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It was a few years ago and I can't find the link. Here are similar projects:
https://gist.github.com/kgsnipes/1688269
https://forum.arduino.cc/t/4x4-keypad-to-set-a-delay-length-for-intervalometer/426929
http://legacy.gamebuino.com/forum/viewtopic.php?f=11&t=1057
lshk
. . . . also, whould you please post the example/tutorial link along with some sample Arduino output so that we may better understand what event sequecnces we are dealing with.