# Need help with NFC project!

Hello people. i am currently working on a logging system, which requires NFC. the thing is that i don't know alot about NFC with arduino so i wanted your help. simply put there will be a reader, and a writer. the writer is going to write a value onto a NFC tag, which has to be read from the reader later on. will this be possible?

lets make a scenario.
Bob has to work 2 hours from the time he turns in his card(chip)
Bob meets up at work at a random time, the choice is his.
Bob chooses to meet up at 15:00.
Bob scans in his card(chip)
a writer adds 2 hours to 15:00, so the card(chip) now has a value of 17:00
every time bob have done a task, he scans his chip on a reader.
Bob finishes a task, lets say every 5 minutes. and scans in his chip, just for the reader to tell him how many minutes of work left he have left to do.
if/when he scans his card(chip) and the 2 hours has gone, ie. the reader knows that it is 17:05 o'clock, it tells him that he's done for today.
Bob then resets his card(chip) for the next time he has to work.

but all this NFC and RFID is quite confusing to be honest. what is the difference?

NFC is the mechanism that RFID works on.
So if it is RFID then it works by using NFC.
If it works by NFC it is not always RFID because RFID is just one of the things you can do with the near field coupling effect.

The RFID doesn't change. When an employee turns in his badge on his last day, do they reprogram it or reassign it the next emploee?

raschemmel:
The RFID doesn't change. When an employee turns in his badge on his last day, do they reprogram it or reassign it the next emploee?

lets make a scenario.
Bob has to work 2 hours from the time he turns in his card(chip)
Bob meets up at work at a random time, the choice is his.
Bob chooses to meet up at 15:00.
Bob scans in his card(chip)
a writer adds 2 hours to 15:00, so the card(chip) now has a value of 17:00
every time bob have done a task, he scans his chip on a reader.
Bob finishes a task, lets say every 5 minutes. and scans in his chip, just for the reader to tell him how many minutes of work left he have left to do.
if/when he scans his card(chip) and the 2 hours has gone, ie. the reader knows that it is 17:05 o'clock, it tells him that he's done for today.
Bob then resets his card(chip) for the next time he has to work.

Understand?

So an RFID badge is READ/WRITE ? I didn't know that. I though it was a programmed or fixed number and all the recording was done by the system reading in that number and processing the read info into a database. Are there two types ? READ ONLY and

raschemmel:
So an RFID badge is READ/WRITE ? I didn't know that. I though it was a programmed or fixed number and all the recording was done by the system reading in that number and processing the read info into a database. Are there two types ? READ ONLY and

I have no idea if it is read write to be honest. ive just seen people work with RFID, and thought that i might have been able to work. would NFC be the way forward you think? also, for a NFC reader and/or writer, what should i go with, if it has to work with arduino?

raschemmel

The ones I have played with have a limited amount of memory on the card itself. I don't have them to hand at the moment but I think they have 1k of memory available.

raschemmel:
So an RFID badge is READ/WRITE ? I didn't know that. I though it was a programmed or fixed number and all the recording was done by the system reading in that number and processing the read info into a database. Are there two types ? READ ONLY and

Most are read only, but a class of 13MHz smart cards have a section of the card that will store data. These are used for things like emoney, in the Oyster card that they have in London for the public transport. Or for canteens in the Army.

Well at least I was in the ballpark ...

raschemmel:
Well at least I was in the ballpark ...

Close enough for a question entitled "Need help with project!" in the "Project guidance" section.

Back to the original question:-

Do you guys have any idea what kind of system i should use for this?

Is there only one reader / terminal?
If so there is no need to store anything on the card, it can all be stored in a data base on the computer / arduino.
Just use a normal RFID.

If there needs to be multiple readers then yes use a smart card type of RFID.

kasperhangard:
Hello people. i am working on a NFC or RFID chip.
-Kasper

welcome. would you be so kind as to go back and edit the subject line to include RFID and NFC ?

the guru that might have the clue is one of the few that might eschew this thread.

Grumpy_Mike:
If there needs to be multiple readers then yes use a smart card type of RFID.

... or the readers need to be able to share data. I suspect that adding communication between readers would be simpler than writing to RFID tags.

dave-in-nj:

kasperhangard:
Hello people. i am working on a NFC or RFID chip.
-Kasper

welcome. would you be so kind as to go back and edit the subject line to include RFID and NFC ?

the guru that might have the clue is one of the few that might eschew this thread.

Hello and thank you. i am sorry for the noobishness i have put you through!

I have edited the info too.