Min and max combined take less cpu time than ‘if’ so:
if(max(min(flow,max_threshold),min_threshold))!=flow){stop};
would be faster, and easier (clock cycles not readability) on the arduino based systems. Even though I don’t know how close everything is running to max capability of the chip, allowing for future features is nice.
@tom how would the OS know while scheduling that it could place several zones together? Or were you thinking A) run a test and then schedule them, B) have it continue to add zones till capacity is reached?