Lesson 18 Line Finder
Introduction
The Line Finder Module applies the principle that infrared rays reflect differently on
surfaces of different colors. After electrified, the infrared diode on the module sends out
infrared rays constantly. When they encounter a white surface, the diffused reflection
happens and the reflected rays are received by the receiver on the module. On the other
hand, when they come across a black one, the receiver cannot get any infrared.
Thus, the processor can tell whether it is a white or black detected surface by receiving
the reflected infrared rays or not. Based on this, the module is usually used in line finding
on a smart car.
Components
- 1 * Raspberry Pi
- 1 * GPIO Extension Board
- 1 * 40-Pin GPIO Cable
- 1 * Breadboard
- 1 * Line Finder Module
- 1 * 3-Pin Wires
Experimental Principle
The Fritzing image:
The Physical picture:
Pin definition:
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