Rain Detector
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Rain Detector

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.

Schematic


This is the schematic of the Rain Detector

Parts


Part

Total Qty.

Description

Substitutions

R1

1

1K 1/4 W Resistor

R2

1

680 Ohm 1/4 W Resistor

D1

1

1N4001 Silicon Diode

BZ1

1

12V Buzzer

S1

1

SPST Switch

SCR1

1

C106B1 SCR

106CY

SENSOR

1

See Notes

MISC

1

Board, Wire, Case, PC Board (For Sensor)

Notes

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

2. Make sure to use a loud buzzer.


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