PIR Sensor based Security Alarm

This electronic security system can be used in banks and other high security areas. In this security alarm system passive infrared sensor is used instead of transmitter or receiver. The main principle of the circuit is to provide security. This is based on PIR sensor with an IC that produces siren. The PIR sensor detects the IR radiations emitted from the humans and it produces a digital output. This digital output is applied to the IC. Thus it produces the sound when any human is detected.

Applications of PIR Sensor Based Security Alarm System:
  • This can be used in the museums to protect the valuable things.
  • This can also be used as an automatic door bell circuit that rings the bell when human is detected.
  • This can be used in defense applications to detect the humans in war field.

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