Object distance sensor?

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hi, i'm looking make project involve detecting object, , knowing distance between object , detector.  distance on order of 5-10 cm, , object of variety of objects, perhaps narrow pencil.  there arduino sensors me?  don't need precise distance, need able @ signal , tell if object getting closer or farther away.


just check distance sensors e.g. @ - http://www.sparkfun.com/categories/139 -


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