Thursday, February 28, 2008

Electronic Book Combination Lock

I'm sure you have all heard of the trick in movies, where someone goes into a hidden room , which can only be opened by pulling out the correct book from a bookshelf.

I decided to change this movie cliche a bit. I took a sharp IR sensor and mounted on a bookshelf. It measured the distance to any book that was pulled out, and checked to see if that was the "key" book. After getting it to work with one book pulled out. I made it a combination of books. It has to be 7-9-5 in that order, any other books are ignored. It resets after 15 seconds.

Pay attention to the characters on the LCD screen in the video!


Mike Shimniok said...

Cool idea!

Dakta said...


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