Dear Marco,
I had connect both MR (master reset) pins of 4017's to pin 10 of Arduino (i did changes today, to late for yesterday).
Now seems that every time finds the right key pressed but i dont know how to connect clock pins.
Acording to article with 2 4017's first ic clock comes form MCU and the last output goes to clock pin of second 4017.
Maybe I have to arrange different the connections. If I let it as is I got 2 issues.
Fisrt is that keys starts from number 4 and i dont have all numbers, last key doesnt work.
Do you have any idea?
Thank you in advance.
Stavros