LED T8 Sensor Discription
|LED T8 Sensor Series
|-----A motion detector is a device that detects moving objects, particularly people. A motion detector is often integrated as a component of a system that automatically performs a task of alerts a user of motion in an area. Motion detectors form a vital component of security, automated lighting control, home control, energy efficiency, and other useful system. (#wikipedia)
|PIR Sensor (Passive infrared sensor)
|-----Passive infrared sensors are sensitive to a person's skin temperature through emitted black body radiation at mid-infrared wavelengths, in contrast to background objects at room temperature. No energy is emitted from the sensor, thus the name "passive infrared" (PIR). This distinguishes it from the electric eye for instance (not usually considered an "motion detector"), in which the crossing of a person or vehicle interrupts a visible or infrered beam.
|-----These detect motion through the principle of Doppler radar, and are similar to a radar speed gun. a continuous wave of microwave radiation is emitted, and phase shifts in the reflected microwaves due to motion of an object toward (or away from) the receiver result in a heterodyne signal at low audio frequencies.
|-----Voice Sensors are sensitive to DB (Decibel). Sensitive DB is 46DB.