There are these:

https://www.tindie.com/products/onehors ... rod_search

They are made with ESP32-DOWDQ6 012017 PC3W29 ICs, not sure if this is rev 1 or not though.

Do you have pullups on the I2C bus?

It is for dummy users like me!

Just FYI, I am having a production run of ICS43434 microphones made and these will be available on Tindie in a few weeks. In the meantime I have a supply of about a dozen hand-assembled ones.

Is there some way to make use of the ICS43434 and this I2S audio coding in the Arduino IDE?

@Martin Excellent, thank you!

I tried it but it didn't compile for me, probably because I am using an old Ardino core.I'll update and try again.

Now can we use some similar simple incantation to enable light sleep?

Is there an example using deep sleep with the Arduino IDE?

And I have an external 32.768 kHz LSE on my ESP32 dev board. How is this used in the RTC domain?

Any idea when we might be able to use SPIFFS with the Arduino IDE?

Here's a bunch of sketches for the Arduino IDE (C++) that use I2C to read sensors. Not the LSM9DS1 but this should be trivial since all of these sketches are trivially adapted from sketches written for the Teensy or STM32L4 Arduino cores, and the LSM9DS1 works for these. https://github.com/kriswiner...

We use this with the ESP8285:

https://github.com/gtomasch/ESP82XX_WiFi_UART_Bridge

and this dev board:

https://www.tindie.com/products/onehors ... ent-board/

Then there is this development board:

https://www.tindie.com/products/onehors ... ent-board/

runningd this github repository of Arduino sketches:

https://github.com/kriswiner/ESP32

If small, battery-powered, and portable is what you are after.