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What is the principle of swipe card to unlock?

Discussion in 'Radio and Wireless' started by bancroft, Aug 2, 2021.

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  1. bancroft

    bancroft

    67
    2
    Apr 23, 2021
    I got interested in swipe cards to unlock after reading an article today, but first I need to figure out two things.

    How do swipers identify different cards? And what does the so-called RF mean?
     
  2. WHONOES

    WHONOES

    1,170
    319
    May 20, 2017
    Why do you want to read swipe card data?
     
  3. bancroft

    bancroft

    67
    2
    Apr 23, 2021
    I want to implement the function of swipe card unlock, then I want to know whether the reader reads the frequency of the card or ID? or something else.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,667
    2,700
    Nov 17, 2011
    The classic swipe card uses magnetic strips to encode information and requires a magnetic card reader.
    The card in the article you linked to is no such card but an RFID card. An RFID card requires a card reader that emits a high frequency electromagnetic field. This field is picked up by an antenna on the card and used to power the card's microcontroller. Data is transmitted between the reader and the card by modulating the electromagnetic field. See e.g. this tutorial.
     
    bancroft likes this.
  5. bancroft

    bancroft

    67
    2
    Apr 23, 2021
    Thank you very much, I think this tutorial helped me a lot and I can understand RFID very well.
     
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