[SOLVED] 2 questions for lfr (line following robot) and sensors

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mohammadhashirbinkhalid

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can anybody tell me from which sensor i can sense a black line on a blue or red background?
i want to make a robot based on avr which can sense black line on blue or red background...
secondly, which type of robot is better? 3 wheeler(2 wheel one caster), 4 wheeler(all 4 wheels no caster) or more than 4 wheels?



this is the track which i want to follow

please tell me about the most appropriate sensor

video is on the following link

https://www.facebook.com/photo.php?v=300757146752668
 

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