سلام به شما دوستای گل و ممنون از ساینس ادیکت.بله اون یکی از روش هاش هست اما ظاهرا 4 روش وجود داره:There are four types of sensors used in motion sensor spectrum:
Passive infrared (PIR)Passive infrared sensors detect a person's body heat as it changes against the background of the room. No energy is emitted from the sensor, thus the name "passive infrared" (PIR).UltrasonicSends out pulses of ultrasonic waves (acoustic sound waves above the frequency that a human can hear) and measures the reflection off a moving object. Motion causes the frequency of the reflected wave to change (Doppler effect).MicrowaveA microwave sensor sends out electromagnetic pulses and measures the changes in frequency (Doppler) due to reflection off a moving object.Tomographic motion detectorTomographic motion detection systems sense disturbances to radio waves as they pass from node to node of a mesh network. They have the ability to detect over complete areas because they can sense through walls and obstructions. چه مسخرس یه اینتر نمی شه زد