>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 11 October 2005 17:49
>To: Microcontroller discussion list - Public.
>Subject: [OT] sensing a page in a book
>
>
>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?

Are these "paper" pages?  If so would the magnets not be a little heavy?

How about opto-reflective sensors, and notches cut out of the pages?

My 3 month old daughter has a talking book like this, but each plastic page (there are only 4 or so) is connected to a separate pair of "segments" that make up the "spine" of the book.  Simple switches in the spine can tell which page has just turned.

Regards

Mike

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