<![CDATA[M5Stack Core2 Which Pins can I use???]]>I have an M5Stack Core2 AWS and working on designing a project.

I haven't been able to find a document that really tells me which pins I can and can not use.

I need 3 Comm Ports (probably 2 will use EspSoftwareSerial) and 2 other pins, a Digital Input and a Digital Output. I don't see where RXD1/TXD1 (has a UART) pins are available!

For the Core2 the pins are listed:
M5StackCore2Pinout.jpg

From (hours of) studying, the ones that I don't think that I can use are:

  1. intSDA/intSCL (I2C Port, I'll have a 4 relay board that I'll have installed that uses I2C).
  2. RXD0/TXD0 (used for USB Comms)

Are there other pins that are RESERVED? (besides the obvious: GND, RST, 3.3v, 5v & BAT)

What I THINK I CAN USE:

  1. I can use the RXD2/TXD2 for my most important comm port.
  2. G27/G19 as my first SoftwareSerial RX/TX Ports.
  3. G25/G26 as my second SoftwareSerial RX/TX Ports.
  4. G35 & G36 as my Discrete Input and Output pins.
    (I have a MAX3232 Serial Interface chip that I can use with 3.3v power.)

Is this correct?
Are there any other pins that I could use?

Thanks for your help!
Sir Michael

]]>https://community.m5stack.com/topic/7047/m5stack-core2-which-pins-can-i-useRSS for NodeWed, 29 Apr 2026 23:34:13 GMTMon, 02 Dec 2024 14:59:47 GMT60<![CDATA[Reply to M5Stack Core2 Which Pins can I use??? on Wed, 11 Dec 2024 04:29:32 GMT]]>@SirMichael

I did some more studying, and came up with the following table:

2d232859-84b4-4421-9143-baaf384d0c65-image.png

I hope this is right!
Now, I'm not using the M5Stack bottom board which has the PortB and PortC, so I figure that I can use the RXD2/TXD2 pins as well as the G36 and G26 pins. I'll use those for the other 2 SoftwareSerial ports, and G27 and G19 for the other pins.

The thing that I found confusing was that they do list the pins in the M5Stack documents, but they don't really explain what is available to the user. This took a lot more work than it should have!

Sir Michael

]]>https://community.m5stack.com/post/27417https://community.m5stack.com/post/27417Wed, 11 Dec 2024 04:29:32 GMT<![CDATA[Reply to M5Stack Core2 Which Pins can I use??? on Tue, 10 Dec 2024 14:31:23 GMT]]>@kuriko

But the question gets to be, using the pbhub_1.1, can I somehow communicate from the I2C port (PortA) with a Serial Port?

I can't seem to find an I2C to Serial Converter...

Sir Michael

]]>https://community.m5stack.com/post/27416https://community.m5stack.com/post/27416Tue, 10 Dec 2024 14:31:23 GMT<![CDATA[Reply to M5Stack Core2 Which Pins can I use??? on Tue, 03 Dec 2024 02:23:20 GMT]]>@SirMichael
9c8fd8ff-b123-40b8-b941-5b1d7066e6de-image.png
yes i personally think you're mostly right
and, maybe you can try out PbHub to expand ports?
https://docs.m5stack.com/en/unit/pbhub_1.1

]]>https://community.m5stack.com/post/27314https://community.m5stack.com/post/27314Tue, 03 Dec 2024 02:23:20 GMT