I was thinking an old wrt54g running something like ddwrt to base a basic two or three valve controller. You wouldnt have a screen though. Guess you could add one of the ddwrt screen hacks.

I’ve had this Rachio Smart Sprinkler Controller installed for a while now, replacing my (very) old Rainbird controller. Honestly, I completely forget that I have this device installed.

What to do once you have a sprinkler system installed on your property: buy a sprinkler control system or make your own? The latter, obviously. [danaman] was determined to hack together a cheap ...