Design of 8051 Microcontroller Based Security System with a Laser Beam Network

  title={Design of 8051 Microcontroller Based Security System with a Laser Beam Network},
  author={E. Kanniga and Meenakshi Sundararajan},
  journal={Indian journal of science and technology},
This article describes a low cost microcontroller based security system using a laser beam for use in highly restricted office areas, buildings etc. The laser beam from the laser diode is directed to fall on an LDR by reflecting the beam using four mirrors placed at the four corners of the door. As the beam is interrupted by the intruder, a buzzer raised to the circuit goes ON. The system also has a password lock and entering the wrong password too triggers the buzzer to go ON. An 8 bit… Expand
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