Motion sensor is a device designed to detect movement in the coverage area of the device. It uses a pyroelectric sensor as the main device. The principle of its operation is based on an increase in the voltage at the output of the sensor with an increase in the level of infrared radiation. That is, with a local increase in temperature, which may indicate the appearance of a person in the room, the sensor activates the equipment connected to it.
Motion sensors are used for different purposes. They, for example, are installed in entrances along with lighting lamps in order to save electricity at a time when there is no one on the landing. In addition, such sensors are used for burglar alarm devices. They are located around the perimeter of the protected premises, and they send a signal to the desk on duty if they notice any movement. A camera with a motion sensor works on the same principle, which will turn on at the moment when a live object is in the zone of its attention.
However, such a sensor does not guaranteetriggered in 100% of cases. So, if a person in thick clothes passes by the sensor in winter, the device may not activate. This happens because the temperature of a person's clothes is approximately equal to the temperature of the environment. There are other ways to avoid triggering the sensor.
After purchase, you can independently connect the motion sensor by following the instructions that came with it. You can customize various settings by installing it. But also in the store, when choosing any motion sensor, pay attention to its main characteristics.
Light sensitivity - this characteristic is possessed by sensors that do not work in conditions where there is enough lighting and without additional illumination. If you, for example, set the light sensitivity switch to 100 lux, the motion sensor will only activate the bulb at night. If you put the regulator in the maximum position provided for by the design, the sensor will work at any time of the day.
It is also important that the sensor has a large field of view. Usually 15 meters is enough, but there are models with a greater detection distance.
Response speed is also an important characteristic that is configured on the sensor. If the object moves too fast, the sensor will not have time to sense its presence. On the contrary, if the object is moving slowly, it will blend into the background and the sensor will not be able to detect it either. Therefore, you need to choose the golden mean so that the sensordetected not only slow, but also fast moving objects.
Now consider sensor form factors. Most of the sensors on the market are wall-mounted, so their viewing angle is between 120 and 180 degrees. There are also models that provide 360-degree surveillance. Usually they are mounted on the ceiling of the premises entrusted to them.
Now it will not be difficult for you to choose a motion sensor, it is enough to proceed from the purpose for which you choose it, and you will not be mistaken.
