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Other designs also feature a built-in passive infrared sensor to detect motion, and only switch on when somebody is passing by in the dark. With the availability of low-cost LEDs , many different variants have become available, featuring different colours, sometimes changing automatically or in a user-controllable way.
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Responsivity: The output current divided by total light power falling upon the photodetector. Noise-equivalent power: The amount of light power needed to generate a signal comparable in size to the noise of the device. Detectivity: The square root of the detector area divided by the noise equivalent power.
At one point, we walked into a toy store where every motion-activated decoration went into full scary mode: screaming ghosts, a werewolf with flashing lights, a giant spider crawling across the floor.
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