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this is an example of a very simple water sensing circuit that is in an Altoid mini tin. Very common circuit, but the Altoid mini fits a 9v battery so well, i couldn't resist. Of course make your leads longer to suit, this length was simply to test.
The way the circuit works is through the changing of resistance when the two leads are submerged. When a dry condition is read, it's simply an open circuit, but when submerged, the conductivity of the water closes the circuit, turning the led on.

Step 1: The Parts

The nice thing about this project is that you only need a few items and a few minutes to be up and running.
The parts:
- Altoid mini tin
- led
- resistor
- led trim housing (optional)
- 9v battery
- battery leads
- wire (determined by the length of leads required)
- electrical tape (did a rough tape up with a piece of plastic between the wires just to keep them apart for the test unit)

Step 2: The Wiring Schematic

Step 3: The Final Product

the first photo shows the state of the led when the leads are dry. the second, when the leads are placed into water.
This simple project took only a couple of minutes to make, but is very effective.

Step 4:

<p>is there a specific resistor u need because mine isnt working</p>
<p>is there a specific resistor u need because mine isnt working</p>
<p>now you just need to find a way to add a beeper so this can left by a water heater, under the sinks, and any place there is a water source so you can be alerted to water leaks</p>
great idea! would be very easy to do as well.

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