Sniffing RFID Readers With A Piece of Paper

We feature plenty of printed projects here on Hackaday, though they tend to be of the three dimensional type thanks to the proliferation of affordable 3D printers. But in this case, [Milosch Meriac] has managed to put together a printable design that’s not only a very cool hack, but is made up of a scant two dimensions. His creation, which could perhaps be considered something of an interactive circuit diagram, allows anyone with a paper printer and a few passive components to make a functional low-frequency RFID sniffer.

[Milosch] tells us the goal of the project is to lower the barrier for experimenting with the RFID technology that’s increasingly part of our everyday lives. Rather than having to use something expensive and complicated such as an oscilloscope, experimenters can simply plug their DIY RFID sniffer into their computer’s line-in jack and explore the produced waveform with open source tools.

To create a paper RFID sniffer, you start by printing the image out on a thick piece of paper, like card stock. You then apply foil tape where indicated to serve as traces in this makeshift PCB, and start soldering on the components as described in the text. [Milosch] says the assembly procedure is so simple even a kid can do it, and the total cost of each assembled sniffer is literally pennies; making this an excellent project for schools or really any large group.

If you want to play it safe the sniffer can be connected to a USB sound card rather than your machine’s primary sound hardware, and still come in dirt cheap. [Milosch] stops short of explaining the software side of things in this particular project, but any tool which can use input from the sound card as a makeshift oscilloscope should be a good start.

In the past we’ve seen [Milosch] perform low frequency RFID sniffing through the sound card with the powerful baudline tool, but if you want a little more capable hardware, we can point you in the right direction.

16 thoughts on “Sniffing RFID Readers With A Piece of Paper

  1. Very similar to how I got started with electronics – those Dick Smith kits with a grid where you wired your circuit point-to-point. Ahhh, those were the days (when you could actually see the components!).

    1. was it the little plastic board with the screws of the one with the springs?
      The screw ones were prety cool but the spring ones made life so much simpler until the springs lost their tension then you were forever trying to find the open circuit.

      1. I had another… started with a paper grid (with circuit drawn on it) that was stuck to chipboard. Screws were a pain to get in because I didn’t have a drill to drill pilot holes! I then moved to something called a “P-box” which was like a veroboard with no copper strips, just holes and the wires connected underneath. Finally I got one of those spring-clip “101 in 1” “kits”, which worked really well until the springs got tarnished and gave intermittent connections.

        1. I wanted the Dick Smith kits but my family moved to a remote part of world where I had no hope of buying one. I did, however, get my hands on an old electronics textbook and I was able to buy a handful of discrete components which I then wired up with some 240V terminal blocks. First time I wired up an oscillator and hooked up the speaker I damn near wet myself!

  2. That’s pretty cool I have an 80m DIrect conversion DSB receiver using that technique of copper tape. It’s works great.

    Just pop down a bit of electrIcal tape over a track if you need to cross traces

  3. It would be interesting if the headphone output could be used to create a carrier, and thus make a full analog RFID reader.

    Would be interesting if the Circuit could be modified to Actually do that.

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