I have both a M5Stack Core2 and Lora868 moduel infront of me right now.
The core module has been disassembled in 2 parts (3 considering the sensor module by removing the 4 screws. To do so I also disconnected the 2 whire battery connection between the battery, sticked to the grey backplane module and the main board. Now the Lora blue module can be connected to the main core board (the white one). It fit perfectly. Now it is the turn of the back plain but I can see at least two problems here:

there's no way to connect the battery back to the mainboard now that the lora module is in between. Maybe I can drill the lora board PCD and sacrifice a couple of empty pcb vias there or add an additional couple of wire segments to go through them. the battery or the grey plastic frame on the back plain mechanically hit the Lora module metal shield. This second one seems more difficult to fix.

The result is that the backplane cannot be reconnected to the sandwich if the Lora module is in between.

Any idea? Are a couple of photos useful here?

@leo05 said in External WiFi Antenna?:

@lukasmaximus

Same here - We are using Fire or Core2 + Arduino. In dense environments (a lot of WiFi AP) device simply cannot connect or disconnects after a minute or two. Our options: 1. Add antenna somehow (with some soldering or whatsoever) 2.Add the additional WiFi module with antenna 3. Use other device.
Any thoughts?

Hello,
Does your computer can detect the serial port of the camera when you connect it by USB?

No because the module uses the GRBL Gcode interpreter as the firmware.

@world101 The drivers are hard soldered and cannot be replaced without unsoldering.
I though the "Hard Limit" was only available to drivers with current sense which the DRV8825 doesn't have.

@meirmark is there already a real solution? The simple example of Webserver for W5500 as provided by M5Stack gives me the same compilation error using the latest Arduino IDE. Please people from M5Stack : please respond with a working webserver example program. Many thanks.

Hello @Satzende

Did you have a look at the SIM800 SMS example? I know it's not for the SIM7600 nor for the M5Core2, but the AT commands should be the same / similar I guess.

Thanks
Felix

@sinzapatillas
I don't know, I am not an expert in Lora. But you talk about a distance of (300m - 2km max) and the article, without external modification, is 20m if I remember correctly.

Regards
Carles

Hello @paul-k

how far did you get? Is the M5Core2 talking to the LoRa module?

Keep in mind that the LoRa module was designed for M5Stack (Fire, Gray, etc.) and some GPIOs have changed from M5Stack to M5Core2. You can find a comparison here.

I don't have the LoRa module, but from looking at the schematic this should be the GPIO mapping:

LoRa      <-> M5Core2 <-> Name

GPIO18  <-> GPIO18   <-> SCK
GPIO23  <-> GPIO23   <-> MOSI
GPIO19  <-> GPIO38   <-> MISO
GPIO5    <-> GPIO33   <-> CS
GPIO26  <-> GPIO26   <-> RST
GPIO36  <-> GPIO36   <-> DIO0 / INT

Note: on M5Core2 by default GPIO33 is used as external I2C (SCL) on the Groove port A. Luckily external I2C is not enabled by default so that should not interfere. Just keep in mind that you cannot use the LoRa module and external I2C.

Thanks
Felix

Hi, thanks for reply.
@ajb2k3 :
Every thing you wrote is ok ! And I would suggest to do it - in an open-source project.
But here we have an comercial project. I payed for something which they show not correct in the advertisement.
I cannot use it and I get so support !!

I cannot use this system ! I'll go back to Arduino.

BTW: M5Stack cannot be used to control the rover. The rover-system works only correct if I can control all the 6 motor individualy. So -- no change with M5Stack

regards
K.D.

@powersoft said in M5Paper I2C:

Today I rewrote the routines for the BMP280 and BME280 for a single device.
Simple include the source into the main program, and call it.
This is now working as I wont. It takes a afternoon of work!
Now put the finishing touches on the BMP280/BME280.

Would it make sense to post them on the forum when they are ready?

Cheers
Jan

Hi @Powersoft sorry for the absence, ive had some issues to deal with.
nice work finding the issue.
Create a project in the project forum and post your code and solution in there.

You could loop over x and y, calling readPixel to get individual values, and save them.
Or you could dump the raw buffer, which is available using frameBuffer, and is of size getBufferSize.

@felmue That actually worked. Not an ideal situation as I cannot use the newer units, but for now the Lego motors turn again which is awesome!
Thanks a lot! I downgraded the UI, but it never occured to me that I should downgrade the firmware too.