Yes i understand your code and your right, iīm using it with a subroutine, and with your explanation i understand what a shell is (an oil pump )
I used your code with a little modifications... now i have to build my hardware and test it.
I know that with pause the program doesnīt check anything, but in this case (only in 2 inputs), thereīs no problem. If you see i'll make some of my outputs high during 20s or 40s with pause. and in this time i donīt want to see any input.