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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.
In response to the shortcomings of human guards to watch surveillance monitors long-term, the first solution was to add motion detectors to cameras. It was reasoned that an intruder's or perpetrator's motion would send an alert to the remote monitoring officer obviating the need for constant human vigilance.
A type of motion sensor was used by the Japanese since ancient times. In the past, "(m)any people in Japan kept singing crickets and used them like watch dogs." [7] Although a dog would bark when it senses an intruder, a cricket stops singing when approached by an intruder. The crickets are kept in decorative cages resembling bird cages, and ...
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.
Many homeowners choose to install CCTV systems either inside or outside their own homes, sometimes both. Modern CCTV systems can be monitored through mobile phone apps with internet coverage. Some systems also provide motion detection, so when movement is detected, an alert can be sent to a phone. [67] Digital video recorder for public transport
The system consisted of Nest Guard (an alarm, keypad, and motion sensor with embedded microphone), Nest Detect (a door/window and motion sensor), and Nest Tag (a key chain fob). [78] The product was released in November 2017.
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