Success! I can now remotely turn on my sprinkler zones via my Arduino-powered web server.
The picture does not do justice to the amazing amount of wiring nuts I used to make this work. I think there are nearly a dozen of them holding all the wires together.
I did not manage to hook the Toro controller's 24-volt power supply into my rig. Sharp-eyed readers might be able to spot the two 9V batteries I clipped into my valve control circuits as a temporary power supply.
Anyway, it works! Awesome! Now to write the native Android controller app...
Edit: I have since torn down this setup so that I can mount my Arduino hardware on something a little more substantial (and less flammable) than cardboard. Stay tuned...
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