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Abdelrahman,The SparkFun line follower array does allow you to program it to follow a white line on a dark surface, and is adjustable - would probably depend though on how light the blue is. Pololu has a number of other line follower array options (both digital and analog), along with Arduino libraries and examples - those might be worth checking into. I used the SparkFun because the location calculations were done on the array, not the Arduino, but you do loose some flexibility that way./K
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