IR Reflectance Sensor - QRE1113
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The QRE1113 is a small IR reflectance sensor. This sensor is often used in line following robots because, if it can sense if a surface is white or black.
There are four pins on the QRE1113 - two control the IR emitting LED while the other two are the collector and emitter of a phototransistor. The IR diode has a max forward current of 50mA and operates at 940nm.
Breakout boards with [analog](http://www.sparkfun.com/commerce/product_info.php?products_id=9453) and [digital](http://www.sparkfun.com/commerce/product_info.php?products_id=9454) outputs are also available.
**Documents**:
* [Datasheet](http://www.sparkfun.com/datasheets/Components/SMD/QRE1113.GR.pdf)
**Features:**
* Phototransistor output
* No contact surface sensing
* Miniature package
* SMT gull wing leads