A motion sensor is a device designed to detect movement in the coverage area of a device. As the main device, it uses a pyroelectric sensor. The principle of its operation is based on increasing the voltage at the output of the sensor while increasing the level of infrared radiation. That is, with a local temperature increase, 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 the hallways with lighting lamps in order to save electricity at a time when no one is on the landing. In addition, such sensors are used for alarm devices. They are placed around the perimeter of the guarded premises, and they send a signal to the desk of the person on duty if they notice any movement. According to the same principle, a camera with a motion sensor works , which turns on at the moment when a living object is in the zone of its attention.
However, such a sensor does not guarantee operation in 100% of cases. So, if a person in thick clothes passes by the sensor in winter, the device may not be activated. This is 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 the purchase, you will be able to independently connect the motion sensor, following the instructions attached to it. You can configure various parameters by setting it. But in the store, choosing any kind of motion sensor, pay attention to its main characteristics.
Photosensitivity - this characteristic is possessed by sensors that do not work in conditions when there is enough lighting and without additional illumination. If you, for example, set the photosensitivity switch to the standstill position, the motion sensor will only activate the light at night. If you put the regulator in the maximum position provided by the design, the sensor will operate at any time of the day.
It is also important that the sensor has a significant field of view. Usually 15 meters is enough, but there are models with a greater detection distance.
The response speed is also an important feature 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 an object moves slowly, it will merge with the background, and the sensor will also not be able to detect it. Therefore, you need to choose a middle ground so that the sensor detects not only slowly but also fast moving objects.
Now consider the form factors of the sensors. Mostly on the market are sensors that are attached to the wall, so their viewing angle is a number from 120 to 180 degrees. There are also models that provide 360-degree observation. Usually they are mounted on the ceiling of the room entrusted to them.
Now choosing a motion sensor is not difficult for you, it is enough to proceed from the purpose for which you choose it, and you will not be mistaken.