Electronic Book Combination Lock
Submitted by airman00 on February 29, 2008 - 4:03pm.
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.
Watch a quick video of it in action , turn up your speakers to hear the buzzer
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. I
made a video and it is currently processing on YouTube so i'll post it
here , once its done processing( probably when I wake up it will be
Right now the code to activate a buzzer.
Pull book 7 out
push 7 in
pull 9 out
push 9 in
pull out 5
KEY SOLVED- buzzer rings