Tagged Questions

Near Field Communications - In antennae theory Far Field radiation is that RF energy that gets transmitted, Near Field is the RF energy that typically does not propagate , unless it is intercepted by a special antenna. It is used to transmit signals over short distances without transmitting widely, ...

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1answer
34 views

RFID and NFC how they work? [on hold]

could some one explain me these technologies? I understand the main difference is the strenght of the signal. If im trying to automatically send an alert to any smartphone (able to receibe it) can i ...
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0answers
50 views

How to increase the read range of an active NFC tag?

I want to read a NFC tag at a distance of 1m from my NFC enabled smartphone. Is it possible to do so by enhancing the antenna of the NFC tag (not the one on the phone). Size of the NFC tag is not an ...
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0answers
10 views

RPI ERROR: Unable to open NFC device [migrated]

I am currently following this guide: https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/testing-it-out After completing all the steps - inputting into the console: $ cd examples/ $ sudo ...
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1answer
80 views

Is it possible to extend the reach of a pn532 NFC/RFID shield?

I am working off an Arduino UNO with an AdaFruit pn532 NFC/RFID shield. The goal is to have a shoe box, with a false bottom. Under that false bottom would be my prototype, which hopes to be able to ...
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1answer
83 views

NFC tag interfere with hearing aid device

I want to add NFC tag to hearing aid device for a child to monitor on smartphone (or smatwatch - either carried by children) if the tag is in the range - if not it means that child lost it and I can ...
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2answers
45 views

Multi-antenna extension for NFC

Like many, I am new to this. I am working on a project that would require a short read range over a covered space, like a person's body or table top. Could I make an extended antenna from my smart ...
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2answers
75 views

use RFID ( or what else? ) for a broad distance measurement in 1-2 meter wide area

Let's suppose we have a suitcase containing some RFID tagged objects. With a reader contained in the same box, I periodically poll the content in order to check if something is removed from the ...
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1answer
194 views

MFRC522 on Beaglebone Black

I am trying to get my RC522 to work on the BBB. It works great on my Arduino which is well documented e.g. here or here. My only requirement is to read the serial # of cards which are Mifare S50. I ...
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1answer
210 views

Detect presence of Passive HF/LF RFID TAG with BT 4.0 (NFC not supported) [closed]

Trying to understand if with current capabilities of Bluetooth 4.0 / Smart / BLE, is it possible to detect a passive RFID TAG, within a very short range (less than 5cm). New phones both Android/iOS ...
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3answers
1k views

DIY NFC boosting antenna for a mobile device

I am very new to this. I'm a dentist trying to improve client flow in a busy office. I would like to develop a cheap proof of concept for an NFC enabled client tracking system using a hacked mobile ...
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0answers
80 views

Atmega328 NFC cannot wake

I'm trying to communicate my 328 with DFRobot's NFC Module a while now, but I cannot wake the card. Below is my code, where I use DF's instructions on how to make the card work. I write what card ...
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0answers
107 views

Build or Buy Bluetooth 4.0 BLE Tag [closed]

I am planning to create a mobile application that scans a NFC tag and performs an action based on the unique scan (tap). Because Apple iPhone do not support NFC I am forced to look for an alternate ...
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2answers
98 views

Is it possible to provide security in Passive RFID tags?

I am working on a project, where I am using RFID tags, and RFID reader for some sort of authentications. But after searching for a while, I found that passive RFID tags can be cloned. Is there any ...
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1answer
73 views

RFID distance transmitter

I am looking to have a program which would alert me whenever a certain RFID tag would no longer be read, however I don't want to use NFC since I need the distance to be of at least 50cm+. Is there ...
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0answers
152 views

Can pn532 shield read TI dynamic tags?

I bought NFC shield from Adafruit. I wanted to read TI RF430CL330H dynamic tag with it. Since the tag is ISO14443B standard, I thought using this code from the examples which is for ISO14443A tags ...
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2answers
456 views

Power requirements for NFC (RFID) chip

I'm new to electronics so please bear with me. I'm trying to work out what kind of battery would be required to use with the following chip: ...
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2answers
220 views

How to detect the location of an object placed on a display

First of all, I'm primarily a software guy, so excuse my ignorance in this area. What I am trying to do is detect the position and uniqueness of an object (say a small wooden cube) that is placed on ...
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4answers
436 views

Can I use a NFC ring as an Oyster card?

I've been looking into converting a MIFARE (Oyster card) into a ring. I found this NFC ring on kickstarter, will that work as an Oyster card? Or are they different technologies?
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2answers
2k views

Help with the design of a rectangular loop antenna for the PN532 controller for NFC communication

I am currently designing an NFC reader in the context of my PhD thesis. The NFC reader will use a PN532 chip from NXP (which is one of the requirements of my circuit). I plan to draw a rectangular ...
4
votes
1answer
1k views

Can the NFC antenna of smart phone read signals from (active) RFID tags/transmitters

Can the NFC antenna of mobile phone such as the Galaxy S4 or iPhone in addition to their NFC functionality, also be used to read signals from (active) RFID tags/transmitters e.g. from 20ft away not ...
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1answer
220 views

Developing a new System… confused between RFID or NFC.. just a few questions

I know NFC is the new in thing and it may go a long way specially w/ payment systems. I'm new to this wireless tags thing. I'm a PHP applications developer and I'm gona do a few applications like ...
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0answers
450 views

Senior project using RFID technology - is this feasible?

The project is to implement object localization using RFID technology. The idea is to have objects tagged with RFID tags and have one (or several) readers that will locate the objects' position. The ...
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1answer
843 views

Howto use/shield NFC/RFID Sticker on back of iPhone 5? [closed]

I want to stick a RFID sticker on the back of an iPhone 5 (between a case and the iPhones back to be precise). The sticker is an Mifare DESFire EV1 sticker, in case that matters. Problem is, the tag ...
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0answers
119 views

“Remote” NFC Antenna

I'm trying to put together a Near Field sensor where the pcb antenna can be remotely installed (about 2 ft away). I've looked at NXP PNxxx design here --- ...
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1answer
363 views

PN512 not starting?

I got a PN512 IC (NFC controller from NXP) interfacing with a MCU over SPI and ChibiOS. Everything seems to be working fine, i can read the registers and they returned value matches with the reset ...
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2answers
1k views

Help with PN512 basic PCB antenna design

I'm designing a small board that integrate a PN512 IC along with other components (MCU, etc). I need to build a proof-of-concept device for a presentation with the suit people and everything is ready ...
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2answers
168 views

What technique/sensor can I use to recognized tagged objects thrown onto a surface? [closed]

I am trying to implement a concept for somebody else. Basically, I want to create a smart surface. I want to create a surface I can throw one or more tagged objects on that should all be recognized. ...
2
votes
1answer
323 views

Compatibility between Arduino ADK and NFC Shield

I have an Arduino Mega2560 ref3 ADK which is connect to Android. I also have a seeed studio NFC shield connected to it. The problem is that if I try to initialise the AndroidAccessory library and ...
3
votes
1answer
11k 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 ...
0
votes
1answer
456 views

Pinout for an SMA Connector

I'm trying to connect my antenna to my PN532 chip using an SMA connector but I'm not sure about the pinout. I'm using the following as my sample schematic and I want to use the following SMA connector ...
1
vote
1answer
795 views

Is it possible to shortcircuit/damage an EMV card without a current source?

I've recently was accosted^H^H^H^H^H^H^H^ sorry, was gifted by the bank with contactless debit cards. They're standard EMV ("chip and PIN") cards apart from that. I've decided to buy "card ...
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vote
1answer
504 views

Providing power to additional load (PN532 Board)

SETUP: I've put together a board comprised of: 24 V DC Supply voltage connected to 60 Ohm (10 W) Resistor that is in series with a LM7805C (5V Regulator). The LM7805C has a .33 uF cap on the Vin ...
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votes
1answer
864 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 ...
2
votes
1answer
137 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 ...
5
votes
5answers
8k 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 ...
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votes
6answers
1k views

Detecting object placement on a grid

I am working on an Android ADK project. I am looking for a way to detect the locations of chess pieces on a board (8x8). I was looking at things like NFC but It looks too expensive. Is there a ...
3
votes
2answers
396 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!
3
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2answers
492 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 ...
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0answers
378 views

Will NXP NFC PN532 work connected to an antenna grid that is multiplexed?

Can I operate say 36 different antenna monitoring tags against a grid of small 2" x 2" squares by simply connecting the antenna to something like the NXP NFC PN532 through a multiplexer (N-to-1 ...
2
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3answers
448 views

What's so special in “near field” and is it used in Near Field Communication?

There's this commercial technology called Near Field Communication. Turns out there're also so-called near and far field. Near field (in near and far field) is special in that electrical and magnetic ...
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1answer
596 views

Visa payWave, MasterCard PayPass and ExpressPay, NFC and RFID

Since all those technologies use RFID contactless smart card and EMV, are they compatible? Is contact-less Visa card compatible with the Mastercard system? Are the systems compatible with NFC? I.e. ...
2
votes
4answers
421 views

How does Near Field Communication protect from unwanted long-distance communication?

According to Wikipedia Near Field Communication is intended for short-distance communication - something like less than a meter. I wonder how could this limitation be enforced? Usually there're these ...
4
votes
3answers
2k views

Where to buy a NFC Transceiver

I'm attempting to build an Arduino-based device that will use NFC to know when my phone is close to it. My phone is a Nexus S, equipped with NFC. I'm looking for what I believe is called an NFC ...
10
votes
2answers
1k views

How to add NFC to a cheap consumer product?

I want to add NFC (Near Field Communication) to a cheap consumer product with an existing microcontroller. I need to be able to pass a chunk of static data to a smartphone. I'd like to be able to ...