Hi,
I want to track people around a Table. To do that i want to use RFID technology.
My idea is, to put on every edge an RFID reader. The people have a RFID chip in their pocket.
The RFID reader should work on a distanc at apprx. 0.5 meters.
Can you tell me, which hardware i should use to do that?
Thank You
The RFID reader should work on a distanc at apprx. 0.5 meters.
That is pushing it for most RFID readers.
Remember that an RFID reader will not read if two or more tags are in the field at the same time, therefore the people seated round the table have to be separated by at least the reading range of the readers if not twice it.
When you have two or more RFID readers separated my less than a meter it reduces the reading range.
Grumpy_Mike:
The RFID reader should work on a distanc at apprx. 0.5 meters.
That is pushing it for most RFID readers.
Remember that an RFID reader will not read if two or more tags are in the field at the same time, therefore the people seated round the table have to be separated by at least the reading range of the readers if not twice it.
When you have two or more RFID readers separated my less than a meter it reduces the reading range.
Thank you Grumpy_Mike for your answer!
Is there no RFID reader for multiple reading?
Do you have maybe a better idea to handle this problem?
Thank You
Is there no RFID reader for multiple reading?
There are but they require special tags and so are expensive.
If you go for the UHF tags and reader you may be able to read all the tags with one reader the tags are cheap but the reader is very expensive $300 +
Do you have maybe a better idea to handle this problem?
Not quite sure what the problem is and why it needs a solution like this.
Sounds like a professional version of musical chairs. 8^)
KeithRB:
Sounds like a professional version of musical chairs. 8^)
What do you mean?
Grumpy_Mike:
Is there no RFID reader for multiple reading?
There are but they require special tags and so are expensive.
If you go for the UHF tags and reader you may be able to read all the tags with one reader the tags are cheap but the reader is very expensive $300 +
can you give me an example product? So for my case I would need $1200 because i need 4 readers for every edge on the table, right?
Grumpy_Mike:
Do you have maybe a better idea to handle this problem?
Not quite sure what the problem is and why it needs a solution like this.
I have a digital tabletop system and i want to track the position of the people around the tabletop to make pop-ups for the user on the right place.
I have a digital tabletop system and i want to track the position of the people around the tabletop to make pop-ups for the user on the right place
Ok so a multiple tag reader would not do for that as the one reader would read all the tags. I don't think there is a commercial soloution to that.
It is close to the RFID sequencer I made last year only with a much larger range. I can't see a soloution involving RFID. How about image recognition or getting them to have bar codes on there lapels.
Grumpy_Mike:
I have a digital tabletop system and i want to track the position of the people around the tabletop to make pop-ups for the user on the right place
Ok so a multiple tag reader would not do for that as the one reader would read all the tags. I don't think there is a commercial soloution to that.
It is close to the RFID sequencer I made last year only with a much larger range. I can't see a soloution involving RFID. How about image recognition or getting them to have bar codes on there lapels.
What a pity 
Because of usability reasons it would be nice for example if the user can have a device on their key rings. Another option is to use the mobile phones in their pockets which are bluetooth enabled. Maybe i can track them with four different bluetooth AP. What do you think about that solution?
Maybe i can track them with four different bluetooth AP.
Yes that sou dislike it will work better.
Hi,
i talked with my peoples and we decided that the best way is rfid for us. And 15cm distance would be okay
for us. (Maybe we combine it with bluetooth later)
Do you have a good idea which rfid readers we should use for this solution?
Do you have a good idea which rfid readers we should use for this solution?
Well no because I donn't think it will work. I did design RFID readers for several years.
Good luck.
Grumpy_Mike:
Do you have a good idea which rfid readers we should use for this solution?
Well no because I donn't think it will work. I did design RFID readers for several years.
Good luck.
I have an idea. If I only use one RFID Reader, then it is possible to read more than one RFID tag, right?
(I think so, because i saw a project which dedectes edibles in a fritch)
Do you know which RFID Reader i need to do this in a range of 15cm?
Only a very few readers can cope with more than one tag in the field at once. They tend to be expensive so look for one of those first and then see if it has the range.
Grumpy_Mike:
Only a very few readers can cope with more than one tag in the field at once. They tend to be expensive so look for one of those first and then see if it has the range.
Do you know some god websites to search for RFID reader? Do they have a special name if there are able to read mot then one RFID tag?
They never really write about mubltiple reading...
They never really write about mubltiple reading...
If they don't mention it then they can't do it.
Some links to help you:-
Why wouldn't you use a tag that would be clipped on their clothes at around the same level as the table edge, and then put a reader at every spot? You would only need a 10-20cm read distance, which is doable, and you would meet the separation criteria so that you don't run into the issue of multiple tags in the same field.
The 125kHz tags and readers seem to have this range and it appears that you can even tune it up or down a little by using differnt sized antenas.
From what I have read, I agree with the idea that it will be difficult/expensive to read multiple tags with one reader.
and it appears that you can even tune it up or down a little by using differnt sized antenas.
No you can't.
A reader will read any tag in the range of 105KHz to 150KHz and this is not affected in any way by the size of the antenna. I know I have designed readers.
rwiens:
Why wouldn't you use a tag that would be clipped on their clothes at around the same level as the table edge, and then put a reader at every spot? You would only need a 10-20cm read distance, which is doable, and you would meet the separation criteria so that you don't run into the issue of multiple tags in the same field.The 125kHz tags and readers seem to have this range and it appears that you can even tune it up or down a little by using differnt sized antenas.
From what I have read, I agree with the idea that it will be difficult/expensive to read multiple tags with one reader.
That is maybe a good way. I road that it is possible to use only one reader with multiple antenas. So I need one reader and 4 or 8 antenas with a multiplexer.
Do you know a rfid reader which works good with arduino?
I think 10-15cm is fine.
And with one reader i do not disrupt the other readers :).
Do you know a rfid reader which works good with arduino?
As the arduino only received data it can work with any RFID reader. The hardest to cope with will be those with a USB output so avoid them.
If you want reading distance, you'll have to forget about regular 125kHz cards or 13.56MHz RFID Tags. You'll need UHF or special long range tags.
UHF readers are also capable of reading multiple tags at one time, but you just want to read once in every location.
You can use just one reader, an antenna multiplexer (like this http://www.impinj.com/Speedway_Reader_Antenna_Hub.aspx) and as many antennas as spots. But we are talking about +2000 dollars. I don't think an Arduino will be able to handle the communication with the reader either, you might need a PC.