Trigger from Arduino into OpenBCI

Hello,
 I created a test with a pushbutton in Arduino (NG version) and would like to incorporate the pushbutton signal (once the button is pressed) into the OpenBCI (v3-32bit) board.
 Ideally, I would like to do that in a way that in the output text file from OpenBCI processing GUI, one of columns is related to the pushbutton so I can check when it was pressed.

I saw there's this tutorial for external trigerring:
http://docs.openbci.com/Tutorials/06-External_Trigger_Cyton_Example

But, since the output is from Arduino, maybe there's an easier way?
Any suggestions?

Regards
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