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Since I posted this, I found that that either mechanical switches or piezoelectric with ipx5,6 or 7 ratings failed when exposed to rain, sun and Florida’s high humidity. I therefore ended up using a garage door type sensor. It in turn operates a relay starting both OS devices. The sensor is mounted only 3 to 4 inches apart. I had to block almost all the transmitter output and receiver input with electrical tape. Only a very small slit of light is allowed. When one puts a hand between the sensor a relay activates starting the OS. In your case the second relay is not needed. They are “xin-sheng 1 pair Waterproof Single Infrared Beam sensor Photoelectric Infrared Barrier Detector” from Amazon. This is very inexpensive and will work with 24V AC.
Using city water sounds expensive for a splash pad if it’s used a lot. Programming the OS was the easiest part. Don’t expect the standard sprinkler valves to create the pop effect of some commercial splash pads. We use the same sprinkler valves and the water comes up reasonably fast, but no pop.
I am using open sprinkler DC for a splash pad. At times we would like to run multiple sprays during the program cycle. In the middle of the program cycle we would like to run the some of same sprays at the same time. Then also in the cycle some of the sprays come on at other than the fixed sequential negative delay. The problem with manual setting is they come on only at the beginning of the cycle.
In other words sprays could be turned on at any sequence after the Program Switch.
See the attached timing diagram as an exampleIf the Manual setting of the individual zones had a start time (H,M,S) after the Program Switch and any other start method, it would make the controller much more flexible. Multiple zones could be started before and after a sequence. This would give zone control nearly unlimited flexibility.
