Hello @foofera

hmm, the I2C communication working in setup() suggest the wiring is ok.

Are you using pull-up resistors on intSCL and intSDA?

Have you tried lowering the I2C bus speed?

Have you tried to put a delay between issuing I2C commands in your loop() code?

Have you tried to control a different I2C slave device from your STM32? Does that work in both setup() and loop()?

Thanks
Felix

Solved it, just had to scan this QR Code
https://community.m5stack.com/assets/uploads/files/1742537195503-bad5272e-aaac-47df-857b-c6d130524d36-image.png

IMG_8101.jpg

Yes - that is the resistor. Once I lifted the one leg (after removing the solder) the 120 OHM resistance was not measured across Can Hi and Can Low. I sure wish they had put in a jumper.

Hey Dennis, sounds like you’ve covered most of the basics. A few things to check: make sure the antenna switch (INT/EXT) is physically set correctly on the module. Also, the NEO-M8N can take a few minutes for a cold start—try leaving it powered outside for 15–20 minutes. Lastly, ensure it has a clean 3.3V power source; voltage drops can affect satellite acquisition. If none of that helps, try updating the GPS firmware via u-center. Two dead modules is unlikely, but not impossible. Good luck!

@kuriko
thank you.

Thank you everyone for all the messagges.

update>
I got it to work.
Spent many whours trying and playing with DIP, and was able to get it working bu using a FTL-UART board and connecting straight to U-blox, which was challenging since I dont have a windows pc and had to borrow one.

the main problem seems to be confusion with DIP, and cables.

thank you all for the help!!!!

I might "recover" this problem, althought I don't know why.
Only in japaness web page, you can find firmware of old version (But Its gone now....). When flesh back to old version , seems could solve this problem.here

There isn’t an official Eagle or DXF file publicly available for the ATOMIC Proto Kit layout. However, you might find community-made resources or footprints in forums or GitHub repositories related to ATOMIC boards. Alternatively, you could create your own PCB layout by measuring the board dimensions and pin headers manually.

@Kabron The benefit is that it can be used as an offline programmer. Love this idea in that I don't need to use a computer to program a few various HEX/BIN files to several different chips.

Once the partition.cvs table is converted for Arduino IDE, it made it simple to change the fat image for updates.

The project is set to be compiled with Expressif-IDF/IDE.
Modify the html / display code prior to fit your needs (Like updating to English to avoid confusion if you're trying to use the in program ability to upload files).

Same issue here, with the M5Stack Core 1. Just installed all the packages / libraries following the M5Stack instructions.

#include <M5Stack.h> void setup() { // put your setup code here, to run once: M5.begin(); M5.lcd.print("Hello World!"); } void loop() { // put your main code here, to run repeatedly: }

Output:

c:\Arduino\libraries\M5Stack\src\utility\pngle.c:31:10: fatal error: rom/miniz.h: No such file or directory 31 | #include <rom/miniz.h> | ^~~~~~~~~~~~~ compilation terminated. exit status 1 Compilation error: exit status 1

@twigs said in Using M5Stack for Custom Signage Displays – Need Advice:

Hey everyone, I’ve been exploring M5Stack modules for a custom signage controller project—curious if anyone here has experience using UIFlow or MicroPython for real-time display updates?"
"Also open to suggestions on the best units for LED or TFT screen integrations—appreciate any tips!

For a start, Micropython is not a realtime language, it is an interpreted language.

The biggest issue for signage is that of memory and ram, the bigger the sign, the more the memory is required.

screen capture M5core Webserial.png

@Anasilviaavalos had the same, M5burner bind with account and re-load firmware/ user application sorted it