It's Here! Chris Odom's Physical Computing & Robotics with the Arduino IDE - Volume One

Line Sensors by Patton Robotics

$2.00

I've tried to find a perfect affordable line sensor...but I just can't. So I whipped up this kit! With two IR emiters and one detector this guy works really well. The jumper even allows you to disable the IR emitters so you can use it as direct IR detector. Handy for finding flames.

Assembly Instruction Video: