Question

what is sensor. how many types of sensor
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Answer 1

Answer:

there are some type of sensor

Answer 2

Answer:

There are two types of Infrared or IR Sensors: Transmissive Type and Reflective Type. In Transmissive Type IR Sensor, the IR Transmitter (usually an IR LED) and the IR Detector (usually a Photo Diode) are positioned facing each other so that when an object passes between them, the sensor detects the object.

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