Radio Frequency IDentification

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1answer
35 views

How to find/build a simple receiver for 12-15MHz radio frequency?

I am looking to buy or build a RF receiver sensitive to 12-15MHz. I can detect these frequencies with an expensive table-top radio spectrum analyzer for testing, but for operation need to have an ...
1
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0answers
6 views

How construct MISO byte order with SPI interface [migrated]

I have a raspberry Pi 3, model B. I have an RFID-RC522 hooked up to it using SPI. I want to read from it, raspi being master device, RFID being slave(MISO). I am struggling to construct the correct ...
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1answer
36 views

Alternatives to RFID - RUBEE

Since RFID tag reading has poor performance in adverse weather conditions, I've received advice to use RUBEE. But I could not find it being implemented, nor available on a consumer scale. i.e., RFID ...
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0answers
32 views

Is this a reasonable project? Building a “simple” tag detector using loop antennas and induction

I would like to build something like an RFID reader, minus the digital ID's returned by the tags. The reader antenna would radiate a frequency out, and then stop. It would then listen for the "bounce"...
1
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1answer
28 views

How does an Active RFID transponder tag get activated?

From what I can find on the Internet about active RFID systems, it seems the reader sends out a signal at a certain frequency and if a transponder tag that operates at the same frequency is within ...
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2answers
30 views

Using RFID antenna to read NFC tag

I have a simple question, I want for a school project read NFC tags from a large range, can I use a RFID antenna to read the NFC tag ? I want to know if the RFID antenna is going to work and read the ...
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0answers
49 views

Device to help find my buried well [migrated]

So, I am in need of something that will help me find my buried well cap. Basically I want to attach something small to the end of a steel line and then track with the phone through the ground. I've ...
2
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1answer
69 views

How can I direct an RFID reader to only read in a specific direction?

I'm trying to control the reading direction of an RFID reader, to only read in a specific direction. I made a drawing to exemplify my question. In the image you can see the setup I want to have. The ...
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0answers
24 views

Can I reduce the interference caused by my phone's body to an rfid tag?

I recently got sick of carrying around a massive fob to get into my condo building, so I opened it up and took out the rfid tag. I then taped the tag to the inside of my phone case, and tested whether ...
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1answer
46 views

Externally controlled RFID Tag [duplicate]

I have a project requirement to use open protocol RFID tags to control doors handling of a light rail train (also called a tram in Europe). The application must sync and control 2 different doors: one ...
0
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1answer
59 views

Are the reflected and absorbed components of an antenna actually orthogonal? [closed]

I'm having a discrepancy between mathematics and my gut sense of reality. (Application: trying to figure out how much reflection I'm going to see in my package. I can tweak the CMOS, but I'm stuck ...
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1answer
32 views

How to read all information from 125 khz RFID card? [closed]

We are working on a project, where user should be able to access the application via rfid card and PIN. We have got sample card from client and procured reader from online store, which is following: ...
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2answers
45 views

Interfacing RFID reader module with PC

Sorry it may seem stupid but I think my confusion is drifting me away from the solution so I wanted to ask. I am trying to build a fixed RFID reader. But the project has some other complex work to be ...
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0answers
52 views

how to open a lock using RFID?

I want to use RFID to open a lock with an Arduino and I was searching in the internet about the components that will help me do that. My question is : do I need a servo motor or a relay to open the ...
0
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1answer
22 views

MFRC522 RFID writing personal data

i'm searching for a specific answer about the writing personal data to RFID TAG (mifare 1k). But i could not find anything. Does the chip perforfing a "read back" verification after writing a block? ...
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2answers
49 views

Unique IDs for physical modules added to a circuit

We have different battery packs that can plugged into our circuit, we're wanting to identify exactly which battery pack has been plugged in, but, as ever, in a very low-cost way. I'm thinking RFID ...
0
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1answer
33 views

RFID reader and tag [closed]

In an RFID device, how does the reader send data to interrogate the tag and how does the tag respond with the data stored in it ?
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2answers
89 views

Grounding dc project to clean RF noise

I'm doing a home automation arduino / RFID project and using a 12v DC switch mode power supply to power it. This supply will be plugged in to a wall outlet. The project however will have some ...
0
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1answer
79 views

Electromechancial locks used in a turnstile

I was looking to build a RFID operated turnstile similar to picture below. I will have RFID readers on both ends where the door would open from either end only if the RFID is authenticated on either ...
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1answer
79 views

RFID card number? [closed]

CARD 18 DIGIT NUMBER :- 0009008413 137,29981strong text But one problem is my overall project interfacing done now me try to expand system .how to get card number ? yes i have one ready rfid reader ...
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0answers
105 views

What's the best way to test if an RFID blocking wallet is effective?

I was recently gifted a wallet that alleges to block RFID signals. It's just a normal wallet with an embedded metallic lattice acting as a Faraday cage. Experimentally, it seems to work some of the ...
0
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1answer
67 views

Low output voltage from arduino pins problem

I using RFID module and the project working well but the only problem is low output voltage from arduino pins when i put the card near module. it is about only 2v not 5v. i test other pins but the ...
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1answer
100 views

Safety tips for 350V @ 134kHz

I'm hooking an RFID reader up to an antenna. The reader operates at 134kHz and, due to its resonant circuit design, it can produce up to 350V (peak to peak) across the antenna terminals, with max ...
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1answer
38 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: http:...
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1answer
63 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
59 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 ...
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1answer
68 views

Detecting a Objects in a Box

I want to build a device using an Arduino or similar that would allow me to detect when particular objects were in a box (things like a TV remote for example). My thought was that I could use rfid ...
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3answers
61 views

RFID reader without micro-controller [closed]

I wanted to build a RFID reader without using any micro-controller or chips or Arduino. But everywhere on the internet, I find that these are used in the circuit. Is there any way I can make one ...
0
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1answer
62 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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3answers
146 views

High accuracy wireless triangulation in a small space?

the question pretty much states the basic idea, but here is my use-case; tabletop war-gaming. Optimally I would like to be able to tag each of my “play pieces” with some sort of tag, place a few ...
1
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1answer
65 views

Sharp corners in RFID antennas

I have heard anecdotally that a square HF RFID antenna performs worse than a circular one, but I am struggling to find any articles on why this is the case. I assume there is a charge concentration ...
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1answer
43 views

Replace RFID with external pilot

im my company there is a gate, which can be open with standard RFID card like this is there any why to replace it with external pilot ? How to do it ? EDIT: How do I understand it: when I close ...
-1
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1answer
56 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 ...
0
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1answer
73 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
29 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
103 views

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

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 ...
0
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1answer
156 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
73 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
78 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
126 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 ...
15
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3answers
734 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 ...
0
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1answer
93 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 ...
1
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1answer
70 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
116 views

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

How does a smart key know that the driver is in the car?
0
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1answer
98 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 ...
4
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5answers
128 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 ...
2
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1answer
192 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
77 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 ...
0
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1answer
48 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
326 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 ...