"4.My ideas for gadgets to connect to this in future are; Moisture sensors, leak detectors, flow detectors, dye injectors (so you can water with a non---toxix dye and see where your zones hit/miss after a 1 min run on each zone. The dye will disappear from the next watering. Valves that report faults/flow/stats (low power, solar perhaps). I also want to look into remote zones (WIFI connected) that don't to be connected by wire to the RACHIO directly but can be on any WIFI. Again, solar. Anyway, lots of cool ideas from all of us in this community I see posted."
Take a look at 3 charts, Water Usage - 15 hr History, Daily Water Usage - 13 mo History, and Monthly Water Usage - 13 mo History, all part of the charts at http://www.welserver.com/WEL0343/ .
This is an example of integrating my Rachio system to my energy monitoring system via using the Iro's Pump On/Off control terminal.
Nice write up. Enjoyed reading. Believe you'll need to search for Wi-Fi enabled moisture sensors coupled with Rachio support for a cloud-to-cloud data transfer in order to implement closed loop water control. The Iro hardware wise is not well set up to accommodate hard wired moisture sensors.