currentTime doesn't have to be a global variable. You could remove the line `unsigned long currentTi

currentTime doesn't have to be a global variable. You could remove the line

unsigned long currentTime; // max. 4,294,967,295 (50 ays)

unsigned long currentTime; // max. 4,294,967,295 (50 ays)

and change the first line of loop to

unsigned long currentTime = millis()

unsigned long currentTime = millis()

. That would make currentTime a local variable inside loop()

currentTime doesn't have to be a global variable. You could remove the line `unsigned long currentTi - Arduino