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Rain AlarmAugust 21, 2013 Electronics Project

GIVES BEEP WHEN WATER IS IN CONTACT WITH THE WIRE

Rain Alarm Project

Water is a conductor of electricity. When water is in contact with the probe then there is a flow of current which reaches to the base of Q1. Transistor Q1 is a NPN transistor which conducts. With the conduction of Q1 electron reaches to Q2 which is a PNP transistor .Q2 also conducts and current flows through the speaker. In a speaker there is inductive coil which causes motion in one direction and also produce induce current which is in opposite direction to the flow of current this induce current in the form of pulse flows through a capacitor, resistance and switches off Q1 and relax .this process repeats again and again till probe is in contact with water or we can say there is a oscillation in the circuit thus speaker diaphragm vibrates and gives a tone. Frequency of the circuit depends on the value of Speaker Coil impendence, Capacitor and Resistance Value.

Circuit Diagram of Rain Alarm

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8 thoughts on “Rain Alarm”

1. Ashutosh Chauhan

August 27, 2013 at 9:45 PM

it is a very good website for engineering students.

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2. Shilpa Chowdary

August 31, 2013 at 4:34 PM

It is very useful 2 Engineering students

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3. Ramendra

September 8, 2013 at 11:40 AM

Thnx for such a wonderful website.

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4. J.Roseline

September 15, 2013 at 10:08 AM

its such a awondeful website for all engineering students

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5. khushbu mistry

September 16, 2013 at 12:59 PM

can you tell me that which prob is used in this ckt..?

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1. admin

September 16, 2013 at 11:46 PM

Any metal with small gap in between can be used as prob.

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6. Adarsh

September 20, 2013 at 11:56 PM

very useful website fo electronic students…..

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7. imthiyasmeen

September 22, 2013 at 12:44 PM

it is awesome for NTTF students

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