I look for a solution for a problem in my project.
The idea of the project is to create a smart library which help us to know where every book located in every period of time.
The idea is to make a scanner which pass over the shelf and scans the books every 30 minutes.
I thought to implement that project with NFC tags and NFC scanner, but I found that there are limitations of distance between one tag to another.
Another problem is that I want to read radius of tags and not tag after tag (like QR code for example) because I don't know in which position the book will be on the shelf.
Picture of the problem:
The questions are
1. If the limit of NFC tags distance is more or fewer millimeters
2. If there is another cheap solution for reading some objects which are located in distance of 5-10 centimeter from some scanner