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Simple RFID reading circuit, and simple RFID code?

Catwell

Can anyone direct me, or show me, a simple circuit for reading the RFID info from a tag?

 

And, is there a way to make my own simple RFID tags? I do not need a long string of information. In fact, it would be ideal is I could just code in a single digit number to a tag. (10 possible codes.)

 

Detecting proximity is the ultimate goal, for the record.

 

Thank you ahead of time.

 

Cabe

Parents Reply
  • in reply to nermash

    Cool hack but with the obvious drawbacks - 125 kHz system only, probably too much spurious emissions for any real (legal) usage. Tag is cool but again 125 kHz.

     

    I know that someone - I think it was Schneider Electric - once did a 13.56 MHz tag based on a low-power MCU years ago and could read it at 30 cm (if I recall correctly). The good thing about a MCU-based tag is that you can potentially connect any type of sensor to it and even power it from the field.

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  • in reply to Former Member

    I know a very good and reasonable cheap RFID system on 13,56Mhz.

     

    You buy the MLX90121 of manufacturer Melexis and construct the reader with the application notes provided by this chip. (limited ammount of hardware)
    You connect this reader to a microcontroller to control the reader en to send the UID that you read from the tag via any form of communication to a PC.
    The tags are cheap and provide enormous posibilities to write extra data in the memmory of the tags. (I prefer 13.56MHz tags from Texas Instruments)

     

    You can also buy the evaluarion or development board that uses this specific RFID chip.

  • in reply to Former Member

    @Franklin: the MLX is a nice IC but as with all RFID protocol ICs I know (which is quite a few) the reference designs delivered with it only get you so far - but the result does work (we have improved on it significantly, though...). Better read range and easier integration is available using good quality modules.

  • in reply to Former Member

    Indeed with a good design you can improve the quality significantly. Some points that are very important are

    • Antenna (material used, matching network, size, form (flat PCB or tube or ...)
    • Reader PCB and casing (interference between signal lines, connection between reader PCB and antenna, ...
    • Controller hard- and software

     

    @metraTec : I just visited the website of your company and indeed the RFID systems specs are high performance systems.particlary the lambda40 antenne is amazing.