How to interface this no nc c switch with arduino

[oussy29]

@J-M-L

so you are not going back to the loop where you test the button.
➜ get rid of all delays (that are more than a few ms) if you want no perceived lag in user interaction. The loop needs to run fast and never be stopped or blocked somewhere

i want to make 4h delay between 0 to180 and 180 ==> 0
and i want to keep the led on during the same delay once the switch is clicked...
i didn't get how to do it.. i just get this code and made some modifications as i know because i sill beginer