No sound transmitted

[arduino-man]

Hi, great project! Installed it today on a raspberry pi 2 and connected a Logitech c920 webcam/microphone to it. I am able to record using the webcam microphone with "arecord" however barnard will not transmit any sound. F1 does set me in tx mode but there is no sound transmitted. I have ensured that my microphone is the default capture device. Any suggestion will be greatly appreciated.

P.S- I am working on implementing the "always on" capability and will submit a pull request soon ;)

[FanchenBao]

On RPi 3B+, you need to set up ~/.asoundrc to make the mic work. Suppose we have the speaker working on sound card 0 (i.e. built-in sound card. I use a headphone to get the sound via 3.5 mm jack) and mic on sound card 1 (a USB mic), the following .asoundrc file works for my barnard, both for receiving and sending sound:

pcm.!default {
    type asym
    playback.pcm {
        type plug
        slave.pcm "output"
    }
    capture.pcm {
        type plug
        slave.pcm "input"
    }
}

pcm.output {
    type hw
    card 0
}

ctl.!default {
    type hw
    card 0
}

pcm.input {
    type hw
    card 1
}

That said, if I plug in my USB speaker, which uses sound card 2, and changes pcm.output to card 2, sound does comes out via USB speaker, but with very poor quality. I don't know why that is the case, so for my use case, I simply stick with the built-in sound card and 3.5 mm AUX for output.