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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