Accurate return / The library shelves

In the library, when you finish reading a book to put back to its original place, because the book shelf is too much, you might find it hard to accurately find the original position. The library shelves can help you quickly find books in the original position. Inspired by the supermarket scanning guns. Because every book has a different barcode. When you return the book, you just need to at the side of the bookshelf of bar code scanning books， the book is the original place there will be light, give you a hint.Improving the efficiency of the library convenient and the management of the books in the library.