Doubt reading line with arduino.

[dck]

Hello,
I'm thinking about doing a project using the arduino and a sensor I just don't know what sensor I can use to read the line like this in the links of the videos below.
Link:
Link:


I need a sensor to be connected to the arduino reading the drawing line then the arduino will send the information of the line that was read to one motor on the X axis and another one on the Y axis to follow the line.

Basically it will work like a robo following of line so it must move the axes x and y with smooth movements.

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[109jb]

Just search for "Arduino line following robot" on google. There are about a gazillion pages on them. They each have to have a sensor to track lines just like you are wanting to do.

[dck]

OK,
I already did this research on google. I just wanted to see if anyone has any suggestion of a specific sensor that would work better, because I think infrared or LDR sensor would not work well in curves.