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when was it created
The motion sensor was created in the 1950 by Samuel Bagno His device made use of ultrasonic frequencies as well as the Doppler Effect. -
how a motion sensors detected motion
Active motion sensors (also called radar-based motion detectors) send out ultrasonic sound waves – the same waves used in pregnancy ultrasounds – and these waves reflect back to the sensor. This pattern continues until it’s disrupted by an interference of some sort (e.g. a person walking past). https://www.cpss.net/about/blog/2013/11/how-does-an-alarm-motion-sensor-work/ -
what its made of
All objects with a temperature above absolute zero emit heat energy in the form of radiation. Usually this radiation isn't visible to the human eye because it radiates at infrared wavelengths, but it can be detected by electronic devices designed for such a purpose. The term passive in this instance refers to the fact that PIR devices do not generate or radiate energy for detection purposes. They work entirely by detecting infrared radiation emitted by or reflected from objects. -
how the motion sensor works
When the motion sensor detects movement it will turn on numerous things, like turning on lights, cameras, the heat, and many other things. -
what is a motion sensor
A wireless motion sensor is going to be able to detect objects that are moving, and then tell the device to take some type of action. Most of the time, one would use the motion sensors in order to detect people, such as in a home security system. However, hunters and field researchers utilize game cameras that have wireless motion sensors as well.
