The line follower sensor from Robotbase is a complete line follower sensor solution. The board comes equiped with an IR light emitter and IR detector in a single package. The line follower detects if the IR is being reflected from the surface under test. The optimum detection distance is about .25" to .5". The product comes with a convenient indicator LED to immediately show the status of detection.
The Line Tracking Sensor is a product specifically designed for robots. Using photoelectric sensors, this product helps robots track a black line on white paper, or a white line on black paper.