Hello @torntrousers

if you use GPIO 13, 14 in your code (as suggested) then in the COM.NB-IoT module you'll need to set dip switches for GPIO 16, 17 to on (the other four to off).

The GPIO numbering in modules are (so far) always matching the numbering in M5Stack (Base, Gray, Fire) devices but unfortunately M5Core2 uses some different GPIOs on the M5 bus.

This comparison I've put together a while ago might help.

Thanks
Felix

Hello @maxstack
I am not sure. Stamp Pico can be use after you use M5 burner to connect to M5 server. And after that, you can use it in UI Flow Website by connect the MacAddress.

@felmue Thank you.

@siva Old thread but yes, however I had to send commands to the bala2 manually as there is no module for it at the moment.

However I am seeing some odd problems with power, everything is fine when USB is connected but without it, eventually the combined grey+bala2 (or core2+bala2) gets in to a state where the power button cannot turn it on anymore until the controller is briefly removed and stacked on again. Once that is done it immediately can be turned on again. This doesn't seem to be a UIFlow issue though as ESP-IDF and Arduino sketches do the same thing.

Hello @macsbug

there should be no need to cut traces in the GPS module. For M5Core2 defining GPIO13 and GPIO14 in UiFlow (instead of GPIO16 and GPIO17) should do the trick. Or am I missing something?

Thanks
Felix

@sirtet thanks for the reminder, I forgot to add this to my UIFlow book!

They actually operate on the same register, this block is used to operate independent wheels, there may be some translatione problems ( use pulse less accurate ). The parameter range is -127 to +127. we will update it later, thank you feedback.

Hello @em

glad to hear. And thanks for reporting back.

Thanks
Felix

I received my Core2 and GRBL 13.2 module and it works due to @felmue 's hints:
https://community.m5stack.com/post/16551

The connector is JST SH 1.00mm

Thanks @felmue,
I have now got the card powered by following your observations :
connecting 5v to VIN, GND to GND, TX to RXD, RX to TXD
I don't need to trigger PWK to get the modem operational.
The modem don't connect to the network, but that's another problem..

In my railway project I use 12V in but only get 5V out max

0xff stops the motors.

Wire.write((speed >> 8)&0x80);

Needs to be

Wire.write((speed >> 8)&0x00);

for the second channel.

Hi @felmue,

Yes, I mean that module.

I will look into the documentation you provided, thank you.

Regarding the number of servos I mandated the student - i teach art students - to scale down from his initial proposal of 24 servos, because of the logistics implied. He came to the class, proposing 13 servos with this module arguing that it should work, so here we are, trying to make it work.

Thank you for your time.

Hello @Thomasx

sorry, I meant this blue one - which is stackable (it's also EOL though).

But if yours is black then guess you have the COMX LoraWAN.

Thanks
Felix

@Thomasx
Please show me the picture.

@felmue said in M5Stamp C3 programming examples:

Hello @ajb2k3

What worked for me on macOS Big Sur 11.5.2 is using the ESP32C3 built-in USB via GPIO18 and GPIO19.

What also worked for me on macOS Big Sur 11.5.2 was downloading and installing this driver CH9102_VCP_SER_MacOS from here. After a reboot and plugging in M5StampC3 via USB this port show up /dev/cu.wchusbserial... (in addition to /dev/cu.usbmodem... which did not work).

Thanks
Felix

Hello Felix
read here for a possible solution.

Hello @NilZ

Note: I do not own an IoT BASE CatM so my conclusions might be incorrect.

Firstly M5Core2 for AWS (orange) is the same as M5Core2 (white) - well, except for the color. The secure element (ATECC608) is in the M5GO Bottom2 for AWS (dark gray). From the specs:

The M5GO Bottom2 for AWS adds additional features and security for IoT applications. ... the onboard Microchip ATECC608 Trust&GO crypto-authentication chip is pre-provisioned with secure keys to simplify connectivity to AWS and accelerate cryptographic computation. ...

In other words to physically stack the IoT Base CatM to the M5Core2 for AWS you have to un-stack the M5GO Bottom2 for AWS first and by doing so you don't have the secure element anymore which I believe is required to connect to AWS. So if you plan to use the SIM7080G to connect to AWS (instead of WiFi) I think the story ends here as you can only have either the SIM7080G or the secure element stacked to the M5Core2 at one time.

If your question however is whether a plain M5Core2 (orange or white) can be used with the IoT Base CatM, then the answer is yes. The only thing you need to observe is that between M5Stack (Fire, Base, Gray) and M5Core2 some GPIOs have been changed - so the Arduino example (which is written for M5Stack) needs to be adapted for M5Core2. This list can help you with that.

Thanks
Felix