Many teams still use the Banner sensors that were included in the KoP in the past. However these sensors cost $50+ a piece.
I have been searching for a suitable replacement. The best option I have found so far seems to be this.
http://www.alliedelec.com/search/pro...x?SKU=70048630
However these run on 12v which make them slightly harder to wire than a 5v sensor. The B version is 5v but I haven't found a source that keeps that part number in stock.
Does anyone know of or used a good reflective sensor that can replace the banner sensor?
Remember everyone, during build season, if you mess something up.....
In the words of Adam Savage... Failure is always an option!
(and so is blowing stuff up) - J.Warsoff [more] 
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