Line following is an important application in robotics. It is being used in AGV (Automated Guided Vehicle) and allow robots to navigate and perform tasks. There are many type of line sensing method, if you use normal Infrared trasnmitter and receiver, it will be very troublesome to calibrate, right? Well, this very simple to calibrate line sensor might help you.

This Auto-calibrating line sensor is super easy to use. Comes with 5 pairs of IR transmitter and receiver. It can easily covers and detects line width of 1cm to 3cm, dark color or bright color. After power up, 1 press to the push button (at the side), it starts "scanning" the surface under it, calibrating the threshold between dark and bright. It takes just 4 to 5 seconds only. Once calibration is done, these settings are stored in internal non-volatile memory, it will still "recognize" the line even after power recylce (Off and On) again. The outputs are digital (0V or 5V) to indicate line detected or no line, so reading the line position is as simple as reading digital signal.

And for Arduino lovers, you can connect this sensor via Shield-2AMotor or Shield-3AMotor. Check out this video, building a line following robot:
 
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Part 2 - Tutorial of Line Following Robot