I can't help on the Arduino stuff except for the most basic of stuff (yet).
 
I do remember seeing an article about a home made sensor using wires and table salt encased in paper.  When the paper gets wet, the ionized salt + water conducts electricity.
 
On Sat, Aug 18, 2012, at 09:00 PM, Eric Martin wrote:
Hey all,
 
I had a close call with my hot water heater this afternoon.  I heard on odd noise in the pipes and it turned out that my hot water heater was dumping water out of the overflow valve.  Luckily, I found it quick enough, and I'm pretty sure I got it handled for < $150.  There's a 1 Gal bucket under the overflow valve, and if I had a water level detector emailing me that water is in the bucket, I could have caught this earlier.
 
I was looking at buying an Arduino and setting up a simple circuit.  I know a few people have played with Arduinos, any suggestions on which one to get and how to go about it?  I don't need to know how much water is in the bucket, I was thinking about a float type device or even two wires that trip a relay.  I just want a heads up that water is in the bucket so I can stop before my basement floods.
 
Thanks in advance,
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Eric Martin
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kstratton@fastmail.us