Questions tagged [rfid]

Radio Frequency IDentification

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22 views

Is there a way to repurpose the RDM6300 (125 kHz) to 134.2 kHz? (ISO 11784/85)

I recently bought an RDM6300 (125 kHz) in order to build a DIY animal tag reader. Upon further reading and failed arduino tests I realized the animal (cattle) tags work within a specific frequency of ...
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40 views

Using two UHF antenna wiegand port for intercom with one wiegand port [closed]

I wanna use two UHF antenna wiegand port for intercom with one wiegand port How can i connect them to intercom? Can i use transistor or multiplexer for that?with delay time
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24 views

Related to multiple tags

I am trying to find out the following points related to multiple tags. Whether multiple tags can have same information in them or they will always have different information. Real life example of ...
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12 views

Demodulation and RFID Readers

I was wondering if anyone had an inclination of demodulation and packets regarding RFID chips, sensors, and tags. When working with RF signals, and using a reader the device is capable of collecting ...
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35 views

Confused about smart card wavelengths and antennas

The tap-to-pay cards. These are also called contactless cards, right? And also smart cards? The interrogator frequency is 13.56 MHz, correct? The reply (subcarrier) frequency is .969 MHz to 3.013 MHz,...
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74 views

Is there a type of sensor that could measure how many times something has been scanned?

I'm doing a high school assignment for a project and I wanted to measure how many people are on a bus at a given time by scanning a bus card onto the reader, which hopefully there would be something ...
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132 views

How do I design the Tx and Rx path using a single antenna without using Tx/Rx switch?

I am trying to make a communication system where my module will transmit the commands and the asset tag will reply back (UHF RFID communication (868 MHz).) I will be using an antenna for far field ...
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30 views

Circuit required to clean-up an extracted On-OFF-Keying (OOK) Pulse Interval Encoded bit streams

I have a RFID reader that sends an Amplitude Modulated On-Off-Keying (OOK) Pusle Encodede bit stream to a T5577 RFID tag. I am trying to capture the reader to tag communication. To this end, I built a ...
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27 views

How to implement smart card interface in PN7462 using SWP(Single Wire Protocol)?

I am looking forward to implement the attached design using PN7462 and integrated smart card interface(USIM). The problem is the SWP interface(Pin C6) of USIM. In the reference design, it is being ...
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34 views

MFRC522 RFID reader: Increase range

Is there a way to increase the range of my 13.56 MHz MFRC522 RFID reader? Datasheet: https://www.nxp.com/docs/en/data-sheet/MFRC522.pdf.
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61 views

Calculate inductance and capacitance of a double layer antenna (RFID)

I want to design an antenna that will work with RFID NFC chip NHS3152. The NHS3152 IC specs are: IC capacitance at precise measurement conditions For this particular IC, there is a demoboard. Since I ...
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65 views

Power minimization in a battery powered NFC Reader?

I have been trying to design a Battery powered NFC Reader using Quectel SC60 module with SAM interface. So , the problem is that in the reference design, LDO is always connected to VBAT thus draining ...
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65 views

Secure Access Module(SAM) connected directly to MCU bypassing the reader IC?

I have been trying to design a NFC Reader using Quectel SC60 module with Secure Access Module(SAM) interface. So , the problem is that in the reference design, Secure Access Module(SAM) is directly ...
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53 views

Is using an over voltage rated capacitor going to work equivalently in this circuit?

Total noob at electronics, apologies if this is a daft question. Circuit picture is here which is a RFID module, but in my case connected to an Arduino Nano rather than a USB dongle. I broke the 10 V,...
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30 views

Detection range of RFID with RC522/PN532

I need to read a tag in a range of about 5 to 10 cm (with 2 thin (~1 cm) layers between, one in plastic, the other in ceramic). I tested two devices: the RFID-RC522 and the PN532 (in NFC mode, reading ...
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70 views

RFID with PIC16f877A

I have been working on my school project for couple of weeks and I'm trying to make RFID Door Lock by using PIC16f877A and RDM6300 RFID reader. I made a code works on PROTEUS but I interfaced the ...
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46 views

Backscattering Overview and RFID

I'm having trouble understanding how RFID works on the technical side. I know an RF signal is sent to an antenna, modulated, and then backscattered back to the RFID reader For example, Does this ON-...
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146 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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51 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
42 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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58 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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95 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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20 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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121 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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98 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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199 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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120 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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32 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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56 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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65 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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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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69 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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117 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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55 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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80 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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25 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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76 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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217 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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16 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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33 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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124 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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58 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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600 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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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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79 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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100 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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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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353 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 ...
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1answer
71 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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