Cheap $7,- external usb sound card

I bought the following external usb sound card from Amazon for $7,- to integrate into my Video Doorbell project.

 

External USB sound card
External USB sound card

So why did I chose to go this route. Simple, I was looking at some audio pHATs  for the Raspberry PI and found that they will cost about $4,- a pop, then of course you also need a microphone, and bang you are at around $9,- to $10,-. So paying $7,- for a audio I/O ( 7.1 sound card ) is a smart choice. Another thing I saw which won me over was that the setup is quit simple.

Note: This link above will point to the same sound card for only $4,-.

In order to do the setup I connected a micro-USB male to USB female adapter to my PI zero and made two small changes.
Please note though that I do intend to remove the USB plug all together and solder things together in the final setup.

1: Find the US sound card number ( in my case the USB card is card # 1 )

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
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
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Set [C-Media USB Headphone Set], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0

2: create a file /etc/asound.conf with the following contents

pcm.!default {
        type hw
        card 1
}

ctl.!default {
        type hw
        card 1
}

3: and finally test the speaker :

  speaker-test -c2 -twav

This concluded the setup and testing. To use this external USB sound card in my project it had to fit tightly into the chassis which I built from scratch. So the USB plug had to come off and I had to solder some wires onto the card to connect t up to the Raspberry PI.

Video Doorbell assembly
external USB soundcard after removal of USB plug

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