Questions tagged [rfid]

Radio Frequency IDentification

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2answers
28 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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6 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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62 views

Where is the RFID antenna hidden on supermarket products? [closed]

Okay. So I read a lot on RFID technology and how it uses a passive antenna design and print them below barcodes. They then use this to detect and 'disable' them for scanning as a customer exits. So ...
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26 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
40 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
24 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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2answers
67 views

How to convert RFID UID from 10-digit type to comma separated type

I am creating application which needs to read RFID tag. In this application RFID UID is saved in comma separated type(ex. 23,192,251,159,179). But I have a reader which is getting that information in ...
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1answer
27 views

Can you differentiate between RFID types?

Background: We have a project were we want to be able to assign a scanned RFID to an object in a database. The scanners, using Bluetooth, will vary wildly, but will use either UHF or LF, but at first ...
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2answers
76 views

NFC Antenna Design/Matching without VNA

I would like to design a circuit around the W7002 antenna (Dataheet) and the NXP PN532 NFC Reader Chip. Since I never worked with antenna design before I do not have a VNA and I also don't have ...
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1answer
42 views

How should I make an ECAD schematic for my RFID chip?

I want to integrate a sensor component with an RFID chip. From the answers I have from this question. I decided I need to contact a PCBA house. I need to draw an ECAD schematic for the PCBA house (...
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1answer
65 views

How to solder wires onto pins of an RFID chip?

I want to integrate a sensor with NXP's NHS3152 (Datasheet). To do this i have to solder the wires onto the pins of the RFID chip. What tools shoudl i buy to do this? What is a good reference to ...
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2answers
36 views

RS232 RFID reader not working

I have purchased an RFID reader that communicates using an RS-232 cable. I have however used an RS-232 to USB adapter to connect it to my laptop. It is an ACM812A RFID reader. When I open the RFID ...
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1answer
36 views

RFID Logger & Battery

I'm a complete novice when it comes to circuitry & electrical engineering. I'm more of a coder. So I really appreciate your input, even if my questions are simple for some. That being said, I ...
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1answer
22 views

RFID Transponder transmission and reception working

I am reading about RFID systems and designs, and I stumbled upon this Digikey article. I am really confused with Figure 5 in that article. In the above IC diagram, I am really confused with pin 2, ...
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1answer
24 views

Options for passive long range sensors

What I'd want to do is to use cheap disposable temperature sensors and to read the temperature data wirelessly. The sensors would be set in a medium such as reinforced concrete. Right now I'm using ...
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0answers
14 views

RC522 has other pins than shown in all the tutorials

I've bought an RFID RC522 module which I intend to use with my Raspberry Pi 3B+. I read the following tutorials and I noticed that their modules have other pins than the one I bought: https://www....
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1answer
15 views

Override value of RFID tag from external sensor

I have the following scenario, there is a RFID tag attached to a certain object which also have a light sensor on it (this is just for illustrative purposes, it could be another type of sensor), I ...
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1answer
34 views

Inconsistent performance of circularly polarized antenna

I have a circularly polarized patch antenna for an RFID reader, with a gain of 8dBi and bandwidth from 914MHz to 919MHz and an axial of 0.34dB. I have read that using a CP RFID patch antenna means ...
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0answers
26 views

Unable to read Gantner RFID wristband from my gym

I have an RFID wristband from my gym, of which I know they use the Gantner systems, so I assume it must be this (however I can't be sure, but it looks exactly like the black one on that website): ...
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1answer
44 views

Design coil for rfid chip

I broke an rfid coil which is soldered to a chip. I want to build the coil as it will save me the pain of replacing the chip as it's not something you can find easily. The coil itself was quite ...
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12 views

Question about RFID reader sensitivity

I have read that in RFID systems, the range is almost always dependent on the tags sensitivity to pick up the signal, not the readers. But this information is related to UHF RFID systems, and I would ...
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4answers
169 views

What is unit jω?

I have an equation, from which I'm calculating the induced voltage received by an RFID tag antenna. I know that \$ω\$ = angular velocity, but what is \$jω\$? And if \$jω\$ is related to angular ...
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0answers
25 views

RFID tag sensitivity

I have an RFID simulation that has an antenna, which generated power is 2 mT in a certain range. If an RFID tag has a sensitivity of -10 dBm, can I use that information to evaluate if the tag will ...
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1answer
40 views

NFC Loop Antenna placement

I'm trying to design a NFC loop antenna according to the following specification: http://www.ti.com/lit/an/sloa135a/sloa135a.pdf In the design the loops are placed on the top layer of the PCB, same ...
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2answers
40 views

Cheap RFID tracking to log entry and exit?

I am performing an experiment where I want to track entry and exit of insect from a small opening over time. My goal is that each insect will have a tag and each pass through will ping the reader to ...
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2answers
150 views

How to transmit a 125kHz signal?

I want to transmit a 125 kHz signal. The square wave signal is generated by the microcontroller (just transmitting no data and no receiving,) the transmitting and receiving antennas are tuned to ...
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0answers
23 views

How to find a threshold power to activate passive RFID tag?

Is there any minimum power which a low frequency RFID tag needs to power itself? I have yet not found this information from any datasheet of several RFID tags. I have a simulation, where I know how ...
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0answers
34 views

What is the minimum magnetic field required to power a passive low frequency RFID tag?

I am trying to solve the minimum magnetic field required to power a low frequency RFID tag. I found the right equation from the RFID-Handbook, but I have 2 parameters that I can't solve, these are: ...
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23 views

Find PCB Antenna impedance and matching circuit

I'm working on a project that uses NFC interface. I need to design two antennas: one for the RFID tag and another for the NFC initiator. I decided to use the design proposed in the evaluation kits. ...
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0answers
78 views

Key fob receiver reverse engineering: IC identification

I'm doing reverse engineering on a hardware of an equipment, this equipment is able to identify the presence of a RF signal from a key fob. Unfortunately, it was not possible to identify the ...
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0answers
36 views

RFID reader array using row/column RF switches (multiplexers)

I need an 8x8 grid of RFID readers arranged on an 8"x8" board. The RFID tags will be placed only millimeters above each antenna. I was wondering if I could use one 1:8 RF switch (e.g. pSemi PE426482) ...
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4answers
93 views

RFID (13.56MHz) GND plane over antenna

I dissasembled multiple RFID devices to study their design. The following reader attracted my attention: This is a four layer PCB, the anntenna seems to be 4-turn symetric and is layed out on the two ...
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2answers
44 views

LF RFID signal jammers

I am currently researching into the security of RFID based access control in relation with jammers. For an experiment, I am trying to build a device that can jam 125 kHz RFID cards from like a meter ...
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1answer
101 views

How to mitigate common mode noise introduced by the (LF) RFID antenna driver (on un-earthed SMPS)

When powering my RFID reader board using a SMPS without GND-PE connection, I can observe quite an amount of common mode noise: ~340Vpp from mains. ~4Vpp @ resonant frequency of the antenna. (This ...
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1answer
60 views

Building a UHF RFID Reader, FCC regulations?

I've been working on a project that involves tiny UHF transponders (ex. OMNI-ID Fit 220) that fit into a product with very limited space. We wanted to build our own reader (5 or 6 of them) because it'...
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1answer
30 views

Designing a low-cost, low-performance UHF RFID antenna 902 - 928 MHz

I use UHF RFID readers to read Gen2 RFID tags. Here's the reader I use but it could be any equivalent reader configured to run at 902 - 928 MHz. https://www.digikey.com/product-detail/en/thingmagic-a-...
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2answers
102 views

RFID reader(125kHz) switching between antennas

My arduino application wants multiple separate cards in multiple separate (nearby) locations to be readable at roughly the same time. I am using a RDM6300 module, with a multiplexer to switch between ...
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1answer
72 views

How to identify remote keyless entry (RKE) frequency?

I need to design a system able to identify which frequency is being used by remote keyless entry (RKE). I found that the wireless carrier frequency can be 315MHz in the US/Japan and 433.92MHz (ISM ...
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0answers
42 views

Prevent Reception from an Extended Distance (Beyond Design)

I have a magnetic field that is being induced onto a power line by a transmitter, which is following the length of the power line to the receiver. The receiver communicates via a loosely coupled coil ...
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0answers
65 views

I am not able to get any response from ST25RU3993 via arduino SPI

I ran out of clues of what could be stopping me from driving the ST25RU3993, hopefully I can get some useful directions from here... I am trying to drive the ST25RU3993 Eval board using SPI, with my ...
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0answers
48 views

Why does different antenna inductivity influence LF-RFID performance?

I'm experimenting with LF (125kHz) RFID reader antenna design. And trying two different antennas yields very different results in terms of read sensitivity. Even though one antenna is driven with ...
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1answer
36 views

Power received by RFID tag

Power calculation from E and H field Following from the previous post above. The user provided me with some assistance however I am still a bit unclear on how to apply the equations provided. Could ...
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0answers
11 views

Is HID 125 kHz mini mullion proximity reader Compatible with Suprema DM-20 and Corestation?

Can we use HID Proximity cards and HID 125 kHz mini mullion proximity reader for suprema DM-20 and Corestation Controller using wiegand connection? If they are compatible how many DM-20s would be ...
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1answer
57 views

Power calculation from E and H field

I am using gprMax to simulate my design. The design is shown in the picture. It consists of an RFID system inside a steel structure. The transmitting antenna is placed in the middle of the container ...
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0answers
11 views

rdm6300 RFID module issue

Can RDM6300/RDM630 module be used as an RFID Writer? im already managed to use it as a reader but can find out how to implement the writing function can somebody help me?
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1answer
39 views

Power supply filtering RCL-filter vs alternatives (for LF-RFID driver)

simulate this circuit – Schematic created using CircuitLab This schematic is the manufacturers dev-board design for the RFID-IC power Supply, using a large power inductor at 4A I_RMS and 22uH. ...
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0answers
97 views

Can't find Fast switching BJTs

I'm looking for a replacement for a FET switch that switches at 40 kHz. When the FET is on it is connecting an RFID antenna to ground. When off, the antenna is open. It does this in order to ...
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1answer
124 views

Arduino RFID Multiplexer Antennas

I want to make a electronic chessboard that detects the position of every piece on the chessboard. Every chess piece will have RFID tag. My idea will be to have 2 multiplexers(1*8) one for the rows ...
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1answer
29 views

Simulating RFID coil with FEMM

Is it possible to simulate planar coil printed on a PCB with FEMM? The only idea that come into my mind is to have 2n (if n is the number of turns) regions, each region represents a copper trace and ...
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0answers
26 views

Separate antenna in specific (or similiar) RFID reader?

I'm just wondering if a specific (or similiar) RFID reader has a seperate antenna or if it is part of the board. Here is a link to the one I'm thinking of on amazon: https://www.amazon.ca/gp/product/...

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