Usimg millis() as a global timer

Projects Programming
1

I want to use millis() as a global timer, however when it rolls over to zero, how do I handle that ?

Cheers
K

2

What do you mean by "global timer"?

3

You could search the forum. There have been many threads on the subject. There is also an article on the playground.

4

I did search the site, but obviuosly not deep enough :slight_smile:

Found the answer here
http://www.arduino.cc/playground/Code/TimingRollover

Cheers
K

5

Use unsigned longs to track time and use a math operation in the compare.

if ( now - start >= desired_interval ) {
/* do whatever */
}

You won't have rollover problems, the answer will be positive and correct up to the unsigned long limit.