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The design and arrangement of the lenses ultimately determine the sensor’s range and sensitivity. Some PIR sensors come equipped with potentiometers, allowing users to adjust settings for the duration of light activation after a motion signal and the distance sensitivity. Smaller lenses, when utilized, require closer proximity for activation, while larger lenses allow detection over a broader area.
Furthermore, some sensors are tailored to ignore the presence of smaller animals, such as pets. This is accomplished by designing the lens elements small enough that smaller movements do not generate sufficient heat on the crystals to trigger activation, thus focusing on larger entities moving within its field of view.