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If one half sees more or less IR radiation than the other
It is consists of piezoelectric element
the last data present on A to D are stored in the latches and the segment outputs remain stable
or "IR motion" sensors
Infrared Object Detection Sensor 125khz If one half sees moreIntroduction: This Infrared obstacle object detection sensor is super easy to use. It comes with on board potentiometer to adjust the sensitivity. The output is digital signal so it is easy to interface with any microcontroller such as Arduino Uno,Mega, Leonardo, Zero, 101, even the Raspberry Pi or Raspberry Pi Zero. And of course it is also compatible with all other controller boards . This Infrared sensor offers simple, user and fast obstacle