There is always a problem in our home whenever we switch on the motor to fill the tank with water. So, we have decided to solve the problem by making a circuit which senses the rain/water
Rain Alarm:
This circuit is built around just two transistors as the main active components
so as to warn about the rain. Also the same circuit can be used as water level
indicator by arranging the sensor at the top of the tank.
Operation:
The
configuration is in the form of a standard Darlington pair, which increases its
current
amplification
capacity hugely. Rain drops or water drops falling and bridging the base with
the positive supply is enough to trigger the alarm. The purpose of Resistor
and Capacitor
is to insert some delay so that the transistor is on for some time (R*C=2.2mS)
and so the Piezo Buzzer starts ringing. The whole
circuit is given 9V D.C power supply.
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