Starter Guide

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Lesson 24 Line Finder module
Introduction
In this lesson, let’s learn about the line finder module. This module, as its
name suggests, is used on the line finding of cars.
Line Finder Module:
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.
S
Digital output
+
3.3V
-
GND
As can be seen on the picture, the line finder module is divided into anode,
cathode and a signal wire. The signal wire needs to be adjusted by a
potentiometer when it is connected to a digital port.