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The fear of theft and burglary always annoys many people. When lock and keys become
less safe, one can seek the help of electronic security systems. Such a portable
security system is described here. This electronic setup auto activated whenever
the intruder enters to the unauthorized no entry area. It auto activate the landline
number and redial the last dialed number from the conventional telephone. All we
need is to do minor changes to activate this telephone as it works as to become
auto dialer circuit. Thus whenever the intruder enters to the area, it activates
the sensor circuit of either sound activation or infrared light beam obstruction
circuit, the redial circuit become active and give a ring tone to the receiving
end. It may be a mobile phone or any landline phone or even police control room.
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AUTOMATIC ROOM LIGHT CONTROLLER WITH BIDIRECTIONAL VISITOR COUNTER PROJECT FOR ELECTRICAL ENGINEERING
Project Working:-
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This Project ―Automatic Room Light Controller with Visitor Counter using Microcontroller
is a reliable circuit that takes over the task of controlling the room lights as
well us counting number of persons/ visitors in the room very accurately. When somebody
enters into the room then the counter is incremented by one and the light in the
room will be switched ON and when any one leaves the room then the counter is decremented
by one. The light will be only switched OFF until all the persons in the room go
out. The total number of persons inside the room is also displayed on the seven
segment displays.
The microcontroller does the above job. It receives the signals from the sensors,
and this signal is operated under the control of software which is stored in ROM.
MicrocontrollerAT89S52 continuously monitor the Infrared Receivers, When any object
pass through the IR Receiver's then the IR Rays falling on the receiver are obstructed
, this obstruction is sensed by the Microcontroller.
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