This document describes the design and components of a laser-based security alarm system. The system uses a laser beam to create an invisible boundary around an area being protected. If an intruder breaks the laser beam, a buzzer will sound the alarm. The system is inexpensive yet effective for protecting buildings and areas from intruders. It uses a laser transmitter, receiver, resistor, transistor, breadboard, batteries, and buzzer.

2. Prathmesh Shinde T4059
Aditya Choudhary T4056
Under the guidance of : Ass. Prof. V.H. Patil

3.  Buzzer
 BC547 Transistor
 Resistor 100k ohm
 Breadboard
 Connecting wires
 Battery
 Laser
 Light Dependent resistor(LDR)

4.  LASER BASED SECURITY ALARM's design
provides inexpensive yet effective form of
protection against intruders as well as it can be
easily used to secure the building e.g banks. As it is
highly sensitive due to the light activated alarm
circuit. LASER-Ray goes through long distance
without scattering effect and the Ray is almost
invisible. Only the radiation point and incident
point is visible. So by this security project we can
make an invisible boundary of a sensitive area.
There is two part of the system.
 One is transmitter
 other is receiver.

5.  These devices are output transducers
converting electrical energy to sound. They
contain an internal oscillator to produce the
sound which is set at about 400Hz. Buzzers
have a voltage rating but it is only approximate,
for example 6V and 12V buzzers can be used
with a 9V supply. Their typical current is about
25mA.

6.  Light amplification by stimulated
emission of radiation
 optical disk drives, laser printers, laser
surgery etc.
 Wide range of applications in defence
and medical field.
 Indoor and outdoor security systems.

8.  You've probably seen an old Western movie where the good
guys settle down and run a string at ankle height around
their camp, tying it to a can filled with rocks. When the bad
guys try to sneak up in the middle of the night, they kick the
wire and pull the can over, making a rattle that awakens the
sleeping good guys, who win the day. A laser security
system works along the same principle. Instead of a string,
there's a beam of light surrounding the area, and instead of
a can of rocks, there's an alarm of one sort or another.

9.  Easy in construction
 Consume less power
 Economical and light in weight
 Motion sensors can be added to improve
security
 Theives and burglars can be caught easily

10.  Home security
 Office and corporate security
 Protection from burglars
 Protection from thieves in shops, banks,
houses etc.