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A BytBots Microwave/Radar 360 Degree PIR Motion Sensor, Occupancy Body Motion Detector (White) is a type of electronic device that detects infrared radiation emitted by objects within its field of view. PIR sensors are commonly used for motion detection in security systems, lighting control, and various other applications. They are known as "passive" sensors because they do not emit any energy themselves but instead detect the infrared radiation emitted by objects in their surroundings. Key Features of PIR Motion Sensors: Infrared Detection: PIR sensors detect infrared radiation emitted by warm objects, such as humans or animals. The sensor is sensitive to changes in temperature caused by movement. Passive Operation: PIR sensors are passive devices, meaning they don't emit any energy. They only sense infrared radiation emitted by objects in their field of view. Field of View: PIR sensors have a specific field of view or coverage area, and their detection range can be adjusted or customized based on the sensor's design. Sensitivity Adjustment: Many PIR sensors allow users to adjust sensitivity levels. This adjustment determines how much change in infrared radiation is required to trigger the sensor. Pyroelectric Material: PIR sensors often use pyroelectric materials, which generate an electric charge when exposed to a change in temperature. This charge is used to detect motion. Two or Three Sensor Design: PIR sensors may have two or three sensing elements arranged to detect motion in different directions. This helps enhance their accuracy and reliability. Time Delay Setting: PIR sensors typically include a time delay setting, allowing users to specify how long the connected device (e.g., light, alarm) remains activated after motion is detected. Light Sensing (Optional): Some PIR sensors include a light sensor to determine whether it's dark or light. This feature can be used to activate connected devices only when ambient light is below a certain level. Applications: PIR sensors are widely used in security systems, automatic lighting control, smart home devices, and energy-saving applications. How PIR Motion Sensors Work: Pyroelectric Material: PIR sensors contain a pyroelectric material, which generates an electric charge when it experiences a change in temperature. Infrared Radiation Detection: When a warm object, such as a person or animal, moves within the field of view of the sensor, the infrared radiation emitted by the object is detected by the pyroelectric material. Electric Charge Generation: The change in temperature causes the pyroelectric material to generate an electric charge, creating a voltage potential. Signal Processing: The generated electric charge is processed by the sensor's electronics, and if the change in infrared radiation corresponds to a significant motion event, the sensor triggers an output signal. Output Activation: The output signal from the PIR sensor is used to activate or trigger connected devices, such as turning on lights, sounding alarms, or initiating other actions in a security or automation system. Time Delay: PIR sensors often include a time delay setting, allowing users to specify how long the connected devices should remain active after motion is detected. PIR motion sensors are commonly used in a variety of applications where detecting the movement of people or objects is necessary. They are widely employed for security purposes in both residential and commercial settings, as well as in energy-saving systems to control lighting and heating based on occupancy.

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