0 Simple Rain Detector

Another simple water detector circuit using Nand in 4093b IC. The idea of the circuit is similar to rain alarm circuit that when the sensor is wet, it will activate the relay. You can use the relay to drive motors or any device.
water detector schematic
Part List:
R1 - 470 kilo ohms 1/4W
R2 - 10 Mega ohms 1/4W
C1, C2, C3, C4 - 10nF capacitor
D1, D2 -1N4148 or similar diode
D3 - 1N4001 or similar diode
Q1 - 9012, BC557 or similar PNP transistor
A, B  -HEF4093B or similar Nand 
RLY - 12V relay 
PLATE - piece of conductor separated in few mm
9012 or BC557 pinout
4093 IC pinout


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