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Author Topic: RFID tag reader ....  (Read 2350 times)
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TucoRamirez
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« on: June 21, 2013, 10:00:30 22:00 »

hello

I want to build a 125Khz reader module .

But before start i have some questions

as long as i read the only chip available in farnell is the ATMEL - U2270B-MFPY  ....

and in the other side mikroe sells the ua4095 based one:


http://www.mikroe.com/downloads/get/1240/rfid_manual_v100.pdf


I'm guessing (fuctard's question number 0)  if i can reuse the pcb antenna form in order to do it in my own u2270 design .. or i got to do an external coil Huh


and Q number 2:  do you know another supplier for the ua4095 one???

many thanks

Posted on: June 21, 2013, 09:50:40 21:50 - Automerged

ok: autoreponse and autoquestion again

i found this

http://www.circuits.dk/calculator_planar_coil_inductor.htm

this applies to the 1.35mH coil /antenna

it's true ot i have a beer overdose?
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sherm
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« Reply #1 on: June 27, 2013, 03:01:21 15:01 »

I'm not sure about the readers you've mentioned, however I've done a fair few projects in the past using the Innovations ID-12. It operates at 125KHz and has no need for an external antenna. Output is in ASCII so you can use it with practically any type of microcontroller. I'm not sure if that exact reader is available anymore, however Innovation does have a fairly comprehensive range to suit a number of different purposes. It might be worth your while to check them out since they're very easy to implement.

http://www.id-innovations.com/httpdocs/Modules(non%20write).htm

Edit: They are still available. Sparkfun have them for under $30.

https://www.sparkfun.com/products/11827
« Last Edit: June 27, 2013, 03:04:25 15:04 by sherm » Logged
TucoRamirez
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« Reply #2 on: June 27, 2013, 11:37:38 23:37 »

I bought on ebay the 4095, i'm  waiting its arrival, i still have some questions about the pcb antenna ... anyway, i'll try it when i'll have the IC
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Parmin
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« Reply #3 on: June 28, 2013, 01:14:21 01:14 »

Due to the low cost reader modules, I strongly advise not to build your own, unless your are bored and have nothing to do (then you can change the oil for my car)  Tongue

Cheap readers such as ID-12, ID-11 or the even cheaper sibling EM-18 (commonly used for Chinese domestic market) are easily available.

My suggestion is to go for the higher frequency MIFARE version rather than 125kHz stuff.
IMO The Mifare system are a bit more robust against interference.
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TucoRamirez
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« Reply #4 on: June 28, 2013, 06:18:40 06:18 »

I strongly advise not to build your own, unless your are bored and have nothing to do (then you can change the oil for my car)  Tongue

No i have not enough Skills to do that ^^

... Anyway i'll wait two weeks till receive the IC's ...  i'll play a little with the em4095 anyway....

i want to have my first steps on rfid universe in the semi diy way ^^ ...  I'm expecting to put the 4095 with a pic, a lcd and a cdc link to pc to test codes and then enable acces to my door ^^ :p  (ok that was not funny)


off-topic question:  do you know a reliable chinese supplier for buying some meters of RGB individually controlled Led Strips???  (kinda WS2801 ) ... i watched some stuff on the www but i'm not sure at all of a reliable one ...  thnks
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Parmin
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« Reply #5 on: June 29, 2013, 02:09:35 02:09 »

No i have not enough Skills to do that ^^

Too bad.. my old bones cannot bend down much nowadays..

off-topic question:  do you know a reliable chinese supplier for buying some meters of RGB individually controlled Led Strips???  (kinda WS2801 ) ... i watched some stuff on the www but i'm not sure at all of a reliable one ...  thnks

Of course, but they want to get a MOQ of a few hundred meters..
And what is "reliable"?  is that as long as a piece of string?
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card_claud
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« Reply #6 on: July 06, 2013, 04:12:36 16:12 »

just for add some information, there´s a company called stronglink (google it) that has some readers with  no external antenna, and they are small

Cláudio
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peixoto
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« Reply #7 on: August 09, 2013, 05:08:33 05:08 »

It's been a while but if you want some help on antenna design, TI have tons of reference material.

Another place you can also look for info is edaboard[dot]com

It helped me a lot, but I was designing an antenna for an ISO14443 system.

Anyway, I would give you the same advice as Parmin and tell you to try this standard instead of 125kHz, since readers for it are so cheap. Also mobile phones that are NFC capable are compatible with this standard, this would give you lots of potencial applications to play with.
« Last Edit: August 09, 2013, 05:10:52 05:10 by peixoto » Logged
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