Questions tagged [rfid]

Radio Frequency IDentification

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1answer
139 views

Clarification on amplitude of observed NFC PICC response

I am using a simple pick up coil attached to an oscilloscope (and as pictured a Saleae Logic Pro 16) to monitor the NFC traffic between a reader (PCD) and ISO15693 tag (PICC). The reader is a PN5180 ...
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2answers
37 views

Help with electronic circuit for a bracelet that reads state from rfid tag attached to it and lights up the corresponding LED

I'd like to make a bracelet which has an RFID tag and LEDs inside of it. I made a device (using Arduino and rc522) that will categorise people's bracelets into one of 3 categories when it touches the ...
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1answer
28 views

NFC UID max read count

Documentations indicates a maximum number of read/write of 100 000 cycles for some passive NFC tags (for ex NTAG215, NTAG216, ...) Does this limitation apply if I only read the UID without any writes /...
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51 views

How do I install UHF RFID readers in close proximity?

Greetings people of the internet, I need help... I work for a company that installs and maintains security and access control equipment. Our latest project involved installing UHF tag readers in the ...
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1answer
50 views

Long range RFID for tracking stationary object

I am totally new to the field of RFID, I want to make a device that can track RFID passive antenna in at least 10m radius and if possible 20m radius (just by latency know how far away from the antenna ...
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16 views

PR-ASK architecture and S2LP Transceiver IC

I am trying to understand if there is any way by which I can achieve PR-ASK modulation in the Transceiver IC S2LP from STMicroelectronics. The Transceiver IC supports ASK and OOK modulation. In ASK ...
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2answers
82 views

RFID antenna beam direction and how to control it

I've been working on some RFID stuff lately and I'm wondering if someone could help me understand how the beam direction works? I'm having problems with my RFID reader picking up signals from tags ...
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1answer
95 views

Can an H-bridge drive another bridge?

I'm using a low-frequency RFID IC that handles a bunch of the low-level signal decoding, but I'm hoping to get more range out of it. It has two TX pins (diagram below) that it describes as a "...
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4answers
150 views

Detecting chess pieces on the board

First of all, I have absolutely no experience in electrical engineering, so bear with me. I want to build a chess set in which it can recognize what piece is on which square. Initially, I thought I ...
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2answers
57 views

Pulse Interval Encoding

I am struggling to understand how do I get a pulse interval encoding scheme implemented in terms of hardware. Is there any source of information available explaining the circuit diagram of the same? I ...
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0answers
31 views

How to tell what type of RFID tag?

I have an RFID tag for access to my apartment building that I would like to clone(buying one through strata would be 100s of dollars). I have a proxmark 3 easy and have cloned tags in the past with ...
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33 views

Wiring RS485 - RFID

I am new to using this device, I trying to get the numbering of rfid iclass card with a HID reader (HID® iCLASS SE® R10) via usb converter rs485 (a COM port is generated in windows) I Try with this ...
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62 views

Increase input current in series resonant circuit

I have an antenna/coil for an RFID application that I am resonating with a series capacitor. However, the current remains extremely low and does not agree with the calculated/theoretical values for ...
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32 views

Mifare Classic 1K - Access Keys & Conditions

I am trying to update the access keys and access bits in Mifare Classic 1K card. My goal is to get the below behavior on sector 1 : Put a custom KEY-A. should be able to read / modify it later (after ...
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2answers
64 views

Why did cars switch from infrared key fobs to radio-wave key fobs? [closed]

Is an RFID key fob less likely to have its signal blocked? Or is it longer range? Or can it be made smaller, or cheaper? Also, how do infrared devices generate an infrared signal? With an infrared-...
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1answer
56 views

How much can I cut off an RFID card without breaking it? [closed]

I have an RFID bus pass, and my phone case has an indent on the inside for a magnetic car mount plate. The indent is smaller than the bus pass card by around an inch on all sides. I'm wondering if I ...
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1answer
38 views

RFID System with protected serial number

In RFID Technology, usually there is a reader, and RF tag that contains an unique serial number and optionally storage technology. In the field of access management there are the the fundamentally ...
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0answers
61 views

PCB w/ ESP8266 NodeMCU - Multiple SPI modules not working

I've been working on a project for quite a while now, which involves the ESP8266 NodeMCU (v1.0), as well as two SPI Modules: ENC28J60, and RFID-RC522. With that being said, I encountered a problem ...
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23 views

Maximum Allowed Radiated Continous Wave Power in 61.25GHz ISM Band

I am looking into a possibility for 60GHz energy harvesting for low power sensor nodes and I am little confused about the differences I have found between the US and European regulations related to ...
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43 views

Is access reader need UL approval for US market?

We are a access reader manufacturer outside of US. Do we need to obtain UL approval for our reader in order to sell or install in US?
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1answer
60 views

RFID (13.56MHz) tag properties depending on read distance

In a reader design i experiencing some problems with RFID tags. I've evaluated the different tags, and they all are made equally - the tag size, tag chip type, antenna and antenna geometry are ...
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0answers
154 views

Reading multiple RFID tags at the same time

Hi I've been working on a personal project for which i need to read multiple RFID tags in close proximity, something like 10-20 tags at once, I know RIFD tags can't be actually be read at the same ...
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12 views

RFID (RC522) scans very slowly second time

I am using raspberry pi 3a+ to get the scanned result from the RFID module. The scanning works very fast the first time when the program initiates but my program requires performing a second scan ...
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1answer
31 views

RFID system inductive coupling [closed]

At low or high frequencies the communication between RFID reader and RFID tag is through inductive coupling. Why do we need a transponder? Don't we need only a receiver? And how is the message of the ...
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81 views

NFC communication - CR95HF over 15693 and 14443-A

CR95HF datasheet: https://www.st.com/resource/en/datasheet/cr95hf.pdf Demo board: https://docs.rs-online.com/562c/0900766b811c6bc2.pdf C/C++ library and guide for demo board: https://www.st.com/...
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65 views

RF Antenna 50 ohm controlled impedance design

this is my first time doing RF design and I'm currently using ThingMagic Nano M6E RFID module and in the process of designing a 50ohm impedance circuit/trace from the IC to the antenna. On their ...
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1answer
51 views

How to reduce RFID interference

I am using a MFRC522 RFID reader I have read that it's antenna when in close proximity with metals then interference could be generated. What should be the distance between the antenna and the metal ...
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43 views

Obtaining printed serial number of MIFARE NFC card

I am working on a project that involves MIFARE 1Kclassic cards. The goal is simply to be able to identify each card when scanned based on the printed number on the front of the card. For example, on ...
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1answer
517 views

How to design a large 125kHz loop antenna for long range RFID application?

I am designing a large loop antenna working at 125 kHz. To maximize the range of my system I am aiming for 1m diameter loop antenna with as many turns as I can allocate (e.g. ~100 for 18 AWG). I have ...
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1answer
32 views

RFID Tags quality control

We have mutiple same-sized, same-tech RFID Tags (Mifare Classic), in the Field we have discoverd that some tags are less readable than others. For example, the distance is smaller or it takes more ...
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2answers
66 views

Is my antenna faulty?

I'm trying to build a receiver signal circuit that will operate at 125khz. I'm using this receiver chip and this 125khz antenna. I tried breadboarding: After connecting AS3933's VCC, GND, CS, SCL, SDI,...
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34 views

STM32 Nucleo L432KC + RFID Antenna + OLED power troubleshooting

I am trying to make a simple Low Frequency (125kHz) RFID detector using: STM32 Nucleo L432KC Parallax RFID R/W module Simple I2C OLED 128 x 64 (OLED is normal, it's not drawing high current or ...
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1answer
92 views

How to communicate over long distances (60 m) using serial communication from multiple serial devices connected to my PC

Previous post As per my previous post which involved determining which type of serial connection is appropriate i.e. RS232, or USB. This was clearly RS232. As a follow on post to that question. I have ...
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1answer
91 views

Is it better to use USB A or USB B or RS232 to communicate over long distances? [duplicate]

Similar post As per the previous post (which was 5 years ago), I have a device that has three forms of serial communication. One is an RS232, the other is USB A and finally a USB B. So I have three ...
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1answer
224 views

RFID antenna multiplexer

I am working on a project where I need to use a single RFID reader to read tags from 4 different positions (6 cm apart). It is OK to only read one tag at a time, so I figured an RF-compliant ...
1
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1answer
61 views

Read data from 134kHz tag from a smartphone

Is there a way to configure the NCF reader from a smartphone to read 134kHz tag or is a smartphone able to power up an external reader so it can read the frequency? I need to read from a passive chip (...
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1answer
246 views

Can RFID read stacked cards?

I want to create a project that will read playing cards that have integrated RFID. If I put multiple cards on top of each other will it still be able to determine the stacked cards? what if the cards ...
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37 views

Designing 125 KHz RFID Rectangular Spiral Antenna for FPC

Am trying to design a rectangular loop antenna similar to this paper from Melexis for an HF antenna design, however i want to implement something similar but for 125 KHz rectangular antenna. Now using ...
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1answer
71 views

Which frequency measurement method is more suitable for RF signals from 200MHz to 915MHz?

I need to build embedded circuit, an RF frequency meter (also known as RF frequency counter) to measure frequencies of remote key fobs. The frequency range I need to measure is 200MHz to approximately ...
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2answers
130 views

At what range can I transmit with this antenna?

I would like to transmit data at 125 kHz frequency. I'm wondering what is the realistical transmission distance that can be achieved with this antenna: It's a rectangle shaped 9x12cm coil antenna. ...
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68 views

Snubbing LC oscillation

I have a series LC resonant circuit L = 44.4mH C = 36.5pF fr = 125kHz. It is LF RFID antenna. The LC circuit is powered by an H-bridge with MOSFET transistors. 125kHz carrier frequency, 1kHz ...
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0answers
36 views

Using a far field UHF RFID in the near field range

I have a 902 MHz to 928 MHz UHF 8dBi far-field RFID antenna connected to a reader. I want to read RFID tags. What will be the consequences if I used this UHF antenna in the near field range when it is ...
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0answers
22 views

How do I learn about RFID families [closed]

I recently got a parallax RFID reader. The documentation says that it only works with the EM4100 family of RFID tags. So I tried looking it up and can’t seem to find any sort of resource explaining ...
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4answers
223 views

Cannot communicate with serial device via an Arduino Nano serial communication

I am trying to communicate with an RFID reader via its serial port. The serial port has an RS232 connector on it. I also want to display the RFID tags ID on a 16x2 LCD screen using an Arduino. I, ...
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2answers
138 views

THM3060 RFID reader setup issues

I got the following rfid reader from a colleague https://www.aliexpress.com/item/4000035966273.html?spm=a2g0o.productlist.0.0.4ac14adcZL3H9M&algo_pvid=af835e25-e532-4426-8714-cd80a9871169&...
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3answers
54 views

Passive (energy harvesting) tag / transponder chipset solution with 12 inches range?

I've been using a 134.2 KHz (FDX-B, ISO 11784/85) transponder/reader for use with implanted and pendant tags. However, I've been frustrated as to the range. Is anyone aware of a chip/circuit level ...
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0answers
26 views

How to get PN532 reader connected by SPI or UART getting detected by pcsc_scan?

I have a PN532 board with SPI and UART connections both. I would like to get it integrated with PCSC so that it can be detected with pcsc_scan command. As PN532 is compatible with CCID as well. What ...
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0answers
53 views

RFID-RC522 with pic16F628A

I want to connect a RFID-RC522 with pic16F628A microcontroller. The only tutorials I could find are those that have RFID-RC522 connected with arduino. The reason why I want to use RFID-RC522, is ...
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1answer
61 views

Low latency passive RFID solution?

I'm an embedded software developer working on a personal project using RFID. I'm attempting to read a passive 13.56 MHz tag moving at 100ft/sec. Given the limited range of passive tags, I'm looking ...
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1answer
32 views

How can I wire a RFID antenna to a Raspberry Pi?

I try to connect this RFID antenna with a Raspberry Pi 4B: What does TX1 and TX2 stands for? How can I make this antenna work like this RFID module I am using from a starter kit, which can be seen in ...

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