Blog Image

RFID sniffer

About this project

RFID is everywhere. Use the easy to build RFID sniffer to find out if objects are tagged.
The RFID sniffer is a simple analog electronic circuit which can detect the presence of 13.56 MHz RFID tags. These tags are commonly used in all kinds of plastic cards like access badges, bank cards, library cards, loyalty cards and so on. Also many other objects may carry RFID tags without you knowing it. Books, toys, and even clothing might be tagged. Carrying tagged objects with you can reveal your identity or whereabouts to anyone equipped with the appropiate tools to read RFID tags.
The RFID sniffer helps you identify which objects are tagged, and which are not.

Extra RFID sniffer workshops at Mediamatic

RFID sniffer Posted on 2009-04-21 18:42

Due to high demand, two extra RFID sniffer workshops are scheduled for May 22nd and June 18th.

After some shortage due to all the publicity, RFID sniffers and kits are now back in stock!

RFID sniffer workshop in nrc•next

RFID sniffer Posted on 2009-04-10 19:10

A 2-page report with photos of my RFID sniffer workshop at Mediamatic
in Amsterdam on April 4th 2009, in the April 8th edition of the Dutch daily newspaper nrc•next. By Robert Buzink (who also succesfully assembled a RFID sniffer) and Jørgen Krielen.

RFIDuino workshops at Mediamatic

RFIDuino Posted on 2009-04-07 19:41

Following the huge success of my RFID sniffer workshops, the first RFIDuino workshop will be hosted by Mediamatic in Amsterdam, on May 15th, 2009.

At this workshop you will assemble an RFIDuino, and start coding RFID applications right away on your Arduino. Bring your own Arduino and laptop!

The first workshop is already sold out, but a second is scheduled for June 19th.
Sign in here:

RFID sniffer delivery

RFID sniffer Posted on 2009-04-06 11:12

Electronic parts of RFID sniffer kits are back in stock, but I’m still waiting for the lanyards and sleeves. They are currently in production, and will be shipped to me this week. I will send out all RFID sniffer kits immediately upon arrival of the lanyards.
If anybody who already ordered can not wait any longer, and wants to start soldering right away, please let me know and I will ship the kit without lanyard and sleeve and ship those afterwards at no extra cost.
Apologies for the unexpected delay.

RFIDuino kit now available

RFIDuino Posted on 2009-04-02 18:48

RFIDuino is a Arduino shield which can read and write 13.56 MHz ISO-14443A (Mifare) RFID tags. It plugs upside-down on top of a Arduino, maintaining a 20mm board to board spacing. Mounting hardware and assembly instructions are included.
Free Arduino code library available soon. Here’s a simple example to read tag ids.

The RFDIduino kit is now available at

RFIDuino is here!

RFIDuino Posted on 2009-03-31 21:44

This morning I received my first batch of RFIDuino circuit boards. I quickly assembled one to see if my zero-defect design philosophy still holds… and yes, it did!

Even without tweaking the component values, I got clear readings from
several types of Mifare tags I have lying around (1K, 4K and
UltraLight). Shown here is a Arduino Diecimila next to my RFIDuino, and a ikTag, which is a Mifare 1K RFID tag.
The RFIDuino plugs upside-down onto the Arduino, and has its LEDs mounted through-hole, literally.

In the next few days I will do some more testing and finalize the kit
contents. RFIDuino will be in my web shop very soon! I will offer the
kit for €45 plus €5 for shipping.
I will also write up some more elaborate code examples, possibly a full-fledged Arduino library, to make life easier for you
RFID coders 🙂

RFID sniffer in MAKE magazine

RFID sniffer Posted on 2009-03-26 10:55

One step closer to eternal fame.. I’m in MAKE magazine!

Ironically, I was in New York instead of Amsterdam at the time of publishing, so I could not handle the wave of new orders resulting from this blog post. Shipping will resume as soon as all parts are back in stock.


RFIDuino Posted on 2009-03-11 14:42

RFIDuino is an Arduino shield for reading and writing 13.56 MHz RFID

tags. It consists of a 65x65mm circuit board, which plugs upside-down onto a

standard Arduino (NG, Diecimila, Duemilanove, or BlueTooth).
The board has a build-in
antenna and contains all the circuitry to read and write 13.56 MHz ISO-14443A (Mifare) RFID tags. It is connected to the Arduino by I2C, using the Wire library.

I build a prototype during Picnic ’08, documented here.

The production version will be available
in my web shop from early April.

« PreviousNext »