AN1436: Proximity Sensors
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چکیده
Proximity sensing based upon infrared signal detection requires two parts: infrared LED and infrared sensor. The infrared LED emits infrared signal to the sensing object, a portion of that signal bounces back from the surface of sensing object, these reflected infrared signal was then captured by the infrared sensor. The intensity of captured infrared signal changes accordingly when an sensing object is getting closer or moving, the captured infrared signal is processed in real time through light to digital conversion to reveal the distance or even the motion of sensing object.
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