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The guide for beginners about motion sensors

Published : 02/27/2019 10:24:08
Categories : First steps

Motion sensors have gained great prominence in recent years because they help us manage lighting more efficiently than with old keys or switches. This is because the sensors manage the on / off of the light by means of a sensor, detecting people or objects in movement. 

Motion sensor vs proximity detector. Is it the same?

The answer to the question is NO. Proximity detectorare more sensitive than motion sensors because they perform a constant sweep of the area in search of "disturbances", in addition to making a constant measurement of light.

Motion sensors, on the other hand, respond to a "disturbance" when this is of an important magnitude (when there is a significant movement). In addition, they are not able to perform an active measurement of light like motion sensors.

Types of motion sensors

Mainly in the lighting market it is very common to find two types of sensors, these being the following:

  • Passive motion sensors (PIR) are probably the most widely used sensors in the market due to its ease of configuration and use. Its operation is based on the detection of variations of infrared radiation in the environment in which it is placed. The denomination of pasive is because it does not emit radiation, but receives it. They capture presence by detecting the difference between the heat emitted by the human body and the space around it. The detection is carried out by means of a lens in charge of detecting this type of disturbances. Its main component are pyroelectric sensors, designed to detect changes in received infrared radiation, that are themselves encapsulated in a fresnell lens.
  • Active motion sensors by microwave. This type of active motion sensors by microwave base their functioning on microwave emission / reception regardless of the temperature. If something interferes in the waves, the sensor will detect a variation in the return time, causing the lighting to activate. This type of sensors are more sensitive, being able to pass through thin doors and windows. This means that its detection capacity is greater than that of passive motion sensors.
  • Twilight sensors. Base their functioning in the detection of the excess or defect of lighting within the environment in which it is installed (previously we must have tested the sensor to place the regulation at the point where we are interested). In this way we can program the light to turn on when the lighting level is below that indicated to the sensor.

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Motion and lighting sensors 

Currently it is very common to install sensors in corridors, guaranteeing that the light is only on for the necessary time and we do not waste energy or resources. Also, it is very common to see them in toilets, since most people forget to turn off the light once they have finished fulfilling their needs.

This way we make sure that the light is on for the necessary time. The latest trends in lighting bet on the installation of LED strips inside the cabinets so that when they open this light will turn on and help us see better inside the cabinets.

It is also quite common to install LED strips on the bottom of the beds so that when you get up you have a tenuous lighting that helps you without having to turn on the main light source of this room.

 Advantages of motion sensors

Regarding the advantages of the use of motion sensors, we can highlight the following:

Energy savings: By managing the lighting autonomously, the energy expenditure on lighting will be lower, so our electricity bill will also be less. In addition, with this type of sensors we can forget completely to turn off the light and the small oversights that we have every day. And if we combine it with LED type lighting, the savings will be much more considerable.

They can be used as an alarm sensor because if we have sensors installed on the perimeter of our home and the light is turned on, there is the possibility that there is an intruder. In addition, the lighting serves as a deterrent.

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