It is an electronic sensor that measures infrared ir light radiating from objects in its field of view.
Motion sensor gate light.
Plus it s marketed as easy to install by diyers.
It is a low cost device used to detect a change in motion in its surroundings within.
When any person animal or any object comes in the range of the sensor.
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In this circuit pir passive infrared motion sensor is used which is used as a motion detector.
The circuit will automatically switch on the lamps lights of your main entrance gate at night only.
Ideally suited as outdoor motion sensor lights as well as indoor lights they are a great way of preventing break ins or helping to light the path.
The light is powered by bright leds that will last for years and save energy and the motion detector can sense motion up to 70 feet away making it ideal for those with larger yards.
This can also used in automatic room light when any person enter in the room then light automatic turn on.
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With their impressive detection range and wide viewing angle any movement or activity occurring near your home can easily be detected and this can also trigger the indoor lights to come on making break ins less likely.
Then automatic light switched on.
Here is a very interesting and useful project of a motion sensing main entrance gate night light circuit.