Supply power via the MBus on the under side of the core2

Unfortunately as of today, my Battery isn't working again. I can update and run will using USB power but unplugging kills the M5Core.

Well, I used VSCODE with the PlatformIO extension But on my core 2 v1.1 there was no image. I will add photos here soon

I pulled the battery and pressed the Reset button whilst reconnecting to USB. This got the device to boot and be detected correctly. I couldn't erase the bad flash, but I flashed the stock firmware back using M5 Burner , this worked.

Sorry, but I will close the topic by giving the answer myself :-). I was realy lost but tried the following (based on some other reading) I changed the cable and took the short usb cable that I found in the box. I plugged, made myself ready with the erase process I pressed the on, pressed the reset and released, release the on The com6 was again an option on the m5 burner. I started by erasing, the clic clic was still present. I burned a new firmware, the machine is working again. I hope it will help similar cases :-)

Hi felmue, Thank you for your comment. I have done with M5.Axp.SetVibration command. Thank you!

I'd recommend using batteries with a lower capacity. The M5 Core2 is designed to support batteries with a capacity of around 3000-4000mA, so sticking within that range should help prevent overheating issues. Additionally, if you're looking for alternative battery options, you might consider lifepo4 cylindrical cells. These are known for their stability and safety, making them a popular choice for various devices.

I am surprised that Grove level shifters are not part of the M5Stack hardware offering. Just today I went onto JLCPCB and designed myself a PCB that can fit in shrink tube and has a Grove socket on each side, the board has a level shifter that converts a Grove (5V power + 3.3V logic) to pure 5V power + 5V logic. (it's a level shifter board that generates its own 3.3V reference with an LDO). I made an order of 90 boards at a shipped cost of $135, so a little over a buck a board. I am just surprised nobody seems to sell this, least of all M5Stack with a core offering of 5V power + 3.3V logic on just about everything. By the same process I could quickly make a set of boards that takes 5V power 3.3V logic from one side, and gives 3.3V power 3.3V logic on the other (just by duplicating the design, rearranging the components and deleting the level shifter). I'll probably do it the day I need it. Or maybe sooner.

Hello @HappyUser I think you are mistaken. AFAIK the M5Atom Lite / Matrix doesn't contain an AXP. BTW: With M5Atom Lite / Matrix you will never get a really low power consumption as even when ESP32 is sleeping there still is the USB/Serial chip which cannot be turned off I think. For the M5AtomS3 you can find a deep sleep example here. Thanks Felix

As long as there is an active power supply it should auto power on. As to fonts, there is a memory issue with the core2 which meant that in uiflow1 and micropython a lot of fonts had to be removed as they took up needed space required to support units. UIFlow2 makes an attempt to fix this issue but isn't fully working yet.

The issue persists with firmware 1.12.8

The information is about somewhere but on the ESP32 ports for M5Stack, Images must be smaller then a certain file size and the save format must be of a certain format. I you search Github for my UIFlow Handbook, you will find this data in the PDF.

https://randomnerdtutorials.com/esp-now-two-way-communication-esp32/ I run a small collection of M5Stack components communicating in ESP_NOW. A Core reading a Stamp for remote temp, the Stamp receives commands to operate a servo motor from the Core. The M5Stack JoyC controlling a BugC unit is a good example as well, in the M5Stack examples GutHub. Or my own GitHub repository: https://github.com/teastainGit/ESP_NOWpeer2peer/blob/main/ESPpeer2peer/ESPpeer2peer.ino has an example of one sketch that can be copied over to another device, change the MAC address and it works with each unit talking both ways with each other!

That's perfect Lewis, it worked! I repeated the same steps as you described and had the same results (it works with 16MB and stops working with 4MB configuration). So, although the root cause and definitive solution are unclear, at least we can keep using our Core2 this way. Many thanks for sharing a solution. Wish you all the best.

I decided me for M5 Stack, because I like the different sensors and Cores also look good. An a shop nearby sells that stuff. Everything else is fine! I ordered another Distsensor to see what happens I just finished my project. But everything depends on a correct distance. I will see. Thanks so far

You may disregard this post. I changed for another USB cable and was able to recover COM3