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How to detect blue line

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Welcome, ashes!

We need more information from you. Why do you have to detect the blue line?
 
Basically, I am building line following robot. A track has blue line to follow. With one side of the track being white and the other side of the track being black. I am stuck how to detect the blue light from the black background.

Thanks for the reply
 
Basically, I am building line following robot. A track has blue line to follow. With one side of the track being white and the other side of the track being black. I am stuck how to detect the blue light from the black background.

Thanks for the reply
Just noticed you have also posted this question in "Homework" forum.

Please pick one or the other, not both.
 
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