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By eriksl
#84903 Yes, best way is to use an external ADC which is connected to the ESP using I2S. I2C could do as well, I think, for this sample rate, but then you would have to use a very efficient I2C implementation, i.e. not the one that comes from Espressif.
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By eriksl
#93225 Yes, I2S can be made working, although you'll need some experimenation because the documentation is as good as non-existant. Having some sort of oscilloscope or protocol analyzer nearby will also help.

I am using I2S to generate wave forms for ledpixel devices, also known als ws2812 etc.