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Micro
Controller based Security System using Sonar |
The
problem facing many institutions like museums and banks is that of security round
the clock. Security guards are expensive and burglars have learned to evade conventional
security devices like infrared beams, thermal sensors etc. The use of SONAR in
a security system, as used in our project, is a novel idea, and as far as we could
determine, extremely difficult, if not impossible, to evade. The infrared beams
have the disadvantages of covering just a limited area in a room
and to cover
a whole room requires many of these beams. This makes this technology very expensive.
It is also by no means foolproof and can be evaded by experts as has been so ably
demonstrated in so many Hollywood films. Temperature sensors can also be evaded
as they can either be made extremely sensitive and risk false tripping of the
alarm due to changes in ambient temperature or made less sensitive at the risk
of allowing evasion. The use of SONAR offers us many advantages. It is nearly
foolproof, albeit it be at the expense of being extremely sensitive to the point
that the only way to avoid tripping of the alarm is to make sure that the room
it is covering is free from any movements. In this project we have designed and
developed a unique security system that utilises the capabilities of microcontroller
and a special purpose SONAR
module. It is also extremely cost-effective when
compared to similar systems currently in use.
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