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ugg I just realized.. its digital! *facepalm* Duh! digital-not good for detecting distances, which are needed for following a wall. whell, I guess I'll just have to spend the extra $5 and get this one http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2046-NDwhich I believe is like this onehttp://www.sparkfun.com/commerce/product_info.php?products_id=242