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