updated with Codec Zero

README.md

@@ -12,7 +12,7 @@ Hardware
 - Buttons connected to the Raspberry pi GPIO as shown in the schema to debounce noisy contacts  
 ![dog-trainer-schema](assets/dog-trainer-schema.png)
 
-- USB speaker with a microphone e.g. [Jabra Speak 410](https://www.jabra.com/_/media/Jabra_VXi_Product-Documentation/Jabra-SPEAK-410-Series/technical-specifications/RevB/Jabra-Speak-410-Techsheet-A4-290420-Web.pdf)
+- USB speaker with a microphone e.g. [Jabra Speak 410](https://www.jabra.com/_/media/Jabra_VXi_Product-Documentation/Jabra-SPEAK-410-Series/technical-specifications/RevB/Jabra-Speak-410-Techsheet-A4-290420-Web.pdf) or [Codec Zero](https://www.raspberrypi.com/products/codec-zero/)
 
 - microSD card 8GB
 
@@ -56,9 +56,10 @@ First try using default audio device for playback and recording. Edit `dog-train
 > `nano dog-trainer.py`
 
 Skip to the next section `Run it!`. If either playback or recording does not work check your sound cards
-> `aplay -L | grep ^hw:CARD=`
+> `aplay -L | grep ^hw:CARD=`  
+`arecord -L | grep ^hw:CARD=`
 
-If your sound device is other then `USB` then change the line `card USB` in ALSA config
+Put your sound device name `card USB` or `card Zero` into ALSA config file
 > `nano .asoundrc`
 
 Install the ALSA config file
@@ -100,4 +101,7 @@ Set volume for playback and recording
 Launch soundcard mixer
 > `alsamixer`
 
-Press F6 to select a soundcard. Find your USB sound device in the list e.g. `Jabra Speak 410 USB`. Press F4 and use up/down arrow keys to set recording volume and repeat also for the playback (F3). Make sure it is not muted. Press (m) to toggle mute. Press ESC to exit.
+Press F6 to select a soundcard. Find your USB sound device in the list e.g. `Jabra Speak 410 USB`. Press F4 and use up/down arrow keys to set recording volume and repeat also for the playback (F3). Make sure it is not muted. Press (m) to toggle mute. Press ESC to exit.
+
+Make it survive after the restart
+> `sudo alsactl store`