Getting Started Guide

SCRATCH CODING KIT
Sensor introduction
light emitting part
light receiving part
The infrared sensor consists of two parts: a light emitting part and a light receiving part.
Infrared sensors detect objects by illuminating invisible infrared rays. It consists of a light emitting part that
illuminates infrared rays and a light receiving part that detects reflected light. The amount of light reflected is
different for each object. If an object reflects a lot of light, the light-receiving part will detect it as a bright object.
An object with a white color reflects a lot of light again.
The receiver recognizes a lot of light and judges that this
object reflects a lot of light.
Dark objects rarely reflect light. The receiver recognizes
that there is little light, and judges that this object is dark.
What is an infrared(IR)sensor?
If the object is dark, the light will be absorbed by the object and the light-sensing part will perceive it as a dark object.