one general question concerning RFID readers...

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

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maybe there are differences between different RFID readers, but i've been wondering what they report if there are several RFID tags in reach. do the tags interfere -> aren't readable , or is it possible to distinguish between them and read them one after the other?

in case there are differences between readers: i mean those that have been successfully used with arduino :slight_smile:

best, kuk

2

Hi:

Using RFID in arduino is tricky because you will recieve a serial stream of 12 bits. The way I got around this was to read the bits from the RFID and store it in a string array.

Each tag does have a unique ID and u can store the bits of the serial stream as characters. So 'F' for 16 will be stored as the letter F.

-n

3

hmm ok. thanks.

someone wrote that not all of those received 12 bits are necessarily important to distinguish between different tags. maybe you can write a function to cut it down to one byte and save only that one byte (8 bits i mean)...

concerning my question i understand that your rfid reader is sending 12bit bytes continuously. meaning that if there are three tags in reach it will send

  • 12 bits describing tag "A"
    then
  • 12 bits describiing tag "B"
  • 12 bits describing tag "C"

and then starting all over with tag "A" in a loop?

is that right?

4

hey nima,
I'm very courios to know your set up.
what reader are you using? how do you connect it to arduino?

b.

5

Yes i'm curious too ! :-?

regards

eric