+1

I am able to use these mics with the nRF52 and STM32L4 and Teensy (various) but am not sure if there is an easy way to do so with the ESP32 Arduino core.

I am looking at the data sheet of the ESP32 D2WD 5 mm x 5 mm package with internal 16 Mbit flash and it says: "ESP32-D2WD has a 16-Mbit, 40-MHz embedded flash, connected via pins GPIO16, GPIO17, SD_CMD, SD_CLK, SD_DATA_0 and SD_DATA_1." 1) I assume we cannot connect anything to GPIO16, GPIO17, SD_CM...

There are some dev boards for sale here:

https://www.tindie.com/stores/onehorse/

NCP161AMX330 is an ultra-low-noise 3V3 LDO. I use the one that comes in the DFN-4 package which is 1 mm x 1 mm and requires 2 0402 caps, Iq is 18 uA, current load minimum is 450 mA, perfect for the ESP32.

Just looked over the hardware manual again and noticed the comment that only the 40 MHz crystal is supported for wifi/BLE. I had 100 ESP32 dev boards produced that used the 26 MHz crystal (same as ESP8285) since at the time of the design (a year ago or so), this was what was included in the hardware...

Too bad, it is enormously entertaining!

I designed an ESP32 development board https://www.tindie.com/products/onehors ... ent-board/ that is open source. You could start with the EAGLE design files if it is close to what you have in mind or we could discuss a custom solution. E-mail me at tleracorp@gmail.com.

"I wane know how to replay I2S data from a microphone (SPH0645) on PC as a WAV file."

You can use Audacity as described here: https://www.tindie.com/products/onehors ... icrophone/.

There's always this here:

https://github.com/kriswiner/ESP32/tree/master/Bosch

Any plans to extend this to the Arduino core? My boards also have a 32.768 kHz crystal and I would like to be able to make us of it in my Arduino sketches.