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Author Topic: I need 125Khz rf-id reader project  (Read 3776 times)
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sahin2580
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« on: October 22, 2007, 05:28:30 17:28 »

Hi,
if anyone have rf-id card reader project help me about it.
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somewhere
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« Reply #1 on: October 22, 2007, 10:04:25 22:04 »

That a very good project, have a look.

http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2006/cjr37/Website/index.htm

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mark6
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« Reply #2 on: October 22, 2007, 10:33:45 22:33 »

Hi there. I have recently designed an RFID reader and been through a development process trying a number of different ICs. I can't give you schematics or code but I can point you in the right direction:

There are two very good ICs to use:

1) Atmel U2270B - available from www.atmel.com (buy from www.farnell.co.uk)
2) EM4095 - available from www.emmicroelectronic.com

Both of these are 125kHz passive read/write ICs that act as a front end for your reader. Simply follow the design guidelines on the Atmel or EM websites and they show you how to create a circuit that will produce an encoded output from a tag with minimum components.

This data stream from the above devices must be decoded to obtain the actual tag serial number. You will need to obtain the datasheet from the RFID tag you want to use to find out the encoding type (i.e. Manchester encoding, PSK) and data rate and then use a microcontroller to decode the bitstream and create an interface (RS232, USB, CANbus, etc.) to send the serial number out on.

Hope this helps.

Mark

Mark
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patoun49
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« Reply #3 on: October 23, 2007, 07:58:19 07:58 »

Hello,

See on the site of Elektor, they described an assembly containing microprocessor 2013 of Atmel.

A+
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mark6
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« Reply #4 on: October 23, 2007, 09:53:34 09:53 »

If you need to buy any 125kHz tags in small quantities try this company:

http://www.rfidshop.com/passive-low-frequency--125khz---1342khz-10-c.asp

I have ordered lots of different sorts of tags from them. The 'eUnits' are good for development as the chip is on a small PCB and you can solder wires to the tag chip pads and look at how the tag responds using an oscilloscope.

http://www.rfidshop.com/30mm-e-units-unique--em4102-pack-of-10-1215-p.asp

Mark
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corbo
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« Reply #5 on: January 18, 2008, 12:44:00 12:44 »

 .. .. maybe this project will help you .
RFID Lock

http://rapidshare.com/files/84732344/RFID_Lock.rar
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yahoo
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« Reply #6 on: January 19, 2008, 01:42:21 01:42 »

Very simple reader using discrete components:

http://www.radioland.net.ua/sxemaid-452.html

PS: sory if it is posted above, I cannot see the links :-(
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kelvar
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« Reply #7 on: January 20, 2008, 04:27:12 16:27 »

Wow. I didn't realise the ID-12 sensor is that big.
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prog
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« Reply #8 on: April 17, 2008, 04:59:43 16:59 »

If still there is an interest, can help with readers on 125 and 134 KHz.
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Tomandr
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« Reply #9 on: April 18, 2008, 09:32:20 09:32 »

http://www.circuitcellar.com/avr2006/winners/DE/AT3305.htm
http://instruct1.cit.cornell.edu/courses/eceprojectsland/STUDENTPROJ/2004to2005/dmr38/
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