Rain Sensor and Alarm
The sensor made of 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. A loud buzzer used as an alarm.
Rain Detector Parts List
R1 = 1K 1/4 W Resistor
R2 = 680 Ohm 1/4 W Resistor
D1 = 1N4001 Silicon Diode
BZ1 = 12V Buzzer
S1 = SPST Switch
SCR1 = C106B1 SCR 106CY
SENSOR = See Notes
MISC = Board, Wire, Case, PC Board (For Sensor)
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