mrburnette:
There is another timer, micros() that implements every microsecond.
Strictly speaking it increments by 4 every 4 µsecs.
ericgfx:
I want to use the Millis interval check just to get the practice of using it, but for my purpose seems overly complex. As I understand it, the millis interval check is great for doing processes simultaneously, but for this project I execute one process at a time.
It is certainly not obligatory to use millis(). But you might want to think about the fact that it is very time consuming to convert a program that has extensive use of the delay() function if, at a later stage in its development, you find that you really do need to use millis().
...R