July 06, 2009

Rain Detector

10:26 PM  Sabarish  No comments

INTRODUCTION
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.

circuit diagram:-


This is the schematic of the Rain Detector



parts required

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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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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