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What is the colour of the light that the line tracking sensor emits?
When red light falls onto a white surface, it is reflected back to the robot.
When it falls onto a black surface, it is not reflected back to the robot.
This way the robot “knows” if it is over a white or black coloured surface.
The robot did not stop at:
Why didn’t the robot stopped at the red line?
Which colour do you think is best to get Edison to stop?