HC-SR501 PIR Motion Sensors Online - Robomart (1)

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HC-SR501 PIR Motion Sensors Online - Robomart (1)

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This is a Pyrolectric sensor(PIR) module which produced for human body detection.Its is additionally called Motion Sensor.A PIR detector joined with a Fresnel lens are mounted on a conservative size PCB together with a simple IC , and constrained segments to shape the module. It recognize the movement by identifying the adjustments in the IR levels radiated from the item. – PowerPoint PPT presentation

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Title: HC-SR501 PIR Motion Sensors Online - Robomart (1)


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  • Pir Motion Detection Sensor
  • By
  • ROBOMART.com

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PIR Motion Sensor
  • In order for a PIR sensor to work all of the
    time, they are designed some certain limitations.
    A PIR sensor cannot detect a stationary or very
    slowly moving body - if the sensor was set to the
    required sensitivity, it would be activated by
    the cooling of a nearby wall in the evening, or
    by very small animals. Similarly, if someone
    walks straight towards a PIR sensor, it will not
    detect them until they are very close by. PIR
    sensors are temperature sensitive - they work
    optimally at ambient air temperatures of around
    15-20 degrees Celsius. If the temperature is over
    30 degrees, the field of view narrows and the
    sensor will be less sensitive. Alternatively, if
    the temperature is below 15 degrees, the field of
    view widens and smaller or more distant objects
    will activate the sensor

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OCCUPANCY SENSORS / ENERGY SAVING SENSORS
  • When occupancy in a given space is
    predictable, switching can often be scheduled
    using simple devices such as time-clocks and
    timer-switches to save energy. When occupancy is
    not predictable, then switching can be automated
    using occupancy sensors.
  • Occupancy sensors detect when a space is
    occupied or unoccupied and turn the lights on or
    off automatically after a short period of time to
    save energy.
  • Energy Savings Depending on the
    characteristics of the space to be controlled,
    energy savings as high as 90 can be realized
    through use of occupancy sensors.

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