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I'm also interested in this TOF Sensor, and trying to figure out the best setup to start doing things with it. Joseph, have you been able to advance on your project? Regards


If you want the book and shelf to look normal, then use tiny magnets in the books and either reed switches or hall magnetic sensors embedded in the bookshelf. You can even discriminate two books by minding the magnet's polarity.


Why not use RFID tags and sensor. You can do an inventory any time you want. The RFID tags are inexpensive and the sensor is not that much and available for the Arduino. Nothing shows if you put the tag in the spine of the book.


As Majenko stated in the comments, an easy and discrete way would be using IR proximity sensors behind each book. The IR light from them is invisible to the eye, they are easy to read with an Arduino and often the casing of the IR LED and IR sensor are black, so that you could easily hide them in a black backplate of your book case. The IR sensor will output ...


I assume all these solutions need to know exactly what book is where (positioned). A solution could be a long LED strip (or other light) above the books, and at the bottom a strip of photo resistors (LDR), placed at every 2 cm. Place this photo resistors far enough backwards to cover the end of the shortest book (unless you do never change the order of the ...

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