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I am starting a project for book management in a library. The primary concern is I need to verify which book is being taken out and raise an alarm if the book being taken out is not issued. So I am planning to use some form of RFID (or NFC) tags for this. I have noticed that some of them come in the form of stickers that I can easily put on the back of each book.
I am planning to use an RFID reader with an arduino uno to properly detect the tags as the first step. I will be adding the alarm part later on.
I have some experience with mfrc522 rfid reader but its read range is very less (almost contact). But I want the tags to be scanned as people walk out through the door of the library with their books. The door of the library is some 1-1.5 meters wide.
Can someone please help me in selecting the appropriate rfid reader and corresponding tags?
Thanks
Thanks for help @TomGeorge
I have already tried this. What I'm getting mainly is how can we issue and return books using rfid. That's not my main problem. I can do that since I have already worked with mfrc522. They are low range (almost contact) rfid's. I am looking for long range rfid because my main concern is
and
So I wanted help in selecting the rfid reader and tags that i should use for this application.
I have some medium level experience as I've been working on some arduino and related projects for quite some time now. I have even used mfrc522 in one of my earlier projects.
Thanks
Well, the system in our local libraries just seem to have the standard tag labels in the books which are read at short range by the issuing terminals. There the sending antenna is quite a small coil, but a larger coil, possibly driven with more power, should have longer range. The ones at the egress are about 1m wide, 1.8m high, there are at least two mounted parallel about 1.5m apart, either side of the pathway to the door. I assume that they work as "Helmholtz Coils" to create a fairly uniform magnetic field in the space between them to excite the tags. I can't see any obvious reason why the same book tag should not work both at short and long range, given a much bigger antenna for the latter. This must surely be a well documented technology?
Jeevan -
you are looking for something that in the near field HF world, would be possible with passive LF and HF RFID tags and higher power readers and larger antennas.
Passive UHF utilizing the near field has very short range (almost touch - and is not widely available in the market) we experiemented with these several years ago - the frequency band really prohibits flexibility for using the near field.
anyway - if you want this range, you have three choices.using passive LF or HF (in the near field) or using passive UHF in the far field.
the questions you need to ask of your proposed application to decide which technology to use are: how big can reader antenna be? how much current will your power source be able to have for the reader? how big can your tags be? what are the costs you are thinking about for tags, reader, reader antenna? what is the environment (outside, inside, metal in the field, unknown materials in the field, people in the field, etc.)?
just to get started.
For more information, please visit UHF Rfid Reader Modules.
Good day,
Thank you for the quick response. I am also a part of the team working on this project with Jeevan.
The reason we decided to go with UHF rather than HF is because of the size constraints. The reader cannot be larger than 3.08cm x 2.06cm x 0.5cm, while the tags must not be larger than 2cm x 2cm x 0.5cm. Using UHF in the near field region is not feasible, as you stated, so we are considering far field communication.
To answer the other questions posed, the system also needs to operate both indoors and outdoor around metal surfaces. While we aware that metal surfaces affect the quality of UHF signals to a greater degree than HF, we have seen solutions where people are able to deal with this problem. For one of the batteries being considered, the current supply would be 15mA pulsed or 0.2mA continuous (as specified in the datasheet).
As for price, Jeevan would have to get back to you on that.
-Sarika
ok - i think you most likely have described a system which includes a module for the reader - if you want to use TI based solution for that - please see: https://tsscompany.eu/murm-evaluation-board/
is this battery powered UHF reader? Did i understand that correctly? (You many want to rethink your frequency band choice then and have another look at HF, using the TRF79xxA reader + MSP430...we have app note for ULP operations, but seems as though you have made up your mind, and maybe you need more range, but maybe you don't get much more with a UHF reader and tag that small anyway)
for the tag, you will have to get those from any of the multitude of vendors found via search engine
The reader we are required to developed needs to be battery powered as it is to be carried by a user. I will check out the link that you have recommended. Thank you for your suggestion.
The reason that we eliminated HF as an option was due to the size of the tags required to obtain the necessary 1.5m to 2m range. Was that a misunderstanding on our part? Can the tag antenna size meet the size specified in my previous post for this range?
you will have trouble meeting the distance requirement because of the dimension constraints you have placed on both sides (reader and tag), no matter the RFID frequency, plus UHF reader board that small will still need antenna...remember that in 900MHz band, one wavelength is about 1 foot.. this means a 1/4 dipole antenna would be about 3 inches...here is a chip antenna though,
http://www.pulseelectronics.com/download//wpdf/pdf
but it is still 10mm long...and you still need clearance under it + your reader IC + MCU (could be CC430 or CC11xx or CC12xx + MSP430)
for the tag - you will have a challenge there...take a look at ALN-...or get some and test them out - these are about the size you want to use.
http://www.alientechnology.com/wp-content/uploads/Tag%20Family%20Overview%20(-11-06).pdf
you could also look at BLE...it will require a battery on the tag side, but you may be able to get the reader size down to what you are proposing and the distance you are looking for...not exactly RFID, but you could get about the same user experience and the battery on the reader side will last longer.
maybe this is just another option for you.
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