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Rain Detector Circuit

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.


This is the schematic of the Rain Detector








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)

NOTE:
  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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