With Option #1, will weather adjustment or anything of that sort throw the timing of the master valve out of alignment with the rest of the program? I think the answer is “no”, but I’m not certain. I’ve toyed with the idea of using some of the manual “on/off” type tools and a script to deal with one of the masters (used infrequently) and then just use the other master for everything else.
Option #2 means I need to buy expansion boards. Might have to anyway. *shrug*
What I’m up to is the second master actually redirects things through a fertigation unit for when I want to fertilize.