motion detection

What is Motion Detection?

Motion can be detected by measuring change in speed or vector of an object or objects in the field of view. This can be achieved either by mechanical devices that physically interact with the field or by electronic devices that quantify and measure changes in the given environment.

How Its Works?

Motion can be detected by: sound (acoustic sensors), opacity (optical and infrared sensors and video image processors), geomagnetism (magnetic sensors, magnetometers), reflection of transmitted energy (infrared laser radar, ultrasonic sensors, and microwave radar sensors), electromagnetic induction (inductive-loop detectors), and vibration (triboelectric, seismic, and inertia-switch sensors). Acoustic sensors are based on: electret effect, inductive coupling, capacitive coupling, triboelectric effect, piezoelectric effect, and fiber optic transmission. Radar intrusion sensors have the lowest rate of false alarms.

Probably the best radar intrusion sensor is a pair of leaky coaxial lines hidden (buried) in the soil. A chirp frequency modulation provides a continuous target response having a baseband frequency that is proportional to the distance along the length of the cables.

What is Our Main Idea?

Our main idea according this motion detection is by using the Light motion sensor. By using this,we will put a sensor on the stair and the light that on the stairs will be off to make the place dark.