A proximity sensor is simply a device able to detect the existence of other objects without any direct physical contact being made with it. These devices are very useful and can be used in many applications. They are most commonly used in security and access control systems. They can be installed indoors and other points of entry, and they can also be used to detect whether an object is in actual view of the door, or not. Most proximity sensors are in the form of a magnetic transmitter, which is placed near the object that needs to be sensed.
It should be kept in mind that there are different types of proximity sensors available for use in a variety of situations. Some of these objects include PIR (passive infrared), Iometers (infrared microphones), capacitive actuators, ultrasonic detectors, ultrasonic frequency detectors and even bar sensors. Each of these objects has its own set of advantages and disadvantages. For instance, a PIR is usually considered to be the best option for house-scape and indoor applications due to its range. Iometers on the other hand offer better options for monitoring outdoor areas, and are more sensitive than PIR sensors. Capacitive actuators are generally used for monitoring doors and other points of access, and the last option is the ultrasonic frequency detector, which is capable of detecting objects at distances of up to thirty feet.
All of these objects have their own benefits and drawbacks, and it is therefore up to the user to decide which one would be most appropriate for their application. The overall principle behind proximity sensors is that an object’s movement can be detected at a distance, even when there is no physical contact between the object and the receiver. Thus, they can help make home security a lot easier.https://www.youtube.com/embed/RO1P8jGYU78