While work was closed for the holiday shutdown, I did one more thing to the system, adding an Orbit Rain/Freeze Sensor. It's connected to a DS10A and relays to the system whether or not to turn on the sprinklers. I've been mainly relying on weather forecasts to control the sprinklers but this adds an extra data point, especially since we're having voluntary water rationing in our area.
I'm back at work now, so updates will be as sparse as before. It was a productive week and a half though.