M5Stack Core2 Which Pins can I use???
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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:
From (hours of) studying, the ones that I don't think that I can use are:
- intSDA/intSCL (I2C Port, I'll have a 4 relay board that I'll have installed that uses I2C).
- 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:
- I can use the RXD2/TXD2 for my most important comm port.
- G27/G19 as my first SoftwareSerial RX/TX Ports.
- G25/G26 as my second SoftwareSerial RX/TX Ports.
- 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 -
@SirMichael
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 -
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
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I did some more studying, and came up with the following table:
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
