U5-1.2 Let’s explore Edison’s light sensors

Edison robots have different sensors that can detect different things. One type of sensor Edison has is the light sensors.

Task 1: Meet Edison’s light sensors

Right light sensor

Left light sensor

Line tracking light sensor

Edison’s light sensors are the sensors that let Edison detect and measure visible light. Edison’s main light sensors are on the top of the robot, one on the right and one on the left of the robot. Edison also has a third light sensor, which is underneath the robot and works as part of the line tracking sensor. Look at your Edison robot. Do you see the different light sensors?

The light sensors measure any visible light detected and store the value as a light reading. Like all sensor data, Edison stores this value as a number. The expression in this program tells Edison to compare the value of the light reading from the line tracking sensor to the number 100.

Why 100? Remember that the more light that is detected, the higher the light reading. Edison’s light sensors can give light readings with values ranging from 0 to just over 1000. That makes 100 a good starting point to test with this program.