Working principle:
The rain detector mini project is very simple. Here in this
mini project we are using a pair wires left open and placed in a small plastic container.
Whenever raining starts, water get collected in this plastic container.
As water is a good conductor of electricity the contact between two open ended
wires takes place and current start flowing towards base of NPN
transistor. Here collector of NPN transistor is connected
to the base of PNP transistor. Therefore when NPN starts
conducting PNP also starts conducting.
Due to conduction of PNP transistor current starts flowing through
the speaker and it generates alarm. As in this mini project we have used
a resistor and capacitor in series it causes first transistor to turn
on and off continuously till there is rain water present in the plastic
container. This on and off period depends on the values of capacitor,
resistor and inductive coil of speaker. Because of capacitor charging
and discharging period it continuous to turn on and off continuously. Due to which alarm or buzzer rings.
And this is how this stuff works. Hope you people enjoyed making this mini project. Well keep up the spirit for learning and try some other mini projects listed here in this blog. To know more about transistors or if you have any question or doubt please leave a comment below. Have a nice day !
If you want to make this project for your school science exhibition or as a hobby, simply call to the number given below or mail me to my email id and you will get this entire project stuff or kit delivered to your home (only in Bangalore) with an extra deliver charge of 25 Rs. Good Luck :)
If you want to make this project for your school science exhibition or as a hobby, simply call to the number given below or mail me to my email id and you will get this entire project stuff or kit delivered to your home (only in Bangalore) with an extra deliver charge of 25 Rs. Good Luck :)
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