RFID multiple tags at once with out reming tag

Projects General Guidance
1

Hey Gang,

Thanks for taking the time to read my question.

I was wondering if it is at all possible for an RFID to read an NFC tag, then ignore that tag, while then available for other tags which are placed in sequence.

The project is a board game I am working on. The idea is to trigger a media file when an NFC tag is detected by an RFID reader built into the game board, that tag remains on the gameboard. As new tags are added to the board each would play a separate media file, whilst the previous tags are still present and no longer trigger a reaction from the RFID reader.

Ideally the project would flow like this:

A tag is place on the 'RFID reader/gameboard' which triggers a sound/video clip (from RPi/Arduino?). The tag is not removed from the RFID reader/gameboard. A second/third/fourth...tag is placed on the Reader/gameboard and each different tag causes a different media file to play. Once a tag has generated its corresponding media file to play its signal would be 'ignored', while the RFID reader waits for next tag.

In summary can an RFID reader ignore a tag once detected, not react to it again while it is still within its 'field', but also be available for reading a new tag?

Thank you for your consideration

  • James
2

James, welcome to the Arduino forum. Can we guess an Arduino is used somewhere in your game?

Now, please identify the RFID reader and how it is used with the Arduino. Does your RFID documentation hint that it can do what you suggest?
Have you tried your scenario?

3

basic tag readers won't let you register all the tags and it will be hit and miss if the cards are stacked on top of each others.

You could have a look at SparkFun Simultaneous RFID Reader - M6E Nano but it's quite a different budget...

and they have a library

and a fun test

Note I've never used that component nor the library.. so don't know if it's worth it

4

Wow! Thanks for the amazingly quick response.

To clarify the Arduino/Rpi would be attached underneath the gameboard. The RFID reader I have at the moment is the RC522. I noticed the price tag on the reader which J-M-L linked...boy oh boy is that pricy.

I have not tried the scenario, as I don't have an idea how to do that, as I am as green as a shamrock on St. Patty's day (only 2 days to go!). With regards to the tags, I will not be 'stacking' them in the literal sense, but having them placed along side each other. The arrangement of the pieces is more akin to a chessboard, where each piece would have a tag on it and trigger a file when introduce to the board, likely along side other pieces (I suppose this is the same as stacking?)

  • Thanks again,

James

5

Then you need to get busy learning how to use the Arduino and your RFID reader and test the scenario.

6

Hey Paul,

I here what your saying. Your feedback is absolutely correct, and appropriate.

However, I am simply asking if someone knows "if it is at all possible"? I would prefer not to spend a lot of time, and money to discover that it is not. In reading about the' Sparkfun Simultaneous Reader' is appears that it is possible with that specific board, which is outside my budget. That is the reason I am asking it is possible with the board that I have.

But as it stands, your feedback is accurate. I do need more time with the Arduino in general, but the sole reason I am 'getting into it' is to complete this project.

I hope that it is clear I am writing in a positive tone, and not interpreted as argumentative. I just thought I would clarify my intention.

Thanks again to all who have responded

  • James
7

Thanks for the link J-M-L,

That board is expensive, but does appear to do what I need. Its encouraging that, in principle at least, it is possible to do what I want.

Thanks again,
James

8

That being the case, you need to prove your device will do the work or not do the work. Testing will NOT be a waste of time and effort.

Edison discovered over a thousand substances that would NOT work as light bulb filaments.

9

Fair enough, I'll return to this post when I better understand the components, and theory.

Thanks again

  • James
10

Yes, and it was The Englishman Swan who found what would work as a lightbulb filament.

But no RFID reader that uses 13.5MHz tags can read more than one tag in the field at once. The types of tags that can be used are UHF tags and use a different system to the lower frequency tags.

The SparkFun board although it looks expensive is remarkably cheap most readers of that type are about $1000 - $4000.

11

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