Pages: [1]   Go Down
Author Topic: one general question concerning RFID readers...  (Read 379 times)
0 Members and 1 Guest are viewing this topic.
berlin
Offline Offline
Sr. Member
****
Karma: 0
Posts: 293
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

...
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 :-)

best, kuk
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 40
I love YaBB 1G - SP1!
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

berlin
Offline Offline
Sr. Member
****
Karma: 0
Posts: 293
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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?




Logged

0
Offline Offline
Full Member
***
Karma: 0
Posts: 134
panta rei resist the resistors!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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

b.
Logged

Britanny
Offline Offline
Full Member
***
Karma: 0
Posts: 233
Mais vrai, j'ai trop pleuré, toute lune est atroce
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes i'm curious too ! :-?

regards

eric
Logged

Pages: [1]   Go Up
Jump to: