Line Tracking Threshold

When the robot is line tracking, the color sensor detects the amount of reflected light from the surface under it. Dark surfaces absorb light, whereas bright surfaces reflect it.

Physical Robot users

1. 
   Using the EV3's menu, navigate to the Brick App tab and select Port View.
2. 
   Use the port view on the EV3 and observe the value of the Color Sensor when it is set for Reflected Light (COL - REFLECTED).
3. 
   Place the robot so that the color sensor is over the black line and write down the value reported on the EV3's LCD screen.
4. 
   Then, move the robot so that the color sensor is over the white surface and write down the value reported on the EV3's LCD screen.

Virtual Robot users

1. 
   Run the program and use the WASD keyboard keys to move the robot so it is over a black surface.
2. 
   Use the Robot > Debugger Windows > EV3 Remote Screen to see the value reported. Write it down.
3. 
   Use the WASD keyboard keys to move the robot so that it is over the white surface. Write down the value reported on the EV3 Remote Screen.