Building Robots With Lego Mindstorms

Reading Sensors • Chapter 4 67

Reading colors is a very common application for light sensors.We already

explained that the sensor doesn’t actually read colors, rather it reads the reflected

light. For this reason, it’s hard to tell a black brick from a blue one. But, for now,

let’s continue to use the expression reading colors, now that you know what’s really

behind the reading.

Line Following

Probably the most widespread usage of the light sensor is to make the robot read

lines or marks on the floor where it moves.This is a way to provide artificial

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suitable for that particular kind of sensor. For example, readings from

touch sensors become ...