Thanks for the reply. I've tried moving right above the microphone and speaking loudly but still the recorded file is just silent. Could the issue be the settings in amixer/alsamixer? There are many options, it's not clear to me which ones necessarily relate to the microphone:

[root@luckfox root ...

Hello all,

I'm experimenting with the Luckfox Ultra W and experimenting with the audio. The speaker works fine, but I cannot get any sound from the microphone. I've been using arecord to do the recording as suggested in the wiki:

arecord -f S16_LE -c 2 -r 16000 -D hw:0 -d 30 test.wav

There are ...