I am trying to determine the best way to go about monitoring the opened/closed status of a physical book.
The book is affixed to a platform and only the left side of the book can be opened/closed. The right side of the book is affixed.
Things I have considered:
*Hall sensor placed on the platform with magnet glued into the cover of the book so that when the book is opened, the front cover magnet touches the sensor. This is probably the best solution so far, but it doesn't really report when the book is "opened". It only report when the front cover is touching the platform and the book is completely opened.
*Photosensor placed in the same position so that the front cover blocks out light when it casts a shadow over the sensor. This would work, and trigger the "open" status quicker than the hall sensor, but there are other elements in my project that interfere with this sensor (its a long story).
*Hall sensor/magnet placed on the interior pages. Perhaps I could hollow out a few pages to hide these objects inside, but it would interfere with the reading of the book or make certain pages unreadable. The sensor needs to be as invisible as possible.
I think thats all I have thought of right now. Thanks in advance for all your brilliant ideas!