How to Build a Circuit to Detect a Black Line?

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To build a circuit that detects a black line, consider using optical sensors like photodiodes or phototransistors. The effectiveness of the circuit depends on specific factors such as the line's thickness, length, background contrast, and the intended application. Providing detailed information about these variables will help others offer more tailored advice. Engaging in discussions about similar projects can also yield useful insights. Clarifying these aspects is crucial for developing an effective line detection circuit.
rusty009
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Hey, I need to build a circuit that needs to detect a black line. And I need some help, if someone could please tell me what components I should look into rather than already designed circuits that would be a huge help ! Thanks in advance.
 
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I think people would get a better response if they explained a bit more.

Black line where? How thick? How long? Against what backgound? Straight? For exactly what purpose?
 

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