I wrote an Arduino bare bones server for the Sparkfun esp8266 shield which is based on Jim Lindblom’s code. It has some JSON and URL support to my Linux client. The GitHub here https://github.com/str255/esp8266-irrigation-controller with GNU GPL. I’m blogging my overall Home Automation project at http://rivermountainlooptrail.blogspot.co.uk/ 
Looks very cool so far.
Maybe adding a mobile app to control it
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