17-11-2012, 05:12 PM
Home Security
[attachment=40068]
INTRODUCTION
In designing some precious things security is of prime importance.
Security is becoming essential day-to-day due to increasing theft. Security should
not be expensive then the think to be secured.
This project guides us with a low cost security. To protect our house
or any precious things from thieves or trespassers for designing any thing new
security should be viewed first.
This project gives us a security system, which insures safety and
security very conveniently. It is simple as it wcrks on a simple laser beam and a
proper mirror arrangement around the thing to be secured. By networking the
laser beams through reflections of mirror and by blowing the alarm if any one
crosses the beam and indicating “security in danger”.
The system convenience comfort of the user it uses the most advance
technology. Innovation quality assurance and reliability are silent features of
system.
BURGLAR ALARM
In this system invisible radiation like ultra violet rays or infrared
rays fall continuously on photodetector. When burglar crosses the path of beam,
the current in photodetector is cut off. The relay in the circuit is set in such
manner as to be operated due to this break in current and it starts the ringing of an
alarm bell.
Burglar Alarm using Photo conducting cell :-
Here is simple circuit, which uses photoconductive cell LDR (light
dependant resistor). The LDR is made up of cadmium selenide or cadmium
sulphide. Its resistance is very high when it is dark and its resistance falls
considerably when it is illuminated. This light dependent properly of LDR is used
in construction of Burglar alarm system.
When LDR is illuminated by light from the resistance of LDR drops
to few ohms and transistor emmiter base junction in forward biased. This make
the transistor to go in saturation and sufficient current flow through the relay coil
this current is sufficient to actuate the relay. The between in relay ckt will not
work .
SPEAKER :-
Speaker is used for siren purpose. which provides a noise whenever
security is danger.
Speaker is a device which converts varying electrical signal into a
proportional sound signal.
MIRRORS :-
For reflecting laser beam combination of plain mirrors M1 through
M4 is used to direct the laser beam around the house to form a net.
FLEXIBLE WIRES :-
Flexible wires are most important as a complete circuit. On a PCB
can only be obtained from wires. Flexible wires are used for connection purpose.
The most important purpose is conduction. Flexible wires may have single or
multi-strength of metal. They are used as per current capacity. These are insulated
wires and has a low current carrying capacity and soldering metal is used to solder
electronic components on PCB with the help of soldering.
Govt.
[attachment=40068]
INTRODUCTION
In designing some precious things security is of prime importance.
Security is becoming essential day-to-day due to increasing theft. Security should
not be expensive then the think to be secured.
This project guides us with a low cost security. To protect our house
or any precious things from thieves or trespassers for designing any thing new
security should be viewed first.
This project gives us a security system, which insures safety and
security very conveniently. It is simple as it wcrks on a simple laser beam and a
proper mirror arrangement around the thing to be secured. By networking the
laser beams through reflections of mirror and by blowing the alarm if any one
crosses the beam and indicating “security in danger”.
The system convenience comfort of the user it uses the most advance
technology. Innovation quality assurance and reliability are silent features of
system.
BURGLAR ALARM
In this system invisible radiation like ultra violet rays or infrared
rays fall continuously on photodetector. When burglar crosses the path of beam,
the current in photodetector is cut off. The relay in the circuit is set in such
manner as to be operated due to this break in current and it starts the ringing of an
alarm bell.
Burglar Alarm using Photo conducting cell :-
Here is simple circuit, which uses photoconductive cell LDR (light
dependant resistor). The LDR is made up of cadmium selenide or cadmium
sulphide. Its resistance is very high when it is dark and its resistance falls
considerably when it is illuminated. This light dependent properly of LDR is used
in construction of Burglar alarm system.
When LDR is illuminated by light from the resistance of LDR drops
to few ohms and transistor emmiter base junction in forward biased. This make
the transistor to go in saturation and sufficient current flow through the relay coil
this current is sufficient to actuate the relay. The between in relay ckt will not
work .
SPEAKER :-
Speaker is used for siren purpose. which provides a noise whenever
security is danger.
Speaker is a device which converts varying electrical signal into a
proportional sound signal.
MIRRORS :-
For reflecting laser beam combination of plain mirrors M1 through
M4 is used to direct the laser beam around the house to form a net.
FLEXIBLE WIRES :-
Flexible wires are most important as a complete circuit. On a PCB
can only be obtained from wires. Flexible wires are used for connection purpose.
The most important purpose is conduction. Flexible wires may have single or
multi-strength of metal. They are used as per current capacity. These are insulated
wires and has a low current carrying capacity and soldering metal is used to solder
electronic components on PCB with the help of soldering.
Govt.