I have no experience designing electrical circuits and I would like to try building a control system for an underground sprinkler system. Is this something I can do with a few trips to Radio Shack, or is this way too complicated? Basically, I was thinking of having moisture sensing transducers buried throughout my backyard, and based on the moisture level and time of day, the system would decide whether to activate the sprinkler system. I'm guessing I would have to correlate the rate at which the moisture level increases when the sprinkler system is on, so I know how long to keep the sprinkler system on to get the moisture level within the control range. It would really be nice if I could make each sprinkler head independent and only water specific areas that require it. Does anyone have any thoughts on this?