RFID Emulator Card Includes A Learning Mode


This RFID card has a lot of nice features. But the one that stands out the most is the ability to learn the code from anther RFID tag or card.

You can see that the board includes an etched coil to interact with an RFID reader. This is the sole source of power for the device, letting it pick up enough induced current from the reader to power the PIC 12F683 seen on the upper left of the board. The underside of the PCB hosts just three components: an LED and two switches. One of the switches puts the device in learning mode. Just hold down that button as you move the board into the magnetic field of the reader. While in learning mode a second RFID tag is held up to the reader. It will identify itself and the emulator will capture the code sent during that interaction. This is all shown of in the video after the break. We wonder how hard it would be to make a version that can store several different codes selected by holding down a different button as the emulator is held up to the reader?

If you want to build your own card reader too here’s a project that does it from scratch.

21 thoughts on “RFID Emulator Card Includes A Learning Mode

    1. Haven’t quite grokked all the code yet as it’s assembler and the comments are half-spanish, but it looks like it should be able to do the HID tags as well but codes it differently.

  1. I love how simple this is, and I’m now thinking about building my own.

    One question though: what’s up with his voltage regulator? Wouldn’t it make more sense just to throw the zener across the coil with a small series resistor instead needing the transistor as well?

  2. You could probably get superior antenna performance just with the outer loops. The inner ones are mostly parasitic. In RFID cards, they use them for impedance matching, but you don’t have that issue.

    1. You’d need to spoof MiFare for that. Just, don’t say it too loud, I believe the last guy to post too much about the inner-workings of Skylanders got a C&D from Activision.

    1. I have been trying to post that here in the comments for the last day and a half.
      Does hackaday have some filter against links or are they just really resistant to accept some critique?

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