Questions tagged [rfid]

Radio Frequency IDentification

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mfrc522 Arduino library -> RFID ERROR: PCD_Authenticate() failed: Timeout in communication

I'm trying to do a project using RFID tags to store information to be retrieved later with another device. Kind of a storage memory. I've bougth several tags which I can write and read with several ...
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Multiple antenna single rfid

I am using 134.2 kHz RFID reader module. My module has VCC pin (5V-12V), GND , TX(don't have RX pin, Module has one way communication) and reset pin. I need to use at least 4 RFID reader for my ...
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RF coils in UK roads tarmac

I'm not sure if this the right place to ask, but I think it's still related here. Increasingly, I've been noticing more and more rectangular cut-throughs in the tarmac of UK roads. Usually, they are ...
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Antenna inductance calculation (RFID applications, inductive coupling)

Inductance of various antenna coils of different shapes can be estimated. Some examples are: A circular coil with single turn. N turn multilayer circular coil. Spiral coil. N turn squae loop coil. ...
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How can I read an RFID tag at the back of a phone FROM THE FRONT?

I'm discovering RFID applications and I would like to be able to read an RFID card I strapped to the back of my phone (the most convenient location for me) by just putting the phone face down on the ...
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Multiple Tags with RFID then play media from RPi

I was wondering if it is at all possible for an RFID reader to read an NFC tag, then ignore that tag, while still being available for other tags which are placed in sequence? The project is a board ...
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How does the resonant capacitor work in an RFID antenna?

I am trying to design a custom antenna for an RFID circuit I am building. I want to make a ~20 cm circular antenna to read a tag that passes through. I still can't have success. Reading this http://...
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125 kHz RFID antenna and read range relation

I have designed 125 kHz RFID reader circuit with which I can read regular card type tags around 4-5 cm and key tag type around 2 cm range. You can see my current circuit and antenna information from ...
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What would be the best small signal model to the following LF RFID circuit?

I'm trying to analyse a LF RFID circuit's antenna of a TMS3705 base station using simulation. I want to estimate the frequency response and the Q factor. The intention is to do it for two different ...
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How to do a comparative analysis of electrical characteristics of two 134kHz RFID circuits?

In the figure below there are two antenna circuits, both are circuits used in RFID at 134kHz, which are external to the TMS3705 IC. Circuit number 1 is an old circuit, circuit number 2 is the circuit ...
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RFID read distance and frequency

In RFID (according to this source: https://blog.acdist.com/understanding-rfid-and-rfid-operating-ranges) there are: Low Frequency RFID: has the shortest read distance, about 10 centimeters between ...
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RFID Multiplexing

I'm planning on doing some project just for fun and education purposes. My project involves RFID technology. I don't have much experience on this topic, however I've been doing research on it and I ...
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Can RC522 wake up host controller from deep sleep?

I am using ESP32 with RC522 (MRFC522) module with Arduino IDE. Library used is MFRC522 installed from arduino IDE too. Examples works fine. Is it even possible to use IRQ pin given in module to wake ...
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Can PN7150 NFC controller deactivate RF Interface?

I have used the PN7150 NFC chip from NXP in autonomous polling mode with LPCD disabled. I can detect NFC Tag and can see NFC coil signals are changing as the NFC tag is detected. PN7150 VDDTx current ...
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Need help troubleshooting problem with RFID antenna

I do computer support in our public library. Lately I've run into some issues with the RFID readers we use for our check out and staff stations. I'm trying to troubleshoot the problems we're having, ...
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MFRC522 RFID sensor initialized but card not detected

I am working on a project, where four MFRC522 RFID sensors are connected to an ESP32 and I want to detect, when the rfid cards are placed in the correct combination. I have designed a custom PCB for ...
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SPI Protocol Not Working Over 3 Meters Distance [duplicate]

I am doing a project using an Arduino and a Rfid Mfrc522 module, both of them communicate using SPI protocol. The Arduino is 3 meters far away from the Rfid Mfrc522 module and I used 7 separate cables ...
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RFID reader reads only one time

I have this module: ebaylink. I have a problem: this reader reads only one time when a tag is in range. For example, when I drag a passive tag to the RFID reader, it reads one time and I want it to ...
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Ethercat, Arduino, RFID

I want to create an installation that can read and feed back information from an RFID with EtherCAT. At the moment I have no components. Here is what I plan to use: Type Ref RFID RC522 ...
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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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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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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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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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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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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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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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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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1 vote
1 answer
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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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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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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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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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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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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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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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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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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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1 answer
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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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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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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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216 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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3 votes
1 answer
102 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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4 answers
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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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2 answers
180 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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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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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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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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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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1 answer
242 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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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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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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