Ok, I can do it. Make a controller for the automatic diversion valves (and thus the indexing valves as well.)
Definitely nothing fancy. Now I have not worked out any elegant way to be able to change the programing in the field so if I made one of these for you, I would need to know what sort of timing schedule you wanted so I could pre program it. Right now my prototype is running 5 minutes per side.
I still need to work up the price for one of these.
Let me know what you might be willing to pay for it seeing as to do it without a custom made control requires some form of repeat cycle timer, a power supply to plug into the timer to control a spdt relay that can control switching the 24VAC power supply to the different sides of the actuator.
So the cost for the above listed parts for me was
$75-$85 for a repeat cycle timer
$16 for 24VAC power supply for actuator
$12 for 12VDC power supply to switch the relay
$5 for relay
$2.19 for circuit board
$10 for wire, tape, solder etc and bucket to put over it all to keep rain from frying the non outdoor electronics that I couldn’t fit into a box.
Total $120.19-$130.19 (and that doesn’t include the price of the soldering iron or other tools needed for doing electronics, nor the shipping or taxes on those materials, let alone the time to figure it all out or the trial and error and education along the way.) So what I’m saying is if you want to just fudge it on your own, you probably can with the above listed inelegant bundle of parts. This would be far more appropriate to indoors where you wont’ be worried about it getting rained on.
Now if one wanted to build their own, they are not especially complex and the programing board isn’t especially costly because it is based on the PICAXE 08M chip and the software is free and there are free forums that can teach how to use them. I am estimating the cost to build one of these yourself (if you already have the tools for soldering and playing with electronics) to be around $110 including the nice weather resistant box.
I’m currently in the process of sourcing parts so I can put together more of the above pictured basic timers but these will be very basic just meant for timing the diversion valves. If you want any additional features or control I will recommend the Bigelow Brook Farm IX Series Sequencing Timer