A motion sensor with a siren is an alternative to a stationary security system with an alert to the remote control of the quick response service. The operation of the device consists in issuing an audio signal when an attacker enters the protected area and scares him away.
Types and principle of work
There are two types of signaling devices: peripheral and perimetric. The difference between them is the principle of installation in a protected area. The first are mounted on the facades of the building and fences. The alarm is turned on when the intruder enters the coverage area, the diameter of which reaches 10-15 meters, depending on the model. Perimeter motion sensors with a siren are installed around the perimeter of the protected area, blocking the required space.
The principle of operation of the device is simple, as is its design. When moving in the coverage area, the sensor transmits a signal to the microcomputer, processing it and supplying a signal to a siren, a connected flashlight or a video recorder. Depending on the type of sensor, the movement of an object is determined in the infrared, ultrasonic or microwave range. The most popular were wireless motion sensors with a siren, the mounting location of which can be constantly changed, unlike stationary ones operating from a 220-volt network.
Signaling devices
The devices are mounted in smart home systems as a control element of the lighting and alarm systems. It is not necessary to combine them into a single mechanism, the motion sensor with a siren is an autonomous device. It is applicable in the office, production room, on the territory of the company or in a country house, in car parks. Wherever restricted access to the protected area is required, motion sensors are installed.
Pros and Cons of Using
A significant advantage of the use of sound alarms is their autonomy, operation is possible regardless of additional power sources. It is enough to install the device in the right place for further use. The security system based on motion sensors with a siren does not need additional configuration and adjustment, as it is delivered as a ready-made kit. Light and sound add-ons on sensors not only warn the owner of the protected area, but also frighten off the attacker. Additional devices for sound and video recording, forwarding of notification messages can be connected to any signaling device, and the sensitivity of devices can be easily adjusted due to parameters preset by the manufacturer.
A common drawback of such security devices is the need to constantly monitor the status of an autonomous power source, change batteries in time, or charge batteries.
Common models
The security systems market is replete with sensors from different manufacturers and modifications. These are motion sensors with a siren and remotes for remote monitoring, wireless sensors with a small viewing angle for internal use as a signaling device, and so on.
An example is the Sound Alarm Sensor Alarm, which has a detection range of 15 meters, a viewing angle of 110 degrees and a volume of 105 decibels. Sensor Alarm - a wireless system with two remote control panels and a siren, easy to install and configure, with an infrared motion sensor.
An interesting model is the Secure Dog barking dog simulator, which has a range of 8 meters and an angle of coverage of 360 degrees. This model is installed in the apartment when doors and windows become protected areas. If the sensor coverage area is violated, a loud dog barking turns on, scaring the attacker away.
Movement sensors for giving with a siren "Control-Lux", PL20-Kit, which work in any weather, are widely used. These devices combine the sound and light signal to scare off violators of the territory.
Signal Selector
When choosing a security system based on mobile motion sensors, they are guided by the place of their installation (on the street or indoors), the volume of the supplied signal and its type, the possibility of remote control and shutdown. The viewing angle of the detector depends on the specific model and is 30-360 degrees. To protect certain sections of the territory adjacent to the house or the parking lot, low-angle systems are used that have an increased range based on one or more motion sensors. Indoors, you need to use devices with a wide viewing angle and the ability to supply different signals, up to voice messages recorded on the memory card.