Radio Frequency IDentification
15
votes
8answers
4k views
Electronic pet-door access control - RFID
Inspired by projects such as the tweeting cat door and CATaLOG [sic] I’m wanting to add some form of automated access control to our pet door to control who can go in and out, when.
(Full Disclosure: ...
11
votes
3answers
507 views
What's the purpose of such weird wiring inside this smart card?
Here's a scan of a stripped MIFARE Ultralight smart card
That's some plastic film with (I assume aluminum) foil wiring acting as the antenna for both powering the chip and providing radio ...
10
votes
5answers
8k views
How do you build your own RFID reader?
What's involved in building your own RFID reader? As you guys would know industrial RFID readers aren't cheap, how do you energise the antenna, then read back the output?
9
votes
3answers
1k views
Best RFID Technology for long range detection?
I am considering building an RFID reader system that can monitor runners times in a foot race. I have read that there are three different types of RFID systems. LF, HF, and UHF. Which one would be ...
6
votes
1answer
207 views
Faraday Cage - Detecting one
I am looking for a cheap and easy way of creating a small electronic device that is capable of detecting whether or not it is inside a Farraday Cage.
Hopefully, without an external sensor/emittor.
6
votes
3answers
987 views
RFID Antenna Array
Is it possible to connect more than one antenna to a single RFID reader module in order to pick up two different RFID chips at once?
I would like to create an arduino project like this..
6
votes
1answer
720 views
(Why) does this design suck?
I'm designing an Open Hardware door-lock-controller for our hackerspace, to these basic requirements:
Be made exclusively from available and inexpensive parts.
Read external Wiegand keyboard
Read ...
6
votes
2answers
6k views
Questions about NFC's card emulation mode
NFC has a mode called "card emulation" in which it can communicate with a RFID reader because it acts as an RFID card. All the literature I have and the web serches I did only got me so far as with ...
6
votes
2answers
157 views
Tracking wandering vulnerable adults
I work in the field of telecare and advances are helping us keep the elderly and vulnerable out of residential homes/hospitals and allowing to retain their dignity and independence by staying in their ...
5
votes
5answers
2k views
Options for short range distance determination between two objects
I have a project idea in mind, but it involves calculating the distance between two people. I've looked into Bluetooth, RFID, and NFC (unsure about this one), but none appear to offer the accuracy I ...
5
votes
1answer
472 views
Long range RFID detection
I have a question about detecting RFID tags at long range. I understand there are LF,HF,and UHF RFID frequencies.
I'm looking to detect a tag from a minimum distance of 2 meters (actually, 5 meters ...
5
votes
3answers
619 views
Problems with a RFID reader from SparkFun
I am hoping someone here can help me.
I am having trouble with a RFID kit I bought from SparkFun. I purchased the USB RFID (SEN-08852) with the RFID Reader ID-12 (SEN-08419) and some RFID cards.
...
5
votes
4answers
1k views
Construct RFID tag to turn on/off?
I am a very novice chiphacker and am asking for ideas on how I might implement something like this.
I am about to start an RFID project, which is the easy part. RFID readers are cheap, arduinos are ...
5
votes
1answer
363 views
How do I determine what kind of proximity sensor / RFID hardware is in a device?
I have several objects in my pockets that do stuff when I put them near things:
A token to disable a house alarm
A Transport for London Oyster Card
A security pass
And in the ...
4
votes
2answers
2k views
RFID antenna DIY
I am very new to this, but wanting to get started and need to construct an antenna for a reader that will pick up a 134.2 kHz RFID tag.
The antenna will need to be in "tunnel/culvert" under a road. ...
4
votes
3answers
177 views
use RFID remotely
From the answers to this question it's clear that RFID is passive and (therefore) doesn't work in the far field.
I was wondering if you couldn't use it remotely if you make an actual transmitter of ...
3
votes
3answers
849 views
sending signal to open car with microcontroller
I am interested in a way of how to open the caar's doors with a microcontroller device's extension hardware (I have an Arduino Uno Rev 3).
I know that the key can do it as well but I want to program ...
3
votes
3answers
206 views
coin shaped rfid tag
The university I study at has a special elevators for masters, and masters have somthing like a coin that they can use the elevator. As I know it's an rfid tag and it is a 125khz one. and have a 100 ...
3
votes
3answers
1k views
RFID reader for a keyless residential entry system?
What are some good RFID readers to look at for a keyless residential entry system? Are there any on the market that can read a key fob or similar RFID token from a range of 3 feet or more? This would ...
3
votes
6answers
1k views
Making a plastic card that looks like a credit card with a long-range module inside
Does anyone know how I could make a card the size of a credit card with something like a GPS/bluettoth/RFID module that could be detected from a relatively long range. The purpose is to see where this ...
3
votes
1answer
137 views
RFID coil - ends broke, can I resolder?
The 125kHz RFID scanner / reader device I have, has a coil like this:
NB> Don't have a good camera handy at the moment, so had to share a cropped image from Alibaba, but the pic is very close to ...
3
votes
2answers
376 views
RFID module always finds the same non-existent tag when seeking
I'm wondering whether anyone has any experience with the SM130 Mifare module. I've managed to get my hands on one, sans antenna of course, and seem to be having a few issues with it.
I've got the ...
3
votes
1answer
284 views
RFID tags orientation issue…how to fix?
We have a product that is a toy bug net. At the bottom of the bug net is a coil that reads bugs with RFID tags in them.
For most of the bugs this seems to work fine and the net is able to identify ...
3
votes
2answers
310 views
Is there a good and reasonably priced way to make a custom RFID reader and barcode scanner that runs Android?
I'm building a system for a small manufacturing business that requires a mobile barcode scanner (at minimum) and would be great if it could be an RFID reader too. I would really like this to be a ...
2
votes
1answer
144 views
Why can a UHF RFID antenna read a LF tag?
How can a RFID UHF (Ultra High Frequency) antenna read a LF (Low Frequency) tag?
I have a antenna designed for UHF made in China, but it can read every tag I have tried (UHF, LF, HF), I don't know ...
2
votes
1answer
319 views
Passive RFID Tag: Unique Identifiers
I'm a bit confused on the uniqueness of each passive RFID tag.. are they unique globally?
Meaning, every RFID manufacturer (no matter if based in USA, China or India) never creates a tag with the ...
2
votes
1answer
250 views
How does Sifteo and Scrabble Flash tiles handle proximity and ID?
Sifteo and Scrabble Flash
These tiles will sense and ID tiles that are adjacent to each other.
On the Sifteo site it mentions proprietary near field sensing technology. How does it work? Does each ...
2
votes
1answer
422 views
Does a RFID antenna need to be FCC certified?
Being a RFID UHF antenna a "passive" element does it need to be FCC certified? Or, we just need to have the RFID UHF reader certified?
2
votes
3answers
400 views
How can I locate items from a phone? RFID?
I'd like to be able to put something small on items (eg glasses, car keys, etc) and have an Android or iPhone app that will tell me the direction or proximity of a certain item. Current phones usually ...
2
votes
1answer
96 views
Options for object tracking
Say a company has a parking garage for its employees, and they want to track the traffic in and out. So they require that all employees put some kind of tag in their car window, and they have some ...
2
votes
1answer
185 views
Antenna coil resonant for 134.2KHz
What would be the best N turns, when building a simple layer antenna coil to be resonant to 134.2kHz?
Based on this specifications:
1mm insulated copper wire.
4.5cm diameter.
Minimum length (based on ...
2
votes
1answer
346 views
How to determine if an RFID system supports reading multiple tags at once?
In this answer the following is stated:
Most RFID protocols include singulation so that if you put dozens of
RFID tags in front of it, and then turn on the RFID reader, it can
read the correct ...
2
votes
2answers
261 views
Does RFID interfere with NFC
i have a small question about interference. Do active RFID (860 MHz) interfere with NFC cards (13.56 Mhz) when placed on top of eachother? (NFC above RFID tag for example). Thanks!
2
votes
1answer
180 views
RFID car tags vs hand held tags, how exactly are they different?
The basic principle of RFID tags in cars for toll collection is the same as the hand held tags we use to open doors.
How exactly are they different? How come my door RFID reader does not read my tag ...
2
votes
3answers
81 views
Wireless communications for distance estimation (RFID perhaps?)
What I want to do it is measure the distance between two points/ devices which are constantly moving apart or together. The value for distance isn't really required I'd just be looking to have an ...
2
votes
1answer
39 views
Manufacturer codes for E0 RFID tags
I have an RFID tag and I would like to know the manufacturer. According to RFID journal, the E0 format uses an 8-bit manufacturer ID. I've got this code. Is there some table where I can look up the ...
2
votes
1answer
2k views
Read RFID tag with NFC reader?
Can I read passive RFID tag (125/134 kHz) with a NFC tag reader, like the one on Samsung Galaxy S3 ? If not, why: maybe because of the different frequency of the NFC reader (13,56 MHz)? Any way to to ...
2
votes
1answer
172 views
The reading distance limit on passive RFID
It appears that nearly all "passive RFID" tag-reader combinations have around a 5-10cm specification for reading distance.
But I am interested in approx. 20 cm reading distance.
I am assuming one of ...
2
votes
1answer
721 views
RFID Reader UART
Was wondering if someone could give me a hand with a project that I am undertaking. I have searched forums high and low and am yet to find the information to solve my problems.
Basically I have an ...
2
votes
2answers
685 views
trying to find or make a very light/small chip (rfid, bluetooth, etc) that can send its location to a cell phone if lost
I was wondering which technology would be better suited to the goal I am trying to achieve. What I would like to do is embed a chip in an object and by using a cell phone, prompt the chip to send me ...
1
vote
4answers
366 views
Why most does RFiD tags use hexadecimal number?
RFiD tags store one 24-digit hexadecimal number, why 24-digit hexadecimal number?
Thanks!
1
vote
2answers
4k views
Seeking cheap RFID reader / writer
What I do not want is one of those RFID readers which attaches to serial or USB port and writes its input to stdin.
I am looking for cheap & nasty RFID reader which I can query over serial or ...
1
vote
3answers
1k views
Building a RFID-Zapper from the scratch
I would like to build an RFID-Zapper from the scratch (not based on a camera flash).
Since it is working with a high voltage, I prefer to ask first.
Does this look OK to you?
The capacitor is ...
1
vote
1answer
353 views
What's the technical limit to how small RFID-like system antenna can be?
So far I haven't seen a contactless smart card smaller than a standard credit card. My "biometric" travel passport holds a chip powered off the antenna - I lit the plastic holding the chip through ...
1
vote
4answers
569 views
Combining RFID badges
I have multiple RFID cards that I use to get into parking garages at the office, client site, home, parents place, etc, etc, etc.....
I'd like to either
A) combine all of these into 1 card or ...
1
vote
2answers
182 views
If I have drawn an IC. Are there any manufucters that you can go too tom implement it? [duplicate]
Possible Duplicate:
How much does it cost to have a custom ASIC made?
I have drawn a IC for an RFID application. And I want the IC to be super small. I wonder if there are manufacturers I ...
1
vote
2answers
244 views
Is that a capacitor and how does it work?
I'm trying to understand how my (rfid?) travel card works. It looks like this:
I'd like to know if the two portions of wire shown at the end of the arrows are capacitors and, if it is the case, how ...
1
vote
4answers
3k views
134.2 kHz RFID reader for Arduino
I am looking for an Arduino-compatible RFID reader supporting ISO 11784 & 11785, in order to read tags used for animals (mostly cats and dogs) identification.
I found both RMD660 and and Sniffer ...
1
vote
1answer
206 views
How to design an Oscillator Circuit (500 MHz range) with no Op amps?
I am trying to design an Oscillator circuit which can produce a good sine wave with a frequency of at least 500 Mhz. This is for RFID applications. I have tried to use an class E oscillator, but i ...
1
vote
3answers
498 views
Estimating costs for producing and implementing RFID systems
What type of RFID could I attempt to emulate myself easily for projects in a classroom. There are many technologies that are available and I am having a hard time selecting an RFID system that would ...
