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Re: Banner Signal Issue
Based on the datasheet you linked to, this is an NPN (aka sinking) output. You would want to connect the collector to your digitial I/O line so the sensor pulls it down or lets the pullup resistor pull it up.
Yes, there may be some minimum voltage it operates at, and 5V might not work. However, based on your schematic, I think you have it hooked up wrong. Refer to the wiring diagrams on page 5 of the datasheet. You want to apply 12V across blue and brown. Then, using a suitable pullup resistor (the digital sidecar has pullups on its inputs), connect to either black or white. You should see the state of that signal change when you present an object versus when an object is not present.
You can use 5V on the pullup (the open collector output will just pull it down), but you need 12V across blue/brown to give the light and detector circuitry the appropriate supply voltage.
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Last edited by jee7s : 08-02-2012 at 23:33.
Reason: corrected the wire colors for the supply voltage
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Starting projects is fun, easy, and exposes you to new things, but finishing them shows true character. - Greg McKaskle [more] 
08-02-2012, 23:26
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