ATHENS 
MY WEATHER STATION, BY DIMITRIS
Location: Peristeri of Athens, Greece
Position: 38 00.58' NORTH / 23 42.04' EAST
Elevation: 63 meters
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Rain Detector
I make a rain detector,it work when start to rain,external sensor is the out side pcb with parralel wire it make a short cut to electronic circuit,and a buzzer warning.The original consept and design is from .www.techlib.com.But i make a modifications at transistor Darligton type, because the original design the buzzer it was not strong.

Here it is the electronic design Here it the electronic material,plastic boc,case for batteries,switch on-off,jack,resistors,capasitors,transistors,cable,except one transistor BC 547. Here i kame holes to plastic box for install the switch on-off,buzzer,rca jack for external sensor.
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Here it is ready the rain external sensor. Here it is ready the the rain external sensor for the other side. Here it is ready the main unit circuit.
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Another one photo the main unit circuit . And from the other side . Here it is ready in a plastic box
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View from left side it is the switch on-off and buzzer . View from right side it is the jack for external rain sensor . And here it is completely finish.
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Click here for you see video.
Click here for a demonstration video