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Data acquisition and data logging schematics

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

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

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

Make sure to use a loud buzz





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