How about a switch that goes from the back of the book to the front and
over the front cover?  As pages are turned, the switch momentarily closed
registering a page flip.  Obviously, it would be a little tricky to detect
multiple pages being flipped at once.  Same concept can be applied with an
optocoupler.

-Mario

>
>
>>-----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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