laser security system

A simple and cheap Laser Based Security System, which costs below Rs. 100. It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered when the Laser beam falls on the LDR interrupts, which sounds the buzzer connected to it. This can be used to protect your valuable items, money, room etc. By using different mirror

arrangements you can formdifferentsecurity systems. This can also be used to protect more than one objects by suitably arranging mirrors. One possible arrangement is shown below. In this arrangement Mirrors B, C, D are arranged such that the reflected beam is making 90 ° to incident beam and the Mirror A is placed such that the beam form Laser falls on the Mirror B and the beam from Mirror D falls on the LDR.

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