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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.
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Part |
Total Qty. |
Description |
Substitutions |
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R1 |
1 |
1K 1/4 W Resistor |
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R2 |
1 |
680 Ohm 1/4 W Resistor |
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D1 |
1 |
1N4001 Silicon Diode |
|
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BZ1 |
1 |
12V Buzzer |
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S1 |
1 |
SPST Switch |
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SCR1 |
1 |
C106B1 SCR |
106CY |
|
SENSOR |
1 |
See Notes |
|
|
MISC |
1 |
Board, Wire, Case, PC Board (For Sensor) |
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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