Researching communication methods between Arduino and M4

Projects General Guidance
1

Hello all,

I want to be able to send messages from my Arduino to Adafruit MatrixPortal M4 What I envision is sending data via serial communication, but I am not seeing any Serial ports on the M4. The only thing that I am seeing that might enable the communication are the digital ports of: A1 to A4. This information is noted at the top of page 13 in the link above.

The basic parts of this project are:
ARDUINO SIM - MKR GSM 1400 Cellular Kit - This is my remote command and control method.

I envision sending data from the Arduino to the M4 to control what appears on the Adafruit Matrix Portal

2

Page 12 of the Adafruit M4 document you linked to shows the location of the serial UART pins.

3

Yikes! I feel like an idiot. I guess I just matchup the TX and RX ports respectively, right?

4

I decided to double check the MKR GSM 1400 but it does not have Transmit and Send ports. The documentation says that it has UART communication though. What am I missing?

5

Never mind, I found the Tx and Rx. They are labeled UNDER the board. Though, I am worried if I SHOULD buy this model since the 3g is going away at the end of this year. The Arduino MKR NB 1500 is SOLD OUT though...

6

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