Hi guys

Power consumption update: even though the example keeps the M5CoreInk in shutdown mode (everything off except for the RTC) most of the time and only powers up for about 2 seconds every minute to do the update, the built in battery only last for about one week.

Thanks
Felix

I saved a copy of the IP5306_I2C data sheet from a long time ago. In this table, I see the charge current can be set by the CHG_DIG_CTL0 register (see the formula). I would assume the M5stack designers took care of setting the max charge current with that register bits 0 through 4, though I could be wrong.

0_1610043247081_Screen Shot 2021-01-06 at 12.36.51 PM.png

If you want the entire data sheet, let me know.

@m5stack Thanks to take it into consideration.
I received my Core2 today. Trying to plug the PLC circuit after removing the bottom seems difficult. On the left side there is a metallic thing (motor?) that push the circuit, and pin headers are really short.

About headers, you sell SMT mount connector in your shop but I think they are 2.5mm long (like the old modules one's)? right? on the micro-module they are 3.5mm (total height 5.84).
For makers like me, if we want to build modules prototype, where can we find compatible trough hole or SMT connectors? I search and found nothing? any ref?

Thank you for your reply. Yes, I did stumble upon the bin2code.py script you mention. The issue is that it doesn't convert the image to raw pixel data (usable by M5EPD_Driver::WriteFullGram4bpp).

After a bit more research, I found a preliminary command using ImageMagik to convert an image to raw pixel data for the M5EPD: convert input.png -depth 4 -negate output.gray

Then convert the raw data to C with bin2code.py : ./bin2code.py output.gray

The result can then be appended to ImageResource.h

@Powersoft
Hello, after contacting M5Stack support the problem is probably the flash chip, M5Stack is replacing my M5Paper.
I had performed this upload test at slow speed but without improvement. Thanks for your help

@powersoft

Found the bin file, under the M5 Burnet

@sodoku Thanks. I just got an email that the M5's are back in stock... Digikey still showing backordered though. Guess i'll have to order from M5 directly.

Thanks for the info

@loboris will push the request forward :)

Hello, could you try to install FTDI drivers as well to see if it can solve the issue for you?

Hello @sodoku

that is actually not a bad idea. I'll keep that in mind. Thank you for suggesting it.

Cheers
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

UIFlow firmware 1.6.6.1 Seems to fix this issue, please take a look and let me know if you guys have any more concerns :)

I stumbled on this restriction again, and dug a bit deeper in the issue.
It appears that the hardware is not limiting the baudrate, but the M5Stack library. More specifically, M5.begin();
Luckily, you can skip the UART init, and do it yourself like this:

M5.begin(true,true,false);
Serial.begin(2000000);
Serial.flush();

And now it works for 2000000 baud.

Hello @AndyT

hmm, strange, if anything I'd expected the M5Stack Gray to work with low brightness level and the M5Stack Black to not behave due to the fact that the M5Stack Gray has additional hardware (e.g. IMU) consuming power to keep the device powered on.

That said, I suspect the IP5306 switching off due to too light load. Try to add the following statement before going into deep sleep. It should prevent the IP5306 from shutting down under light load.

Happy Stacking!
Felix

@m5stack Understood. Thanks

@sparkinman

Check that:

You have added the M5Core2 library and are doing #include <M5Core2.h> and not using M5Stack.h. Until they merge it my Pull Request and release a new version, my version is more like it will be, better documented and has graphical buttons. (Simply clone it or get the zip file and unpack so that M5Core2 is a subdir of your Arduino libraries dir.)

In Arduino Preferences, you have added https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/package_m5stack_index.json as an "Additional Board Manager URL"

Make sure you then select M5Stack-core2 from the "Tools / Board / M5Stack-Arduino" menu.

If this is all good, then you should be able to run one of the examples from the "File / Examples / M5Core2" menu.