Radio Frequency IDentification

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Why does this smart card use antenna with different space between turns along different sides?

I've extracted and zoomed to 400 percent parts of image from this post. The original image features the inner parts of Visa PayWave enabled smart card. Here're card corners zoomed to 400 percent so ...
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31 views

ANT-MMCX and Microstripe line and UHF RFID module circuit designing

Below, you see the only schematic of a 6 pages-datasheet of an UHF RFID module (working frequency = 840...930 MHz): There are three questions: What is that ANT-MMCX? I search it in Google and I ...
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20 views

Omnikey reader for smart card

I have omnikey 5321 contact and contact less reader. I have installed web bench for detection of cards and tested both contact and contact less cards, and I'm able to get UID and ATR from card. ...
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36 views

How to communicate with RLM100 UHF RFID module?

I have an RLM100 UHF RFID module. I searched a lot, but I didn't found anything useful that explain how I can use this module. I mean the only thing that I understand so far it that this module use ...
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18 views

RFID max speed for vehicle recognition

I want to track vehicles using RFID (in some reasons I don't like to do this using other technologies). I want to know: 1- Do high speeds affect in recognition? 2- if there is a max speed for ...
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3answers
112 views

What are the basics I need to know to power LEDs with RF at a range of 30 feet?

I would like to light up a path in the woods with hundreds of LEDs using RF. The idea is that I would carry a RF transmitter powerful enough to light LEDs. As I approach the LEDs would get brighter, ...
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36 views

HF RFID Impedance Matching

I come from a software background and I am learning about hardware. I built a simple arduino based bread board circuit that interfaces with a Skyetek M1-mini HF RFID module. I have had success using ...
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24 views

Do RFID-shielding wallets protect against all variants of RFID coupling (even magnetic)?

I have been thinking about getting some kind of RFID-shielding wallet or a set of sleeves for some of my credit cards. Now from what I have seen there are different types of RFID coupling in use, ...
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53 views

Why is a receiving circuit in e.g. RFID made resonant with a parallel capacitance instead of a series capacitance?

Take for example the schematic below of a inductive receiving circuit in RFID, where we want to maximize the voltage over the load resistor R4 (R3 is the resistance of the inductive coil, and the ...
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43 views

What's the purpose of these peninsula-like areas in this smart card circuit?

Here's a scan of a stripped MIFARE Ultralight smart card. Note the underlined peninsula-like areas. They are simply connected from one end to the antenna track. They don't look like a patch antenna ...
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69 views

Why is outer turn of this smart card antenna wider than the other turns?

Here's a scan of a stripped MIFARE Ultralight smart card. Most of the wiring is the antenna which effectively consists of a single spiral track. The outer spiral turn clearly is a bit wider than the ...
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31 views

RC522 Reads card but not tag

Dear Fellow Engineers, I have just recieved two RC522 modules from eBay, both of them came with a card and a tag. Both of them read the cards just fine with miguelbalboa's library ...
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32 views

Use of RFID or suitable alternative to remotely communicate change in system state

I have a physical system which is dispersed over about 20-30 metres cubed and at random points within this space there are electronic nodes which have single binary outputs. I want to monitor every ...
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1answer
36 views

In RFID, are there tag modules that give the user a choice of different outputs?

I look for an RFID tag that gives you the option to 'choose the output'. For example, you want to choose an RFID-output from a list of X possible outputs using a multi-directional switch with X ...
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2answers
47 views

Recommendation for low cost RFID receiver (approx 0.5 meter range)

I am looking to build a low power, short distance identification system. The distance would be around 0.5 meters. I've been looking at RFID, and it looks like the perfect solution. I've been playing ...
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40 views

NFC/RFID Broadcasting

I have been looking around NFC and RFID and right now it seems like all you can do is "program" a tag and then read it. I was wondering if it would be possible to Broadcast what the tag would be and ...
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34 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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54 views

TRF7970A - (RFID reader) No field output?

Quite sure it's a hardware bug, going to replace the chips 21-4-2015... We've got two 'identical' set-ups with the same code on it... but they both act different... (None works) I'm currently working ...
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66 views

How to send the RC522 RFID reader into sleep mode?

I'm trying to get the power consumption of a MFRC522 RFID module down, currently while running it consumes about 4mA. There should be a way to put it into sleep mode, I just can't find any ...
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37 views

Question about Frequency Travel Distance

I've a question regarding the Radio Spectrum and RFID which is confusing to me. From what i learnt about RFID; Low Frequency (125kHz) will have shorter range but UHF will have the longest range. ...
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1answer
103 views

FCC certification for nrf24l01+

Is nrf24l01+ from Nordic Semiconductors FCC certified ? It is hard to find out from their datasheet whether FCC approved ? Is it FCC approved ? If it is approved and I use it in my PCB and control it ...
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106 views

RFID race timing system using raspberry Pi?

I would like to build a race timing system using UHF RFID passive tags. I have seen self build systems described as per the following link which is being used in races with apparent success: ...
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230 views

RFID RC522 with AVR

I'm trying to communicate with RC522 Rfid board with AVR Atmega32L. My mcu running at 3.3V, so, the signals are familiar with RC522 module. Is there a library with native C, (NOT arduino code) for ...
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56 views

RFID tech for PCB identification?

I am looking to use a soldered on RFID "thing" for board ID. The requirements are: a) Cheap b) No power supply needed c) Hand held reader/writer d) In place programming after PCB manufacture Any ...
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2answers
24 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 ...
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80 views

Characterization of Power Harvester

I have chosen a power harvester to power a few things as part of a wireless system. This one is the one I have and it seems to be operational: http://www.powercastco.com/PDF/P2110-datasheet.pdf ...
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58 views

HF RFID 13.56MHz Interference from WiFi/BLE 2.45GHz?

If a Wifi/BLE antenna were placed within a multicoil loop antenna for 13.56MHz HF RFID, would there be significant crosstalk/interference?
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110 views

Question about RFID Reader Frequency and RFID Tags

I'm researching about RFID Technology as i'm trying to build a RFID Reader using an Arduino and/or Raspberry Pi which i been trying to do so for a month however with no avail. So i been reading up as ...
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51 views

Where is the memory inside this RFID tag

I dissected a RFID tag (Omni-ID). What I found is basically two components (wrapped in white plastic), a metal strip , and PCB having a wire: I want to understand where is the memory to store ...
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1answer
89 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 ...
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204 views

RFID card reader : wiegand 26 bits but UID tag 40 bits?

I am working on a project of access control with a Raspberry Pi. I want to buy a RFID card reader (125 khz) and tags. After a lot of research on the web, I found out that the most common connection ...
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67 views

Can I connect RFID tag to a microprocessor?

Is it possible to connect an passive RFID tag to a microprocessor and functions as a receiver? I am new in this,so I need abit of advice on how to do. I've heard alot that it is possible but there is ...
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90 views

Proximity detection with rfid

I am wondering if anybody has ideas for developing an (Arduino?) system that would use RFID to log occurrences when two people are in close proximity to each other (e.g., <= 1 meter). Ideally, I ...
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122 views

Finding an RFID Reader that reads at 1 meter

I'm looking for some sort of RFID reader that can pick up RFID tags up to a meter away. I was under the impression that this fell under the category of ISO-15693, but I have not found an actual reader ...
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50 views

RFID interfacing with atmega162 problem

I have interfaced RFID and atmega162 as in picture , but I am getting garbage with blank spaces, hypens on lcd , please see my code and tell me whats could be the problem, Hoping for your help. ...
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61 views

RFId interfacing with atmega162

I am new to programming, I have created a schematic of my project I am not sure it would work or not. I have RFID 125khz - Model no RFID6300. Do this module require MAX232 to be used in between ...
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97 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. ...
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107 views

Arduino Multiplex RFID

I want to build an Arduino based chessboard using Multiplex RFID to identify pieces. I have already build a version using reed switches see chess.fortherapy.co.uk . Having 64 readers would be too ...
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150 views

Can RFID technologies replace GPS for location/positioning applications? [closed]

I'm looking into a hobby project that would require a central interrogation device querying other devices for their location, as well as other metrics. This central device needs to know exactly where ...
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2answers
44 views

Identifying multipleDC trains on the same track?

I'm modifying my DC train system to control the trains from a small chip onboard (arduino or spark core) and I want the trains to be able to know where they are and the controller to know where they ...
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1answer
28 views

UFH reader Gen2 and tag G2iM+

I'm planning to build homemade UHF reader but I'm a little confused. I've selected reader IC and tag IC. The reader used EPC Gen2 communication protocol. I really like NXP tag IC. But they use ...
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87 views

Increasing the range of a UHF RFID reader

Okay, so I've got an UHFReader18 UHF RFID Reader from China, which can be seen here: http://www.aliexpress.com/store/product/Popular-800mm-UHF-RFID-Desktop-Reader-6B-6C/413622_598715812.html. The ...
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50 views

How to detect several agents within a radius, what is the best and easiest way to do it?

I have a room with 30 objects which may or not be present, and I want to be able to detect which objects are in the room. My first idea was to attach a RFID tag to each one of these objects and have ...
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97 views

Looking for datasheet on 2 ST Micro ICs re: RFID

I have an RFID reader as a separate PCB (purchased from seeedstudio: item) of which I wish to incorporate the key ICs into my own PCB. Apart from a 16Mhz crystal and the necessary caps and resistors, ...
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4answers
135 views

Determining distance between wireless sensors - sailing project

I'm looking for a solution which will allow me to determine the distance between two points, one of which is static and the other not. It's part of a project I'm working on which will involve the ...
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50 views

Measuring Stride distance wirelessly

I'm trying to fit two sensors in a shoe each (such that each shoe has one sensor). their purpose being to calculate the stride length of a person, as a person takes a stride, the distance between two ...
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64 views

Set RFID frequency

I hope someone can help me with a doubt about the way RFID works, regarding communication with RFID tags. I am working with a Motorola FX7400 reader, I know it works in a frequency range (902-928 ...
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141 views

RFID tags inside metal items?

Is it possible to use an RFID tag inside a stainless steel enclosure? I am looking for a way to uniquely and easily identify a sensor. An alternative possibility is a laser engraved bar code.
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448 views

Getting to work RFID-RC522 reader / writer with Teensy 3.1

I am trying to use the RFID-RC522 reader / writer together with a Teensy 3.1. I cannot get it to work. I always get the error: MFRC522 Software Version: 0x0 (unknown) WARNING: Communication ...
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103 views

Need help isolating source of interference

I'm pretty new to electronics, but have been successfully working with a Spark Core (www.spark.io) and some simple drivers/circuits for now. That said, I've run into a problem. I have a Spark Core ...