After taking a look at the specs of the specific board I have:

and at the specifications of the MPU9250 specifically:

I came to the conclusion that it must be the INT pin of the MPU9250 and that pin cannot be accessed through the pinout of the PCB. I would have to solder a wire directly to it. And then maybe I'd also have to use a resistor, capacitor or whatever..

That's actually very interesting. I was planning to use the wrist movement detection to turn on/off the screen. But putting the ESP into deep sleep instead sounds like a fantastic idea.

But still, I know that SYS_INT is supposed to be GPIO35 on the ESP, but which pin of my MPU9250 am I supposed to connect to GPIO35?

VIN, 3V3, GND, SCL, SDA, SDO/SAO, NCS or CSB?

I have an M5Stack with the watch bottom and I want to add an MPU9250 to it to detect wrist movement.
(I also have an M5StickC which comes with an MPU6886 built in, but it's lacking other features I need...)

To get maximum compatibility for existing libraries, I would like to wire my MPU9250 to my M5Stack the same way it's being done for the M5StickC with the MPU6886.

So I looked at the schematics:

I mean I can make a good guess about SYS_SCL, SYS_SDA, VESP_3V3 and GND.
But what is SYS_INT? According to the schematics it's GPIO35 on the ESP32, but which pin is it on the MPU?

My MPU9250 has the following pins: VIN, 3V3, GND, SCL, SDA, SDO/SAO, NCS, CSB:

So my guess so far is that i should connect it like this:

VIN -> not connected
3V3 -> 3V3
GND -> GND
SCL -> SCL (GPIO22)
SDA -> SDA (GPIO21)
SDO/SAO -> not connected
NCS -> not connected
CSB -> not connected

But according to the schematics I'm missing a pin (SYS_INT).

Any help is appreciated.

Thanks, but that's too big and I'm not sure if it's compatible with the watch kit.
I think I'm gonna try to get it to work with a MAX4466 or SPM1423. http://community.m5stack.com/topic/1864/adding-a-microphone-to-the-core-watch-kit/

I just bought an M5Stack Core and the Watch Kit.

Now I'm wondering what I have to do in order to be able to record audio with it. Could I use one of these boards?

Would that fit into the case? Could I use existing libraries and examples like this one for the M5StickC?

Or should I maybe use the same microphone that the M5StickC uses? According to this page it uses a microphone like this one.

Could I wire it up like this?

I think I just realized that the M5Stack doesn't have a built-in microphone.

Is there an example on how to record audio on the M5Stack using the internal microphone? I could only find a microphone example for the M5StickC: https://github.com/m5stack/M5StickC/blob/master/examples/Basics/Micophone/Micophone.ino

But I don't even know what it does as there are no comments in that file.

I've tried replacing #include <M5StickC.h> with #include <M5Stack.h> and flash it, but then it didn't do anyhting besides showing the text mic test on the display.

What's the point of resetting your password? Your new password will instantly be compromised again after every password reset until the sites allows/enforces https.

I guess M5Stack is a Chinese company. I hope they are aware that GDPR breaches are fined with up to €20 million or 4% of the companies global turnover (whichever is greater).