People have to face to various problems because of not having proper way to know the rain before it comes.So through this circuit you can detect rain comes or not.When a small drop water falls on the sensor Circuit gives a sound.you can use this one for various purposes.As an example you can use this one to detect your over flowing water tank.And I myself have used this one for various things....
Parts
D1 1N4001 Silicon Diode
BZ1 12V Buzzer
R1 1K 1/4 W Resistor
R2 680 Ohm 1/4 W Resistor
S1 SPST Switch
SCR1 C106B1 SCR 106CY
SENSOR See Notes
MISC Board, Wire, Case, PC Board (For Sensor)
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