I'm playing a thunderstorm sound with an Arduino with ethernet module and MP3 module.
Now, I would like to add some lighting and I would like to program the exact time when it will flash. -> for exemple "afer 3 second, then after 5 second, etc...
I know that using delay is not a good thing if I want to be able to contact my arduino from ethernet but it's seems hard to use millis in that case.
What would you recommend ? using a second arduino ?