Rain Detector Circuit Schematic Diagram

This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system. parts :

R1—————————1K 1/4 W

R2—————————680 Ohm 1/4 W

D1—————————1N4001 Silicon Diode

BZ1————————-12V Buzzer

S1—————————SPST Switch

SCR1———————–C106B1 SCR

SENSOR1——————See Notes

MISC1———————-Board, Wire, Case, PC Board (For Sensor)

note : The sensor is a small piece of PC board etched to the pattern shown in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.

source : www.aaroncake.net

Rain detector1

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