This sensor uses an infrared emitted diode combined with an infrared phototransistor to detect the reflected infrared signal. Ideal for sensing black-to-white transitions or can be used to detect nearby objects (.5-1cm).
**Documents****:**
* [Datasheet](http://www.sparkfun.com/datasheets/BOT/QRD1114.pdf)
* [Hookup Guide](https://learn.sparkfun.com/tutorials/qrd1114-optical-detector-hookup-guide)
* [Bildr Tutorial](http://bildr.org/2011/03/various-proximity-sensors-arduino/)
**Videos**
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