Questions tagged [rfid]

Radio Frequency IDentification

Filter by
Sorted by
Tagged with
13
votes
3answers
1k 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 ...
9
votes
1answer
20k views

What can I do to increase passive HF RFID read range?

I am working on a prototype, one function of which is to detect whether an object is "in range" by a few cm. Right now I'm just using an Arduino and a cheap Mifare RC-522 kit that operates at 13.56 ...
7
votes
2answers
5k 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..
3
votes
4answers
7k 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
1answer
2k views

Are there types of passive RFID tag which can connect to control logic?

its been a few years since i've done any electronics but have been asked to research the viability of an idea and have gotten stuck... We want to transmit a timing signal from RFID readers which will ...
15
votes
6answers
49k 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 ...
6
votes
1answer
20k views

NFC reader long range antenna

As part of my university project I am trying to read NFC data (13.56MHz) at a longer range (~60 cm). I have already developed code that reads data from the card at close proximity, using libnfc and a ...
2
votes
2answers
115 views

Detecting numbered cards in a stack?

We are attempting to electronically determine which of 10 cards, numbered 1-10, is currently in front of a stack. Initially card 1 is in front. Eventually card 1 will be flipped around to the back ...
2
votes
2answers
164 views

THM3060 RFID reader setup issues

I got the following rfid reader from a colleague https://www.aliexpress.com/item/4000035966273.html?spm=a2g0o.productlist.0.0.4ac14adcZL3H9M&algo_pvid=af835e25-e532-4426-8714-cd80a9871169&...
21
votes
5answers
4k views

Why does low frequency RFID have a short read range?

If I want to get the wavelength of a radio wave, I must divide the speed of light by the frequency? So having a 125 kHz RFID means an estimated 2km wavelength? If its wavelength is 2km long, why ...
9
votes
1answer
4k 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 ...
3
votes
1answer
1k 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 ...
2
votes
2answers
23k views

Can an iphone/android cell phone communicate with RFID?

Is it possible for a cell phone to communicate with an RFID chip? I'm looking for a low-powered solution to turn a device on/off wirelessly, using a cell phone. Example: phone sends signal to RFID ...
5
votes
2answers
4k 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 ...
4
votes
1answer
2k views

UHF RFID Read Ranges

I'm experimenting with UHF RFID. I have a setup that's working but my read range is only 1 - 2 feet. This is the equipment I'm using, it's all quite cheap, I don't mind spending more to increase the ...
3
votes
1answer
3k views

Multiplex 125kHz RFID antenna

I'm looking to follow up on a question (asked by another) that wasn't answered to my satisfaction in another question. RFID Antenna Array I am successfully using the ID Innovations ID-2 chip to read ...
2
votes
2answers
564 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 can go ...
1
vote
2answers
2k views

What factors affect the read distance of NFC chips, and how?

I'm trying to understand how to improve the reading distance of an NFC system. So far, my understanding is that there are a few main factors in the read distance: Size/shape of the antenna on the NFC ...
0
votes
1answer
668 views

How can I find or build a passive RFID tag with a range of 6ft, as well as an associated reader?

I am looking to implement a RFID system that uses trilateration to localize a RFID tag. I have no experience with RFID, and although I have done some basic research, I have no idea where to begin. ...
4
votes
5answers
290 views

Is there a sensor for counting the number of cards in a flipping scorecard? [duplicate]

I have a stack of cards and want to know how many cards are in the stack at any given time. Any thoughts on how I might be able to do this? Would it be possible for me to put a tag on every card and ...
2
votes
1answer
337 views

Can RFID read stacked cards?

I want to create a project that will read playing cards that have integrated RFID. If I put multiple cards on top of each other will it still be able to determine the stacked cards? what if the cards ...
2
votes
4answers
484 views

How to get a high precision sine wave not available from standard crystal?

I am considering for a RFID transmitter, which just send power with no data. However, my frequency is not standard 13.56MHz not 27.12MHz, it is 27.095MHz. Can I use the block diagram shown above? If ...
2
votes
3answers
2k 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 ...
1
vote
1answer
86 views

Mitigation of dead zones when applying circular polarized antenna

I would like to know if I used a circular polarized (RHCP) antenna inside a metal container as show in the configuration below will it reduce the dead zones, as compared to a linear polarized antenna? ...
1
vote
2answers
2k views

RFID + permanent magnet

A project I'm exploring requires placing a permanent magnet in close proximity to an RFID tag (within a cm or so). Can an RFID tag be read when there's a permanent EM field so close to it?
1
vote
1answer
725 views

RFID chessboard

I want to make a electronic chessboard that detects the position of every piece on the chessboard. So I did some research, and one way would be to put RFID tags under every chess piece. Each tag ...
1
vote
1answer
3k views

How to measure distance from moving object using RFID?

I want to make a project on an anti-collision system using RFID. I'm facing many problems selecting RF reader and tag: the required UHF generator, tags and reader are expensive. Any suggestions on ...
1
vote
2answers
387 views

Passive RFID through objects

I wanted to build a device to track the stuff I have in my bag. I wanted to use passive RFID tags which I would place on my objects. The problem now is that I don't have much experience with RFID ...
1
vote
1answer
91 views

Is it better to use USB A or USB B or RS232 to communicate over long distances? [duplicate]

Similar post As per the previous post (which was 5 years ago), I have a device that has three forms of serial communication. One is an RS232, the other is USB A and finally a USB B. So I have three ...
1
vote
1answer
2k views

What applications use ISO/IEC 14443 Type B?

I bought a MFRC RC522 rfid module for my Arduino Leonardo, after I purchased it I notice it only supports ISO/IEC 14443 Type A, and not Type B. I was curious what applications uses Type B anyways? I ...
0
votes
1answer
200 views

Can I use a RFID reader to check if there is an physical obstacle between it and the tag?

I am trying to create a cheap system that check if there is someone sitting on a chair. I would like to know if there is someway I can configure a RFID reader so it identifies when there are ...
0
votes
1answer
73 views

Which frequency measurement method is more suitable for RF signals from 200MHz to 915MHz?

I need to build embedded circuit, an RF frequency meter (also known as RF frequency counter) to measure frequencies of remote key fobs. The frequency range I need to measure is 200MHz to approximately ...
0
votes
4answers
353 views

Cannot communicate with serial device via an Arduino Nano serial communication

I am trying to communicate with an RFID reader via its serial port. The serial port has an RS232 connector on it. I also want to display the RFID tags ID on a 16x2 LCD screen using an Arduino. I, ...
0
votes
2answers
140 views

How to solder wires onto pins of an RFID chip?

I want to integrate a sensor with NXP's NHS3152 (datasheet). To do this I have to solder the wires onto the pins of the RFID chip. What tools should I buy to do this? What is a good reference to learn ...
0
votes
1answer
63 views

Power calculation from E and H field

I am using gprMax to simulate my design. The design is shown in the picture. It consists of an RFID system inside a steel structure. The transmitting antenna is placed in the middle of the container ...
0
votes
1answer
224 views

RFID reader sensitivity/read range - How does a "hard" ground increase sensitivity/read range?

I'm working with two RFID readers in my circuit and an arduino to control both of them. The whole thing is powered by a very cheap wall-wart Power supply at 12V which is rather noisy to begin with. ...
-1
votes
1answer
143 views

Is this chip still usable?

I tried soldering jumper wires to my 3-D antenna, CAS143-47 and little bit of solder found it's way on the chip's body away from the pads. It was my first attepmt at soldering. It looks ugly and ...