Hello @Skink

thank you for the clarification. I appreciate it.

Thanks
Felix

Hello @flatline69

Sorry to hear about your troubles.

Please note: I only have an M5StickC but no 18650C HAT so I cannot fully recreate your setup. I also have not been able to find a schematic for the 18650C HAT so I am guessing about how it is connected with the M5StickC.

One thing that is not clear to me is whether the 18650C HAT can charge its battery on its own, e.g. w/o M5StickC installed. Does it have its own charging IC?

Also you mentioned Error 22. Did you ever get over that? I mean does your M5StickC run from its internal battery w/o being installed into the 18650C HAT?

Have you tried to reinstall the factory test firmware the M5StickC came with? It might be worth doing that and check if the heat issue with the 18650C HAT still occurs.

Also do you happen to have a USB voltage/current meter? If yes, it might be worth measuring the charging current. For the M5StickC it is normally set to about 100mA in function Axp.begin() since its internal battery only is about 90mAh. But if that function is not called (for whatever reason) the Axp IC defaults to 780mA.

And last question: Did you measure the voltage of your 18650 battery? Does it already have some charge?

Since I am mostly guessing here and my assumptions could be completely wrong it might simply be that either your M5StickC and/or your 18650C HAT is/are defective.

Good luck!
Felix

Hi @bigjohn2345

this error message seems to be part of the factory test. I am afraid the battery in your M5StackC got depleted so much that the voltage reading is below 3 volts and therefore the battery is considered 'dead'.

I suggest you contact the shop and ask for a replacement.

Felix

From FactoryTest.ino

    float VBat = M5.Axp.GetBatVoltage();
    if ((VBat < 3.0) || (VBat > 4.4))
    {
        ErrorMeg(0x22, "Bat Vol error ");
        return false;
    }

Hi @Kris

that is entirely up to you - pin0-4 are just variables.

In UIFlow use the first statement to initialise the desired GPIO (0-36) to be used with one of the 5 variables (pin0-4).

MicroPython example: variable pin0 is used for GPIO18:

pin0 = machine.Pin(18, mode=machine.Pin.IN, pull=machine.Pin.PULL_UP)

Cheers
Felix

Hello Rop

nice, now we already have two keyboard layouts (anybody working on Dvorak?).

I like your solution for uppercase letters and the caret handling is nifty - well done.

Cheers
Fexli

Hi @michaelblight

yes, that is to be expected. The M5GO CHG Base has it's own charger IC which is used in this case.

Thanks
Felix

Hello @michaelblight

sorry to hear. There is a fuse (labelled T200) in the M5Core Fire which might be the only thing that blew.

Thanks
Felix

Hi Van

thank you for the test application. I've added my test (using a finger) in the issues section. I think I have a stylus somewhere and when I find it I'll give it another go.

Cheers
Felix

Hello Jack

you are welcome and thank you.

You'll need to check the MPU6886 datasheet

There is a sleep mode bit (Bit 6) in register 107 (power management 1). When I read that register I get 0x01 which seems to be the default. To put MPU6886 into sleep mode I'd write 0x41 into that register like that:

import i2c_bus
i2c0 = i2c_bus.easyI2C(i2c_bus.PORTA, 0x68, freq=400000)
i2c0.write_u8(107, 0x41)

Thanks
Felix

Hello @koreanEggCoffee

yes, that is possible - I am powering my M5Atom this way.

However please note: There is no protection against wrong polarity so please be careful not to accidentally swapping 5 volts and GND.

I also suggest you disconnect the external 5 volts before connecting USB-C. Or in other words only connect one power source at the same time.

Please also refer to the M5Atom schematics which outlines the 5 volts connections between USB, 5v pin, Groove, LEDs and 3.3 volts regulator.

https://docs.m5stack.com/#/en/core/atom_matrix

Cheers
Felix