@felmue

Dutch reseller TinyTronics (http://tinytronics.nl) was so kind to replace the M5Core for free without any discussion and even without shipment costs!

Thanks for your comments! I use two identical M5 Core (light) gray and installed the chess program on both devices via M5Burner. But it also goes wrong with other programs, not only with the chess program (photo).

It doesn't matter if I flash with M5Burner or upload (a simple sketch) via Arduino IDE while M5Stack.h was included, the display remains off but the program is running because there is sound coming from the speaker.

As suggested I ran the display demo program but unfortunately that didn't help either.

The display of my two month old M5 Core with FW 1.7.0 remains black. When I upload the chess sample I can hear the beeps and there is the expected output through the serial monitor. But never output to the screen, no matter which other sketch I use.

The software and driver used on the PC seemed okay, as everything works fine with a different M5 Core.

Is my M5 Core faulty or does someone have a solution to this problem?

Solved! With M5Burner I had downloaded the factory test .bin file and could upload it to the M5Paper. Unfortunately with a blank screen.

It turned out that the downloaded .bin file on the hard disk was only 352 kb, much too small of course. I downloaded it again and the size was 2,137 kb by then. Then I flashed that file and everything now works as it should.

Things would have been a little easier if M5Burner showed an error when a .bin file is corrupt or incomplete.

Just installed M5 burner and I did not realize I could use this. Thanks! The calculator demo works perfect but I doubt if the Factory Test program is the one which was factory installed. I can upload it from M5Burner but it did no replace the previous installed sketch. Besides uploading is very fast so I suppose the filesize is too low to be the sketch I intend to upload.

Thanks for helping,Martin! It seems to me that the issues with blank screen after upload are over after I reinstalled the board in the board manager, maybe I did something wrong or the computer, presumably me ;-)

Do you mean by VSCode PlatformIO? Then we talk about the same, the software from M5 is indeed intended for that. But, sorry to say, I hate PlatformIO so I hope for another upload from the M5 folks, software that is easy to upload with the Arduino IDE.

Recently I got the new M5Paper and I run into several problems. Via the standard Arduino IDE I can upload the example programs SHT30 and BUTTON, both of which work.

I can compile the example HelloWorld without errors, but after the upload I only see a blank screen. Same problem with M5EPD_TTF and TOUCH.

How is that possible? Am I doing something wrong or did I buy something that is not yet properly developed and is everything still premature?

Furthermore, I would like to restore the test as installed at the time of delivery. On GitHub I see the files under M5Paper_FactoryTest, is this the right software? It seems intended for PlatformIO but as many others I don't use that and hope you can tell me how to restore the factory demo from Arduino IDE.

Help is appreciated!

I intend to use the M5Stack with my I2C AS3935 Lightning Sensor from DFRobot (https://wiki.dfrobot.com/Gravity%3A Lightning Sensor SKU%3A SEN0290). Although this sensor works fine with an Arduino Uno I did not get it working with the MStack.

The DFRobot AS3935 library is not intended to use with ESP32 and other libraries generate many - different - errors. So my question is if any of you got an AS3935 sensor working with the M5Stack or can help me to get it working.