Felix,
I purchased the IOShield for my sprinkler controller, 16 zone version of Felix's, and everything is soldered, programmed, and wired. Works great! Now on to my issue;
Like Felix's, there is an extra triac which controls MV terminals on the bottom terminal strip. This I believe stands for "Main Valve". I use this in my system, being on well water, to control a relay that turns on a Rid-O-Rust system pump. This MV was programmed in the controller to come on whenever zones 1-8 came on which pumps a solution into the line to help prevent rust stains. Zones 1-8 are zones that are close to the driveway, sidewalk, and the brick of the house.
Reading thru the IOShield sketch there appears to be some code that only allows 1 zone on at a time. Although I like that feature, I'm looking for suggestions (code) on the best way to allow zone 17, rid-o-rust relay, to come on with certain zones at the same time. Hope this makes sense.
Any help would greatly be appreciated,
GM