OK...here is an interesting challenge a coworker has been discussing...
 
Think of 10 pages in a notebook, like a ring binder.  As each page is turned, how to keep track of what page is facing you.
 
My thought was hall sensors, with magnets on the page over the top of the sensors, so that the micro would read a hex or binary code depending on the pages that were still unturned.. 
 
This is not a one-off project, so needs to be simple to implement, and easy to manufacturer.
 
thoughts?
 

		
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