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Questions tagged [rfid]

Radio Frequency IDentification

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37 views

Can UHF rfid pass thorugh few layers of clothes in a smart shopping system?

I am working on a smart shopping system and would like to know if a UHF rfid signal can pass through few layers of clothes in a bag as multiple clothes would be present in a bag and system has to ...
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20 views

In the eyes of an RFID reader, is there any difference between the E4100 and E4305 125 kHz chip?

I'm looking to copy an RFID fob. I wasn't sure what frequency it is, but after taking apart one similar to the one I want to copy and checking the chip, on it was written "4100", which from my ...
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1answer
47 views

Alternative wireless technology for passive RFID tags

I am working on a project where I have 3 boxes and a RFID reader (mfrc522) attached at the bottom of each box. I keep my wallet/keys/etc in these boxes and a LCD screen displays what is in each box ...
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2answers
100 views

Can you find what RFID frequency is used in a tag and then edit it? [on hold]

A short background: my brother has membership at a gym that uses small RFID tags ("near field", I suppose, as you need to tap them against the spinning gate in order to open it) and after changing his ...
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1answer
30 views

SMPS Transformer affect RFID card

In my circuit, RFID card sometimes works sometimes not. it depends on how I put the card on RFID receiver. Usually it does not work when I put around the smps transformer. I guess SMPS transformer ...
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0answers
30 views

“MH” Markings on a MFRC522 RFID reader

I just bough 2 MFRC522 RFID reader from a different store. Both of them work well to read a standard 13.56 Mhz tags. However, one of them have "MH" marking while the other doesnt. The one with MH ...
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1answer
28 views

Passive RFID tag with push button [closed]

how can I install a small push button (Tactile Switch) to a cheap passive RFID tag, so that the button pressed will be detected by a RFID reader? I assume to cut open the IC circuit and install a push ...
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118 views

How to read an unknown RFID tag

So I need to read this RFID tag. I know that it works and I know it uses 13.56 MHz. Still I couldn't read it with available mobile applications. The same when I used Arduino with RFID readers. But I ...
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17 views

RFID Collision: assume there are 3 readers and multiple tags

In this example, there are two readers activated (dark green: interrogation range; light green: interference range). We can see that there is a tag (say tag A) in the interrogation range of a reader, ...
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1answer
63 views

Increase range of 125khz RFID Reader

Currently the range for my 125khz RFID reader is about 4 centimeters. I have opened it like below: Is there any way to increase the range to around 10 to 20 centimeters? For example, increasing the ...
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32 views

RFID Key Fob Reader SIEMENS From Car 12 Volt to USB

I'am trying to transform an Rfid reader from Car to usb. From the wiring Page 77 on Renault-Megane-II-Service-Manual I can identify the power wire 2 and ground wire 4 and I know the reader receive a ...
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1answer
37 views

Can I control/read an RFID reader with an Android device or do I have to put an Arduino board between the two? [closed]

I want to develop and Android app the reads RFID tags. I am wondering if I can control the RFID reader directly with an Android device or do I have to put an Arduino board between the two. The RFID ...
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2answers
42 views

Passive RFID tag - link between size of antenna and read range (detailed)?

It is often said that the smaller the tag, the shorter the read range. Could somebody explain more technically in terms of radio engineering? For instance: why the Hitachi's U chip cannot achieve a ...
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1answer
14 views

RFID Tag, Xbee or Bluetooth Module

I am just trying to detect if an object is within 7-10 feet from my phone. What device would you recommend? I don't care where it is or anything I just need a way of detecting that that device is at ...
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0answers
25 views

RFID reader antenna matching

I am trying to connect a RFID reader chip to an W3113 antenna on PCB. As said in datasheets, the antenna pin of the reader chip has internal 50 ohm impedance and antenna W3113 also has 50 ohm ...
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0answers
51 views

Servo sometimes freezes when used with another servo and MFRC522 RFID reader

I have looked, Googled and researched all over by now and I have not been able to find anyone experiencing a similar issue to mine, so I thought now would be the time to ask my own question on SE. ...
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1answer
62 views

Repairing an RFID antenna? [closed]

I have an RFID antenna that seems to be on a custom PCB. The issue I have is that the antenna on one side works fine, but the other side does not. I'm not sure if it is even possible or worthwhile to ...
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0answers
35 views

Power consumption of RFID vs SD card

I am working on enhancing security of data on electronic passports using homomorphic cryptography. Obstacles I am facing in application of the solution I have came up with relate directly to available ...
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0answers
41 views

Proximity tracking using RFID

I would like to build a proximity tracking system. A a central unit small enough to fit on a key chain or necklace that would be able to detect as soon as a tagged object is farther away than a dozen ...
1
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1answer
32 views

RC522 board not working, red led is on

I have a RFID RC522 board that was working perfectly, until by mistake I tried to write it with a phone as if it was a RFID tag and now it stopped working, in the way that its led still turns on but ...
0
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1answer
46 views

What is a solution to representing bits physically? (on a cartridge, to be read by the cartridge holder… like a printer)

I am trying to recreate the sort of microchips that are on printer cartridges so that I can make cartridges that can have their data programmed and read? I only need to store 8 bits, so I was thinking ...
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74 views

Arduino NANO + MFRC522 + SD Card Module + RTC System

This might seem an old question. However quite recently my professor has assigned a project to me to develop a Attendance-cum-Access System for his Lab. The problem Statement is: "Develop a Arduino ...
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91 views

STM32F4 SPI interface MFRC522 Overrun problem

I have a problem regarding SPI communication between MF RC522 RFID reader and STM32F4 Discovery board. I'm hoping some of you have much more experience regarding this topic. So, basically I want to ...
2
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1answer
278 views

On board 13.56MHz RFID antenna design

I recently stumbled upon a two-in-one NFC key designed by N-O-D-E and was astonished. Although its original purpose is for security, I love the idea of using tact ...
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1answer
169 views

AVR ATmega328 with DWM1000

I recently asked about this over in the Arduino stack, but it was a broad question, and I have made progress and narrowed down the issues. I have two Arduino Nano's, each attached to a DWM1000. This ...
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20 views

Designing NFC/RFID PCB

I am building a prototype for a wireless medical sensor, and I use an Xbee for the communication between the sensor and the controller. My problem is pairing. The sensor is about the size of a ...
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27 views

Passive RFID for live tracking?

Is there a way if I have a paddock 2 km by 2 km I can find the location of my livestock, essentially live tracking their movement? I've thought of possibly giving them a passive RFID tag with ...
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1answer
37 views

Protection against EMI for an RFID reader

I've designed a base board for a Velleman VMA405 (13.56 MHz) RFID reader based on MFRC522 IC. But, due to interference from the base board (I'm assuming the oscillator), the reading range is limited ...
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0answers
23 views

CR95HF as tag using ISO15693

Can I use CR95HF NFC module as the tag! CR95HF+MCU(Arduino) will send the data to Mobile NFC reader. Can I use like this?
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0answers
11 views

Is writing success increased by using shorter EPC on RFID tags?

I am writing and reading EPCs (Electronic Product Code) on small RFID tags (3mm diameter), and writing or reading can be challenging (writing often fails when my hand shakes, possibly because the tag ...
3
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1answer
102 views

Anti-collision Capabilities of MFRC522

I'm a Computer Engineering student, and my full knowledge of RFIDs is limited to the research I have conducted thus far (mainly using this site). As such, there are still some general concerns I have ...
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35 views

Are there UHF RFID antennas with entirely different azimuth and elevation?

To improve UHF RFID reader's accuracy, I want antenna that has long, narrow reading field. So it needs to be directional and have vastly different azimuth and elevation. I stumbled upon few articles, ...
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2answers
43 views

How many clock impulses can a passive RFID get in 1 radio signal?Does it even have a CPU?

From what I've found so far, when scanning multiple passive RFID tags at once, collisions will occur so some collision avoidance algorithms like pure aloha and slotted aloha are probably used.What I ...
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1answer
130 views

Where is UNIQUE 125kHz protocol specified?

I am working on a RFID reader project and I can't find 125kHz UNIQUE tag specification (like listed in this TWN4 reader spec). I could easily find the datasheets for EM4100, EM4200, EM4102 tags. One ...
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4answers
259 views

RFID protective case metal selection

There are various RFID tags that are designed to work in close proximity to metal but generally they hope for free space or at least limited loading in close proximity. As a work around for RFID tag ...
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1answer
65 views

Understand RFID credit card protection case

My parents bought credit card case which protects against RFID sniffing (aluminium foil but only on one side of the case), i was skeptical because i thought it would work only on one side. So i got ...
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30 views

is an RFID smart enough to know when to allow itself to be rewritten by id?

i am still in the thinking phase of my project for RFID tags within the bibs that runners wear. i am considering tracking their times through timing way points. if two RFID's are within writing range ...
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1answer
43 views

Is passive RFID range limited by the activation signal or the reflected signal?

In other words, at the end of a tag's read range, does the read fail because the tag isn't activated or because the tag is activated but the return signal can't be decoded by the reader? I'm concerned ...
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1answer
68 views

What device can I use to duplicate a MIFARE ISO 14443A (13.54 MHz) card? [duplicate]

I'm not familiar with how these devices work. I'm looking to duplicate an ID card for ease of use and this is all the information I can find on it: MIFARE ISO 14443A (13.54 MHz) So, is there a ...
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27 views

Looking for explanation or documentation on writing blank RFID Tags

How does hardware like this write to blank RFID tags? I've been searching for hours and can't seem to find any sort of documentation or explanation on how this process is accomplished. Am I just ...
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2answers
47 views

Will put a metallic plate behind an RFID antenna change the readings?

I have an RFID antenna that has been delivered with a flat metallic plate glued to its back. I don't know much about this antenna it arrived without any documentation, it is square and can read tags ...
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1answer
80 views

PIC18F4550 and Sparkfun RFID Starter Kit with ID-12LA RFID Module, TAG Reading Problem

Recently I bought a SparkFun RFID Starter Kit with ID-12LA RFID Module. Similar to the one in the following Link: https://learn.sparkfun.com/tutorials/sparkfun-rfid-starter-kit-hookup-guide. I tried ...
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1answer
274 views

Can RFID work through metal?

Basically, is there any way to fully encapsulate an RFIF tag in metal and still have it working? Maybe by using the metal as part of the antenna? Low frequency RFID eg 100kHz? Material - Platinum. ...
0
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1answer
58 views

Will a 30cm antenna read Pet RFID chips over more than a few cm?

I'd like to detect my cat at different locations, but I don't want the cat to walk through a tunnel like the sureflap products, which I have both the RFID-reading feeder and door. If I make a say ...
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1answer
180 views

Will a cheap RFID reader work behind a 2mm aluminium sheet?

I'm building a information contact panel that will serve as a point of communication between employees and their company. Part of this process involves putting an ID card to the panel, so it can be '...
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0answers
206 views

“MFRC522_REG_STATUS2” register is always zero - stm32 Rc522 RFID Authentication

I've been working on the only library support available online for the MFRC522 RFID reader for Stm32 microcontrollers. I have downloaded the library from https://phanquocdat.wordpress.com/2015/09/15/...
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1answer
60 views

RFID (or other) - Proximity Detector

I am trying to detect how often 2 animals 'interact'. Say I have 4 cats, I am trying to work out how often each of the cats interact with each other. I have considered using RFID tags attached to ...
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2answers
433 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 ...
3
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1answer
233 views

Decoding waveform from RFID 125 khz reader

I've recently bought a chinese reader for EM4100 and compatible cards: it has an USB to UART converter to get commands from the software and an STM8S10 MCU responsible for the RFID comunication. I ...
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0answers
55 views

Unable to write to block higher than 0x07 on Mifare Ultralight tag

I'm working with a Mifare Ultralight tag (NOT Ultralight C) and I'm unable to write on block higher than 0x07. The tag is not locked (08 00 lock bits). Proxmark3 (...