I will try to use them but the program does not compile properly.
For example I use this function: "char getKey () -Returns the key pressed That Is, if any. This function is non-blocking"
in this way:
char key = getKey ();
and so does not compile .. while the same function used in their example becomes:
char key = keypad.getKey ();
this is not the same thing. is not it? and why?