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Bought RFID reader from Radioshack and cannor find card codes. — Parallax Forums

Bought RFID reader from Radioshack and cannor find card codes.

eagletalontimeagletalontim Posts: 1,399
edited 2009-07-20 02:41 in General Discussion
Like the subject says, I bought a Parallax RFID card reader #28140 from Radioshack which has 2 cards with it. Is there a way to retrieve the card keys? I am making a simple alarm system that does not use a keypad but it does need some sort of security to not allow all RFID cards to be used.

Comments

  • JonnyMacJonnyMac Posts: 9,213
    edited 2009-07-19 13:17
    Parallax is pretty good about providing demos for its products; there's an SX/B demo on the RFID reader page:

    www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/114/Default.aspx
  • eagletalontimeagletalontim Posts: 1,399
    edited 2009-07-19 13:58
    I have the demo running that is in the help file for the RFID but I cannot get only one of the cards to deactive the system and the other be like someone else trying to unlock the system. In the help file it has the data for each card you want to be able to unlock the system but none of the keys match the data. I am just trying to find what the keys embedded data is so I can add it to the code to unlock they system [noparse]:)[/noparse]
  • Mike GreenMike Green Posts: 23,101
    edited 2009-07-19 15:02
    You will just have to read the codes from the cards using a modified demo program that just displays what's received. Keep in mind that the codes may be read wrong as the key gets closer to the RFID sensor. Eventually, the received code stabilizes to the correct value. You can also use a TTL to USB serial adapter to attach the RFID reader to your PC so you can watch the received codes using a terminal program like HyperTerminal or the Propeller Serial Terminal.
  • eagletalontimeagletalontim Posts: 1,399
    edited 2009-07-19 15:06
    Ok, I will work with that and see if I can get it. I am using the WATCH function to watch what is read from the RFID right now, but I guess I need to convert each retrieved Byte into a 1 digit hex. I have a pen and paper out and set the output to break for 1 second to give me time to write down the READ difference between the data and the card. I set the DATA to "0123456789" and "000ABCDEF". When it loops back to 48, which appears to be 0, I know to start with the alphabetic characters. Hopefully I get this tongue.gif
  • eagletalontimeagletalontim Posts: 1,399
    edited 2009-07-20 02:41
    I was able to decode each key and get only one to unlock the system [noparse]:)[/noparse] Now all I have to do is wait until some of the key chain ones come in on here. I need 3 of them for my home security system.
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