Reflective optical sensor with transistor output.
Too often we find ourselves trying to find a line. Such is the way of having a robotics company that builds line-following robots among other things. These sensors are really convenient in that they're ready to go, presoldered to a nice 3-pin header.
The 17092 is a reflective sensor that also includes an iR emitter and phototransistor in a package which has the added advantage of blocking visible light. This small package is a great addition to line followers, or edge detecting applications. This product is famous for its uses in coin acceptors, and many other higher speed applications. This unit comes with a cable attached for quick assembly. 3-1/4" long cable, and connects to standard 3 pin header.
Note: There is no current-limiting resistor on the power lead that attaches to the IR LED. At 5V, use a 82ohm 1/2W resistor for maximum power. 220ohms 1/4W works great for a more typical 20mA emitter current.