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As for the alarm, it's a nice idea. But, for me, it would be more useful if it dialed my cell phone when it went off. Odds are, I'm not gonna be home when it pops.
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Actually, this is very doable, but you will have to involve your alarm system guy. You have to have 1) an alarm system on your home and 2) an active telephone line. I was working on this after thinking...if my alarm system can dial 911 or a monitoring company, then I know you can program your cell phone # in there instead. It works. Now, we just have to make the house alarm go off when the water detector alarm goes off. Easy, have your alarm guy install a sensor nearby the detector, very much like a glass-break sensor. The sensor will pick up the loud noise coming from the water alarm, thus setting off your house alarm, thus dialing your cell phone.
Here's the only problem I have found. When you answer the cell phone, obviously there will be nobody on the other end. If you just look at the caller ID on the cell, it will be YOUR home phone. So, in my case, I don't know whether to call the police, or if one of the kids are screwing around, or the wife set off the house alarm by accident. I guess if you are out, with your family, and you get the call, you know something legit is up.