PI 4 Raspbian Buster Mic doesn't work


I’m trying to setup a PI 4 with the Matrix Creator, so far so good I’m able to play with the led successfully but now I’m trying to get the mic array working, but it doesn’t work :frowning:
I’ve followed this doc https://matrix-io.github.io/matrix-documentation/matrix-creator/resources/microphone/

But the arecord command doesn’t work

arecord recording.wav -f S16_LE -r 16000 -d 5
arecord: main:828: audio open error: Device or resource busy

Anyone have an idea ?

Hi @jaumard,

That prompt usually occurs when the microphones are being used by some other application. Do you have any voice assistants or anything else audio-related running in the background?


Look like you were right Samreen ! For some reason “rec” was running in background :slight_smile:

Thanks !

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