PIR Sensor

Infrared is the invisible radiation lies between the Visible and Microwave portions of the electromagnetic spectrum. The term Infra means below the ability to detect visually and the term Red means colour of the light with low energy level. The Near infrared is close to the red portion of visible light and the Far infrared is close to the microwave region. Far infrared is thermal and we feel it as heat by the temperature sensors in our skin. Short and Near infrared rays cannot be detected since these are invisible as well as cool. Active infrared rays are produced from semiconductor sources but natural objects like animals including human beings emit infrared rays from the body heat. Humans at normal body temperature emits Infrared rays at the wavelength of 10 microns.PIR Sensors are used in surveillance systems to detect moving persons in protected areas.

See more in this link http://www.engineersgarage.com/contribution/pir-sensor

14 thoughts on “PIR Sensor

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    1. Dear Ziddik
      IR rays are light rays similar to visible light, but out spectral response is low to IR rays so the rays appear as invisible.It is better to avoid IR rays falling on the eye but not harmful as Laser.

  5. Dear Dr. Mohankumar,

    First I thank you about writing very interesting articles on electronics. Could you please write an artical on “PIR-based burglar alarm” with simple PIR-based burglar alarm circuit diagram. I think this topic is useful to most readers.

    Ananda Athukorala
    Sri Lanka

    1. Dear Ananda
      Your feedback is inspiring. I am mainly concentrating on electronics and biology articles since the stat of site shows that the rating is high in electronics articles than circuits. There are more than 600-800 visits per day in some articles. Many circuits are available in net but most of them are repetitions using the old fashioned transistor designs. Most of these transistors are now obsolete in this Micro controller world.PIR sensor module is readily available and the only requirement is a driver circuit and alarm generator. I will post a circuit for you soon.

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