Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);Keypad customKeypad2 = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
Code: [Select]Serial.begin(9600);That needs to be in setup, not in your addFingerPrint function. I'm not sure but I think calling it more than once causes some sort of problems.
It didn't make you have to remove the serial print. What are you talking about? If you have a begin in setup then you can use serial anywhere in your sketch.
Which brings us back to the question in reply #2 that you haven't answered.
Still, why have two identical objects in your code. That may have something to do with your problem. I don't know enough about that keypad library to be sure. But it's definitely not right and should be fixed.
As I said, I tried both ways, with no 2 identical objects either, always the same problem, its just wont work.