3 = Arduino IDE (actually VSCode / PlatformIO)
4 = M5EZ

Hello @wadoadi

I am glad to hear you got it working. And thanks for reporting back.

Happy Stacking!
Felix

Hello @Zontex

fair enough.

Thanks
Felix

Hi guys

I personally am not a big fan of the multi function button (up, mid, down) used in the M5CoreInk. I think what I miss is the click which normally tells me I've pushed a button enough.

Anyways, I was wondering about what you guys think?

Thanks
Felix

Hello @wadoadi

just curious, where did you get those pin numbers from?

#define SDA 25
#define SCL 13

The Groove port (red) on M5Core2 uses GPIO32 / 33 for SDA and SCL.

Thanks
Felix

Hello @ckuehnel

Without opening M5CoreInk you probably cannot measure battery voltage with a multimeter. However you can use GPIO35 to read the battery voltage. Check out float getBatVoltage() here.

BTW: I've opened my M5CoreInk today and added some photos to my page (link below). Measuring power consumption in light sleep, deep sleep and shutdown will be next.

Cheers
Felix

Hello @ckuehnel

great, I am glad you've figured it out. I am looking forward to hearing what you find regarding internal battery voltage over time.

Cheers
Felix

Hello @ckuehnel

I am running this example from master branch successfully on my CoreInk. Care to share your code?

Thanks
Felix

Hello @Martin8bity

from what I can tell you can't, at least not directly. You can read the battery voltage (GPIO35) so you could poll it a couple of times and if the battery voltage goes up or is steady over time, USB-C power is most likely present. If the battery voltage goes down over time M5CoreInk most likely running from battery.

In M5CoreInk USB-C power goes through TP4057 (charger) into the battery, from the battery the power goes though a MOSFET (on/off switch) into SY7088 (boost to 5 volts) and then into SY8089 (regulator 3.3 volts) into ESP32 etc.. All three ICs are preconfigured and not on I2C or something, meaning they cannot be queried about their state. For instance to know whether USB-C power is present the LED (red) of TP4057 would need to be queried, but I don't think it is hooked up to a GPIO.

But then again, I only had my M5CoreInk for a couple for hours so I might very well be missing something.

Cheers
Felix

Hi guys

UIFlow firmware 1.6.6.1 for M5CoreInk is out - works fine for me.

Cheers
Felix