Radio Frequency IDentification

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1answer
39 views

Is it possible to multiplex the same frequency (without bandwidth division)?

I have a range of bandwidth (e.g. [865,868] MHz) and more than one RFID tag I'd like to receive information from, over that range. How could I multiplex those ...
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0answers
23 views

NRF24L01+ and NRF24LU1+ Communication - RFID application

I have an RFID application in which tag has NRF24LU1+ and the Reader has NRF24L01+ chip. The Reader is based on STM32F4xx Micro-controller. I have two same Readers which are communicating with ...
0
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1answer
26 views

What does Fujitsu call an “RFID LSI”?

Fujitsu offers ferroelectric RAM modules, including in "RFID LSI" format. I have no idea what those are, and the engrish documentation doesn't help at all.
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0answers
36 views

Is it possible to read RFID card and trasmit the data to Android device using bluetooth transceiver without using any microcontroller?

My aim is to read RFID card and have the data on android device using bluetooth. Devices I am thinking of use are 1. RDM6300 RFID Module - RFID Reader 2. Bluetooth Transceiver Module Do suggest any ...
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43 views

NRF24l01 as Active RFID?

I just need little advice. Thinking about Swimming Pool Lap Counter. It might sound silly, but for me it should be very convenient to have receiver with big LED display which shows number of passed ...
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1answer
38 views

Indoor Location Tracker for Automated Cameraman

I am new to Electronic Hardware, but have prior experience with Custom built web applications. Recently purchased Raspberry Pi and have been thinking of different projects to make with it as the ...
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1answer
53 views

What are the options for short range under six inches 3D multi point location tracking?

What methods exist to track the position of points relative to each other. Particularly what methods allow the determination of the distance between up to ten points at once. The distance ...
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0answers
68 views

Detecting the distance of my dog to the food bowl

When one of my dogs sneaks to another dog's food bowl, I want to be notified so I can stop it. I have EZ430-RF2500 (msp430) development kit. Is it suitable for such project? I also have Arduino so I ...
0
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1answer
47 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 ...
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3answers
690 views

Why can't you put a plane under a trace antenna?

I'm working with RFID for the first time. All the app notes I've read show a separate region of PCB allocated for the trace antenna, with no planes above/below. I want to understand why this is, and ...
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1answer
77 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
39 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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2answers
95 views

What technology does smart keys for car use? [closed]

How does a smart key know that the driver is in the car?
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0answers
53 views

Crystal routing in layout

We started production for a project with RFID reader (13.56Mhz) which have an external crystal of 13.56Mhz. The layout was designed by a Chinese design house which I'm afraid that did a small mistake ...
0
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1answer
59 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 ...
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5answers
98 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 ...
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0answers
43 views

MFRC522 Interrupt Handling

I am working on a project that reads RFID tags/cards by using MSP430 and MFRC522 module. Module communicates with MSP430 via SPI. It detects cards and reads serial number with polling properly. ...
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0answers
29 views

MOS parallel to antenna - antenna clamp, antenna modulator

I would like to understand the following thing: in RFID passive circuits there are MOS transistors, which work as a clamp or a modulator. These transistors are in parallel to antenna. Drain is ...
2
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1answer
62 views

RF switches for RFID HF 13.56Mhz

I would like to use 1 RFID reader (13.56Mhz, protocol iso14443a) with 2 antennas in a way that I can recognize the location of the tags- if they stand on antenna #1 or #2. For that, I tried to use 2 ...
0
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1answer
62 views

How to track the 3d movement of a small animal in a 4x4x8 meter cage?

I need to track the movement of a small animal (60 grams) in a cage which contains plants, shelter, branches and so on. I need all three coordinates in real time. Spatial resolution should should not ...
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0answers
30 views

Serial muxing RFID units

I want to mux up to 8 RFID units, the RFID units auto sends information (13 bytes) and uses RS232 interface. I will use a arduino to mux the signals and forward it to the main computer. I'm using ...
0
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1answer
44 views

mifare ultralight c

i am tired of searching information about this and finding nothing about it, so i am here looking for some professional help. I wanna know if a RFID mifare ultralight c chip can be connected to the ...
5
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1answer
198 views

How to identify unknown component

I've recently got myself a bus pirate to read an EEPROM which is labelled fm24c32a since that's the only thing I could recognize on the board (the IC was covered by a blob). I managed to identify a ...
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0answers
99 views

Tuning ID-3LA RFID antenna using oscilloscope

I've got an ID-3LA chip wired up to an arduino and an antenna I wound myself with 30 AWG magnet wire. It works, but I've read that I should be able to tune the antenna by connecting it to an ...
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1answer
70 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 ...
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2answers
94 views

Long range RFID [closed]

Do you know which technology can have better range with and without battery assitance than RFID? This is for a school project, we are looking for ways to detect crab traps lost in the sea. We ...
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2answers
60 views

RFID reader antenna with 2 series capacitors - what do they stand for?

I have found a RFID antenna "ready to use with enclosure". However, it has a coil in series with 2 3.3nf 50V capacitors. It doesn't work with my cheap RFID reader circuit (HZ-1050); it only works if ...
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1answer
72 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 ...
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2answers
88 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 ...
1
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1answer
153 views

How to program USB RFID reader/writer module?

I bought an USB RFID reader/writer module from local store, it is not well known and branded, It connect to computer with USB port , and i want to write a program for it in Linux Ubuntu. I find out ...
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2answers
60 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 ...
0
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1answer
82 views

Can an MFRC500 read a 125khz RFID card?

I'd appreciate a clear explanation on: 1) If RFID readers of one frequency (like 13mhz MFRC500) can read other/lower frequency RFID cards (like cheap 125 khz cards)... 2) If it's possible to build a ...
0
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1answer
202 views

Passive RFID with small size, light, cheap and range in meters for a reader

I'm a software guy so a bit on deep waters here so I thought I'd ask here. :-) I'd like to understand if it is possible to have an RFID tag with the following properties: weight: a few grams, size: ...
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2answers
87 views

UHF RFID enter/leave detection

I want to create a kit which can detect if a person is entering or leaving a room. During my research I decided to use RFID UHF technology. The kit's content: Two antennas placed next to each other ...
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1answer
34 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 ...
2
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2answers
303 views

Wireless data exchange up to 2 bytes/s

I would like to set up communication between two Arduinos with a distance of 20 cm, but not more than 40 cm. I looked for an RFID solution, and I found a lot of PCBs which can be used to ...
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41 views

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 ...
0
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1answer
64 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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0answers
68 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 ...
2
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3answers
161 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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0answers
78 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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0answers
33 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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2answers
106 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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0answers
53 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 ...
5
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2answers
75 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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2answers
100 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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1answer
63 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 ...
0
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1answer
54 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
120 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 ...
1
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1answer
79 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 ...