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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Which Mifare specification are these commands from?

I have found an example for sending commands to the RDM8800, the specific NFC IC that I am planning on using. The command set that I am using seems to reference a) system commands b) iso type 14443A ...
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1answer
30 views

Why are there types A and B in ISO 14443?

I'd like to understand why the ISO 14443 standard describes two types of interfaces, type A and type B. This answer talks about competing technologies brought forward by two different companies: ...
-4
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1answer
53 views

passiv RFID or NFC tag with high range [closed]

I am searching the internet for quiete a while now to find out which passiv RFID Tags and which passiv NFC Tags have have the highest read/write distance. I am aksing here because the most information ...
0
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1answer
49 views

Understanding a debit card reader through RFID

I work in the bus industry and today I went to a meeting that gave me an idea for a project. In order to start the project, I need to gather a technical perspective of how the product that I saw in ...
0
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1answer
44 views

Does length of wire to NFC antenna affect ability to read tags?

Most questions regarding NFC antennas pose the question if it's possible in increase the reading area of an antenna. I'm curious: given a fixed size antenna, does increasing the length of wire ...
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0answers
50 views

NFC Reader based project with microcontroller

I'm familiar with NFC technology on the Android side, since I've made several applications with it. I'd like to make a very simple microcontroller based hardware with NFC reader P2P involved for ...
0
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1answer
78 views

Transmitting data over inductive charging coils (or boosting RFID/NFC power supply)

I know that data can be sent over power lines through various different types of modulation - that is as far as my knowledge ends. I have a small D.I.Y. project (a board game) that requires some form ...
1
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1answer
52 views

DESFIRE does not reply to REQA from MFRC522

I'm writing an stm32 driver for the NXP MFRC522 ISO14443A PCD but cannot get it to talk to DESFIRE cards. My code will correctly identify both Mifare Classic (4-byte) and NTAG203F (7-byte) PICCs and ...
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1answer
84 views

Can I replace a 27.12MHZ by a 13.56MHZ Xtal on PN532

I have a prototype of NFC reader which is attached to my Board. But it seem it doesn't work ... the only change I made was the Xtal because I don't find 27.12MHZ. Some people told me I can replace it ...
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1answer
53 views

125kHz RFID and NFC simultaneously

It it possible to have a passive NFC tag and a 125kHz RFID tag back to back in the same holder and not have one interfere with each other, reading one at a time? E.g Detect 125khz RFID tag, read it, ...
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1answer
79 views

How much energy can a RF harvester capture from a mobile phone

Hi Guys, I've wondered if mobile phones were able to transmit energy to RF harvesters. Is there a way to calculate how much energy can be harvested from a standard smart phone today when placed at a ...
3
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1answer
55 views

PN532 not responding using SPI when issuing antenna-related command

I've bought a PN532 v1.3 breakout board, to which I communicate in SPI. I can ask it its firmware number, to which it answers D5 03 32 01 06 07 (PN532 V1.6), which ...
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1answer
77 views

RFID wristband for cashless payments [closed]

Most cashless payment systems using RFID seem to use HF (13.5MHz) tags. My questions are: Why do RFID wristbands used for cashless payments use HF over LF transponders? Some access control ...
1
vote
1answer
112 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
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2answers
62 views

Identification Technique

I'm building a 20cm x 20cm table that is divided into cells, it has 4 rows and 4 columns. There will be different external blocks that have numbers, each block can stand on a single cell, each block ...
-1
votes
1answer
41 views

RFID reader and bluetooth connectivity

Can an RFID reader detect bluetooth device? I downloaded an application called RFID explorer on my phone. The application helps to get read by RFID readers. I switched on the bluetooth on my phone and ...
0
votes
1answer
60 views

NFC - FPGA - TFT Question [closed]

Im working on an idea but am having a problem finding even a starting point for research. The idea is to have images (video) sent over NFC to a NFC connected to FPGA (or something else could do?) and ...
0
votes
1answer
90 views

Read AS3953 NFC EEPROM when the chip is not supplied

I want to read/write AS3953 (NFC chip) through SPI (MSP430) and PCD (Samsung Galaxy S3 Mini). No problem for the first part (through MSP430 SPI). but when I want to read EEPROM values trough PCD, I ...
0
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1answer
246 views

Basic NFC Loop Design on PCB

I'm a college student learning the basics of NFC loop antenna design. As a starting point, I'm trying to design a PCB-based rectangular NFC loop operating at 13.56 MHz, matched to 50Ω. (NFC ...
1
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1answer
114 views

Does the nfc ring work with this rfid reader?

Is the NFC ring compatible with RFID Reader ID-20LA (125 kHz) ? In this stackoverflow question it is saying there are standards, but I cant find out weather the 2 products support any of those ...
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2answers
29 views

UHF RFID communication or something similair

I am trying to develop a proximity logger. Basically I have 2 mobile devices (microcontrollers), when the devices are within a 1-2 meter from each other, they should exchange IDs (a simple integer ...
8
votes
4answers
1k views

Does NFC drain power if tag is attached constantly?

I am not sure if it's a matter of NFC (Near Field Communication) standard or implementation of an NFC reader, but if a passive NFC tag is left attached to a reader, does that constantly drain power ...
2
votes
1answer
2k 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 ...
0
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1answer
182 views

Cheapest Bidirectional NFC With Android Phone

I'm trying to build a handheld device which can communicate bidirectionally with an NFC-enabled Android phone. Generally, the phone will send some arbitrary command, and the handheld would then ...
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votes
1answer
176 views

NFC implementation on fpga

Is it possible to build a NFC transceiver on a FPGA ? If yes what kind of signal conditioning will it require to take data in and out of the FPGA. Basically what size(LUTS) fpga will be able to ...
0
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1answer
379 views

Bluetooth - NFC communcation

I want to build a device that would recieve a NFC TAG and send it via Bluetooth to the Mobile Phone, that has Bluetooth enabled. I am searching for some basic articles or some starting points on how ...
0
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1answer
559 views

Building a NFC extension Antenna

I'm trying to find out how to build a circuit to extend the NFC range. NOT the range from the chip itself, but like following example: I have NFC enabled Tablet that has an built-in NFC chip. I ...
0
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1answer
71 views

RFID and NFC how they work? [closed]

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 ...
0
votes
1answer
233 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 ...
0
votes
1answer
2k 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 ...
1
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1answer
172 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 ...
-1
votes
2answers
116 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 ...
0
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2answers
160 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 ...
3
votes
1answer
595 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 ...
0
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1answer
707 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 ...
4
votes
5answers
6k 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 ...
2
votes
0answers
186 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 ...
2
votes
2answers
370 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 ...
1
vote
1answer
119 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 ...
1
vote
2answers
2k 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: ...
1
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2answers
640 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 ...
6
votes
4answers
3k 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?
2
votes
2answers
4k 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
2k 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 ...
2
votes
2answers
487 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 ...
0
votes
1answer
2k 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
206 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 --- ...
0
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1answer
604 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 ...
4
votes
2answers
2k 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 ...
1
vote
2answers
217 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. ...