Thank you very mcuh for the fast answer Felix!

You are right, got one relay working with GIPO19 and digitalWrite(19, HIGH)

But no succes with GPIO27, voltage does not change to 3.3V with digitalWrite(27, HIGH)... strange

There is only 2 free GPIO to use? because I have 2 relays to connect but also one line with DS18B20 sensors and another with a water flowmeter.

Hi,

I have an issue connecting relay to my Core2.

Here is my schematic:

Nothing happen when changing PIN21 state...

Is G21 the good PIN to use?

I tried G15 and G12 too, without succes using this command:

pinMode(12, OUTPUT);
digitalWrite(12, HIGH);

What am I doing wrong?
Which pins are available for my need, and what are the numbers to use in digitalWrite?

Thanks for your help

@lukasmaximus Same question here, but which module use to add an external wifi antenna. I need a longer range.

@m5stack Thanks to take it into consideration.
I received my Core2 today. Trying to plug the PLC circuit after removing the bottom seems difficult. On the left side there is a metallic thing (motor?) that push the circuit, and pin headers are really short.

About headers, you sell SMT mount connector in your shop but I think they are 2.5mm long (like the old modules one's)? right? on the micro-module they are 3.5mm (total height 5.84).
For makers like me, if we want to build modules prototype, where can we find compatible trough hole or SMT connectors? I search and found nothing? any ref?

I ask M5stack support, here is their answer:

"The 30-Pin connector we are using is a customized one. The pin height with 3mm is no problem to be compatible."

Hello,

Does anyone find a solution to this?
I am ordering a circuit at PCBway but they can't order components at M5stack, and I do not find male header anywhere.

It looks like it is a SAMTEC connector (low profile), see picture.
http://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf

But lead style A is 3.05mm (pin height), mesuring the one I have is 2.5mm.
Not sure 3mm will fit the femelle (too long)?

Thanks

Hello,

I am using the PLC for a project.

When the PLC is connected to 12V power supply, is it safe to connect Core to computer with USB cable?

Will the full project, assembled Core on PLC work with only Core on USB (without 12V power supply on PLC).

And last question, what is the BAT pin on PLC circuit?

Thank you!

Will Core charge internal battery when the only power supply is 12V on PLC?

@m5stack I will use this module too, and need more informations. Can you provide schematic for this circuit? what relay do you use?

Hi,

I am creating a circuit based on PLC M12 module.
Is there any plans available (gerber, bom..) to download to avoid recreate it?

Thanks

@efried Found solution here : https://community.m5stack.com/post/1394

Add dacWrite (25,0); into the void loop