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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
R111K 1/4 W Resistor
R21680 Ohm 1/4 W Resistor
D111N4001 Silicon Diode
BZ1112V Buzzer
S11SPST Switch
SCR11C106B1 SCR106CY
SENSOR1See Notes
MISC1Board, 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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