lloyddean:
My suggestion (which you've seen stated here by others more than once) is to CLEARLY define your requirements.
The reason I'm trying to use "millis" is because when using "delay" the keypad
reads the input only once then does nothing.
I am trying to use the keypad to control the binary counting on LEDs.
There are number keys (0,1,2,3,4,5,6,7,8,9) and operator keys (* and #).
I want to use the operator keys to either increase (pressing #) or decrease
(pressing *) the binary counting by the value of the number keys pressed.
Perhaps it would be nice to read two number keys at the time (going up to 99)
followed by an operator key.
To make it even more simpler:
2+5+'#' would count up by 25 (in binary)
I will try your last suggestion and also "HasardsMind's" suggestion.
In fact I'm working now on them.
I'll let you know about my progress.
Regards