/7
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
pi@matrix-alexa:/etc $ arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM]
  Subdevices: 7/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 2: SOUND [MATRIXIO SOUND], device 0: matrixio.mic.0 snd-soc-dummy-dai-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

My .asoundrc in my home directory:

pcm.sc {
    type hw
    card 2
}
pcm.!default
{
  type asym
  playback.pcm {
    type hw
    card 0
    device 0
  }
  capture.pcm {
    type hw
    card 2
    device 0
  }
}

In the /etc directory, asound.conf.backup:

pcm.!default {
  type asym
  capture.pcm "mic"
  playback.pcm "speaker"
}

pcm.mic {
   type softvol
   slave {
     pcm "array"
   }
   control {
     name "MicArray Master"
        card 0
   }
}

pcm.speaker {
  type plug
  slave {
    pcm "hw:0,0"
  }
}

pcm.array {
  type plug
  slave {
    pcm "hw:2,0"
  }
}

Why can’t Alexa hear me? Is there a setting I am missing?

#2

Request to close this topic. I installed malos, ran it as default and now the wakeword works as well!

Credit goes to:

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