0 Homemade Rain Sensor

Simple construction of a rain detector.  

Rain to the news about the project can make a detector.

Let's add the first step materials.

9V battery
1 Piece Plastic cups
2 x paperclippers
1 Piece LED
Adequate cable
And plenty of black (electrical) tape
That's all.

 
Here is the schema;

 

And running state of the junction of these materials

 

To test, put one fourth of salt in the plastic glass. Then fill the cup with water and When you did these steps, the led will light. 

That's all.