Record and playback without Mic on ES8388

[gerthalberg]

Does anyone know the configuration for recording and playback from the line-in jack - without having the microphones active also. That is short of desoldering the microphones?

[afaber999]

Hi I got the same question, when I select channel 1 I get MIC1 and MIC2 and Line1 mixed, when selecting channel 0, I get MIC3/MIC4 (which are not populated on my board, but hear that input is active when I touch the PCB pads with my fingers)

[gerthalberg]

Good info, then maybe I can solder a new line in jack to those pads

[xuhongv]

did you solve it ?

[gerthalberg]

No - Haven't had the time yet.

[xuhongv]

we update the readme document.

[pschatzmann]

I have the same issue and don't find any update!
If I select AUDIO_HAL_ADC_INPUT_LINE2, I also get both the microphone and line in. With AUDIO_HAL_ADC_INPUT_LINE1 I don't get any input at all. I was double checking Register 10 - but it is set up correctly.

https://www.pschatzmann.ch/home/2021/12/15/the-ai-thinker-audiokit-audio-input-bug/

[GillesLACAUD]

Same issue for me :-( . I have route the ADC line2 in the register ADC CONTROL2 and on some board this seem to work fine...but with new board now a have also the MIC in the audio input . It is a ESP32-A1S 2974.
@xuhongv please could you send a link to this readme document and tell us if we can have only the line input and how to set this.

[TakesTheBiscuit]

+1

[johermohit]

did anyone solved it yet?

[GillesLACAUD]

Yes i have solved this....i have bypass the mic, just sold the 2 pins of the mics.
It is an hardware issue on the board, you can't have only the line in .

[massa007]

Would be great if anyone could pls upload an example code for recording and saving to SD! Fighting with this board for a while already...

[KlausMu]

Some time ago, this worked for me:
https://randomnerdtutorials.com/esp32-microsd-card-arduino/

Instead of
if(!SD.begin(5)){
you need
#define CS 13
#define MOSI 15
#define MISO 2
#define SCK 14
SPIClass spi = SPIClass(HSPI);
spi.begin(SCK, MISO, MOSI, CS);
if(!SD.begin(CS, spi, 4000000)){

[massa007]

Thanks a lot! I got the SD part working but I’m mainly struggling with utilizing the microphones.. I can play stuff from SD but how do I use the mics?

[KlausMu]

Never tried it, but here you can find an example for using microphones:
https://github.com/pschatzmann/arduino-audiokit

[massa007]

That’s my missing part!! Awesome :)
Thanks a lot!!

[pschatzmann]

The AudioKit is just a HAL for the Audio Tools Library. You will find there much more and examples....

[Jerzeek]

There is a great discussion about this problem on @pschatzmann's website: https://www.pschatzmann.ch/home/2021/12/15/the-ai-thinker-audiokit-audio-input-bug/ here someone suggested moving 2 capacitors, I tried this and it worked perfectly!
Thank you Phil!

[schrab]

In my case after moving caps there's still signal from line in, so I've also removed two caps marked with blue. Now I have separate stereo line-in and microphones.
Also Line-in jack have swapped L/R channels