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[on:]

I have a project that I'd like to do which would basically just alert me if water is detected. We have a basement location and with some storms, water creeps in when no there, which is a bad thing. I've searched this forum as well as the internet without much luck on what type of sensor would be used for something like this. Something I could run the wire next to the door, and just stick it in a corner location, so when water came in, it would immediately detect the moisture.

Electronics newbie here so forgive me if this is a super simple question. One thing to note there are small children in the area so I'd like to have something that's clean and protected.

Thanks!

[Reply #1 on:]

water will conduct electricity so putting two nails in the place you want to measure 1 cm apart, connect one to 5V and the other to an analog input.
connect the analog port with a resistor to GND too and you have a minimal system to check for water.

[Reply #2 on:]

Similar recent discussion here:
http://arduino.cc/forum/index.php/topic,152516.0.html

[Reply #3 on:]

I would use this sensor…

http://www.robotshop.com/productinfo.aspx?pc=RB-See-186&lang=en-US

http://www.robotshop.com/content/PDF/grove-moisture-sensor-sen92355p.pdf

[Reply #4 on:]

Perfect, thanks everyone! I think I'll give the sensor listed a try.

I appreciate the help!

[Reply #5 on:]

You could use just two wires as a conductivity tool. One would be VCC+ and the other one would be connected to a pin that would sense the voltage fro the VCC+ with the analogRead() function. When the two wires contact the water the flow of electricity become higher and that way you could detect if there is any water.