A siren is a loud noise-making device mounted in fixed locations and used to warn of natural disasters or attacks or emergency service vehicles such as ambulances, police cars, and fire trucks. There are two general types: pneumatic and electronic. Some time before 1799, the siren was invented by the Scottish natural philosopher John Robison. Robison’s sirens were used as musical instruments; specifically, they powered some of the pipes in an organ. Robison’s siren consisted of a stopcock that opened and closed a pneumatic tube. The stopcock was apparently driven by the rotation of a wheel.

In 1819, an improved siren was developed and named by Baron Charles Cagniard de la Tour De la Tour’s siren consisted of two perforated disks that were mounted coaxially at the outlet of a pneumatic tube. One disk was stationary, while the other disk rotated. The rotating disk periodically interrupted the flow of air through the fixed disk, producing a tone. De la Tour’s siren could produce sound under water, suggesting a link with the sirens of Greek mythology; hence the name he gave to the instrument.

In our software we use also from a warning method:

Once the Model is trained, you can define your devices. In this section you will be able to define the “Alarm Threshold” of warning announcement by the system, in addition to intervals too. In our model we chose 40 with an interval of 30 minutes for example. In the last box, you define the person who should be warned via their email definition. Each device will be defined for Our Server by a Device Key which is generated automatically.