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Line following Robot

Guest ashesv1

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Guest ashesv1

We are building a line following robot. We need the robot to follow blue line with white background and blue line with black background. We made it by using LED and LDR to detect the light reflected from the sensors. The robot follows the blue line on white background using blue LED but and on the black background we are using blue and red LED to to detect the blue line but this doesn't work with white background with blue line. Is there way to use LED and LDR so that robot follows the line. We are going to race this robot against other robots so we don't want to use switch to turn off the red LED to make the robot work with white background.

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