Few things... Socket programming beyond the trivial examples can be confusing so here is what you need to know. 1) Your RFID reader needs to open a connection to the server on a specific port. So you reader should be programmed to send messages to 192.168.1.12 on port 9999. In your code...

RFID

TCP/IP

Multiple RFID scanner scanning on a form in VB.NET

26 Aug 2018 by OriginalGriff

Chances are you can't, not without significant changes. The use of a textBox implies it's being entered direct from the RFID reader as keyboard data - and there is your problem: Windows does not store the "source" of keyboard input at all, so there is no way for your program to determine which...

RFID

RFID tag Locking User Memory

17 Jul 2013 by Kishore Kumar

I am working on the RFID tags.I am using Speedway Revolution Reader(R-420) for reading the tags.http://www.impinj.com/Speedway_Revolution_UHF_RFID_Reader.aspx[^] I am using Confidex Steelware Micro ETSI Monza tags (Product No....

RFID

RFID reader project...

14 Oct 2015 by Kornfeld Eliyahu Peter

I have been asked to check a possible setup to a RFID reader system...The basic idea is 1-3 antennas connected to a reader module, that talks to a card-sized computer (Arduino like), that card-sized computer will talk to a server via WiFi (REST over HTTPS)...Or on the other way around the...

RFID

WiFi

RFID reader project... Take 2

14 Oct 2015 by Garth J Lancaster

1. how long is a piece of string - reliability ? are we talking remote/out in the field or in an office, do you have 240VAC (or equivalent) power ? If you are 'remote' and stable WiFi & Internet connection is going to be difficult but there is mobile/'Cell' coverage you could think about a ...

Error: Invalid URI: The hostname could not be parsed. How to make the code run.

15 Dec 2015 by Dave Kreskowiak

You're not giving it a valid URL to parse. You keep typing: //ipAddress:portYou're missing the part that goes in front of the two slashes: http://ipAddress:portBut, what the schema name should be depends on the server that you're trying to connect to. It could be ftp:, or file:, or...

RFID

How do I get the rfıd card ID in visul studio 2013 without a button option ?

15 Oct 2016 by Syed Zain Nasir

You should have a look at this tutorial Interfacing of RFID RC522 with Arduino , they have interfaced Arduino with RFID and then printed the data on Serial Port.Next thing you need to do is to get this Serial data in Visual Studio, you can check this tutorial on How to use Serial Port in...

Did any one use EM-18?

25 Feb 2017 by Patrice T

Quote:I have to use it for customer authorization.I want to know that How many cards it can authorize? Is there any limits? Please guide me.This question is out of topic ! This forum is for coding problems.Ask the maker or in a users forum, if they don't answer, change of reader.Quote:Is...

RFID

Error arduino no matching function for call to : httpclient:httpclient()

16 Dec 2020 by CPallini

Quote: HttpClient http; The HttpClient class has NO default contructor. See the documentation (i.e. the source code...): GitHub - amcewen/HttpClient: Arduino HTTP library[^]. Probably you have to pass your client to such a constructor, but it is...

Arduino

RFID

How to create task for rfid access in embedded C?

25 Apr 2022 by OriginalGriff

Start with the RFID reader manufacturer website: they will have the details - and maybe even sample code - that you need. RS232 is just an unclocked serial link - you need to know the port parameters (baud rate, BPC, stop bits, and parity) before...

embedded

RFID

How to create task for rfid access in embedded C?

25 Apr 2022 by KarstenK

You need to learn C in depth and than try your luck with RS 232. Than you may send some bits to the controller and get some back. Start with some video RS 232 tutorial and search for more. You must also understand threading because that...

embedded

RFID

Recommended Transponder software

4 Dec 2021 by S'phush

Hi, I am a third year software developer student, I am planning to write a system that incorporates RFID technology and Transponders. My preference in language is C#. I would like to know, what software is recommended to write my code in and whether or not C# caters for all functionalities ?

hardware

RFID

programming

[C#] How do I read an NFC tag using WinScard.dll

8 Feb 2014 by Member 10581570

Hellomy name is Frederic. For two weeks I've been working on the task to read the tag, and a stored link, of an active NFV TI Chip.I also have a problem reading the ATR.My reader is a Springcard H663.I use the winScard.dll and managed to use SCardEstablishContext() and...

RFID

Java: Getting data RFID Serial Rs232 in JFrame Class

14 Apr 2014 by BBSid

**Getting data on from rfid scanner as Serial rs232 port in JFrame**, in this case I have made a JFrame form and I have a JTextField for storing data rfid as a String. Actually, I found a class from internet that read the RFID reader as byte, now How To get data from my RFID Class to my...

I want to list all RFID Readers in the network. Is it possible using wsdiscovery? If so, how?

17 Jun 2014 by Member 10891385

I'm using a MOTOROLA FX9500 Fixed RFID Reader which is connected to my network.If there is more than one reader (same model) in the network, how do I list all RFID Readers in the network? Is it possible using wsdiscovery? If so, how?

LAN

RFID

networking

iPhone not connecting with bluetooth RFID reader

3 Jul 2014 by shankha2010

I have iPhone 4S [iOS version 7.1.2].Its connecting fine with my bluetooth audio playerbut not able to recognize any other bluetooth device [like and android or plain Nokia phone]My main main objective is to connect it with one rfid reader [see here]which doesn't support what iPhone...

How to program RFIDs? and how to read them?

11 Jul 2014 by Richard MacCutchan

See https://www.google.com/search?q=RFID[^].

RFID

Connecting the handheld database of my application?

11 Sep 2014 by Member 11075129

Good Morning. This is my first question :)I need your valuable help. I happen to have an application developed in Visual Studio 2008 for Windows CE which is used to read RFID tags in a HandHeld, but I want to use the same application in a Handheld Cmc168c (china) with Windows Embedded...

WinMobile

SQLite

RFID

Connecting the handheld database of my application?

11 Sep 2014 by MukeshSagar

First Check the connection string that is used in the application, this may be the root cause of the above said problem.

WinMobile

SQLite

RFID

How do I get the rfıd card ID in visul studio 2013 without a button option ?

15 Oct 2016 by Member 11619483

Hello,I want ask that, how can I read rfid card information in visual studio 2013 without a button OPTION ? I mean we can read the card ID in Arduino program and then we connect aduino with visual studio. Now we can read the card ID in visual studio 2013 but the user have to push the button...

How do I accept payments on a desktop java application?

13 Jul 2015 by TorstenH.

You should try out the Paypal API.https://developer.paypal.com/webapps/developer/docs/integration/direct/accept-credit-cards/[^]You can store the data locally and transmit it later to the servers.Please be aware that storing credit card info is critical and needs proper work.

Java

RFID

RFID reader project... Take 2

24 Oct 2017 by Kornfeld Eliyahu Peter

In the first part[^] I asked some too vague and general question...Now I have more thoughts in place so some more concrete (but not too concrete) question...Now I have several (actually I build only one, but that's unimportant) RFID reader modules...These modules have the RFID reader...

Asp .net mvc web application, rfid and bio-metrics attendence.

5 Feb 2016 by Jatinath

Hi,to communicate and read details from RFID or BIO Metric machines; you have to enable communication mode ON on machine. then through specific port/communication type you will be able to read those attendance data.then on WebApplication you will able to display or modify those...

how do I read out data using my serial ports from my database

3 Jun 2016 by Member 10196038

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO.Ports;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication2{ ...

Arduino

RFID

How do I calculate physical distance between RFID reader and TAG

11 Jun 2016 by Madhuri Gamane

I have UHF tags and ATID reader, i want the physical distance of reader to tag.. i have RSSI values, But i am unable to measure physical distance. Is there any way to calculate physical distance from tag to readerWhat I have tried:used RSSI to calculate distance but it is changing its...

RFID

How do I calculate physical distance between RFID reader and TAG

11 Jun 2016 by Sergey Alexandrovich Kryukov

General-purpose RFID physical operation is unsuitable for measuring distances.The only thing I could think of is this, which you can use with RSSI, but you hardly can hope to get any acceptable accuracy. In radio domain, the principles of measurements are that of radar:Radar — Wikipedia, the...

RFID

How do I calculate physical distance between RFID reader and TAG

11 Jun 2016 by Dave Kreskowiak

No, there is no way for you to measure distance to the tag with any accuracy and/or reliability at all.The consumer grade RFID technology is just not setup to do that.

RFID

Getting Started With Node-Red and RFID on Intel® IoT Gateways

19 Aug 2016 by Intel

Node-RED is a tool for wiring together hardware devices, APIs and online services in new and interesting ways.

IoT

product-showcase

RFID

Did any one use EM-18?

25 Feb 2017 by Graeme_Grant

ppolymorphe has summed it up nicely. After 10 seconds search on Google: EM-18 - Google Search[^] Here is where you will get the information: [^] & click on Contact Supplier.

RFID

Help regarding not displaying tag ID in a textbox

27 Mar 2017 by Nazneen s

Hi, i have build a Project where Employee Swipes their RFID card and its saved in to database.i Have a textbox name txtSwipe in which Employees TAG id is getting displayed and other processes like Progressbar and different type of messages all are attached with that txtSwipe. i have...

SQL

RFID

Help regarding not displaying tag ID in a textbox

27 Mar 2017 by Nazneen s

Never mind i solved it by setting Passchar property of textbox

SQL

RFID

Pseudo asynchronous reading using multi threading in C#

31 Mar 2017 by RickZeeland

I think you first need to read up on Tasks (which is the modern way of threads). Here is a good article about it: Task Parallel Library: 1 of n[^] As you already mentioned "Pseudo", it is probably best to not let all Tasks access the same USB port simultaneously. When working with Tasks you can...

asynchronous

RFID

threads

USB RFID reader to serial

19 Oct 2017 by dnibbo

Hi all We have a cheap and nasty RFID reader to scan some old key fobs (125KHz) which works OK but... the problem with it is that it is a HID device which just splatters any data it reads into any writable field on any screen so if the user has a Word document open and active it can scribble...

RFID

USB

USB RFID reader to serial

18 Oct 2017 by CPallini

The USB to serial converters (at least the one I know of) work in the opposite direction (they are USB devices, you need a USB host for your RFID device). Quote: Searched high and low for a desktop serial RFID reader; they are either 1.3GHz or USB only However they could possibly behave...

RFID

USB

USB RFID reader to serial

19 Oct 2017 by Dave Kreskowiak

You're not going to such an adapter. Your "adapter" would have to be smart enough to know that it's connected to a keyboard HID device and how to translate "keystrokes" to serial data. Your problem is that you're using a "keyboard wedge" scanner. The scanner exposes itself as a keyboard to the...

RFID

USB

How to read RFID chip throuth NFC

26 Feb 2018 by Zhivko Kabaivanov

I am trying to read the RFID chip that is in the passports and some ID cards. I have RuggON Rextorm PX501 Windows 10 tablet which has PN544 NFC chip. Can someone give me directions how to receive the information, i see that it uses COM port for communication but is there a way to receive the...

Windows

RFID

I want to have a good skill in window programming.

28 Mar 2018 by Member 13647908

Hello I am doing my PhD in Information and Communication engineering. I specialize in RFID and Antenna. I want to be making Window program and link it with RFID application. In our Lab we use MFC programing. It seems to be past??. Can you suggest or recommend an easy way to learn fast and be...

C++11

RFID

I want to have a good skill in window programming.

28 Mar 2018 by CPallini

Quote: Can you suggest or recommend an easy way to learn fast and be great programer? "There is no royal road to Geometry" --Euclid MFC is obsolete, your best bet, as already suggested, is C#.

C++11

RFID

I want to have a good skill in window programming.

28 Mar 2018 by KarstenK

The advantage of C++ is the direct memory and hardware access. In C# and Java you need some extra stuff for that. Looks like the RFID stuff isnt to problematic. You are right that MFC is a bit outdated but its does its job. I can recommand you this great C++ tutorial because the language is...

C++11

RFID

Multiple RFID scanner scanning on a form in VB.NET

26 Aug 2018 by Amit Sharma (Patna)

There are more than one RFID scanner attached with an computer. if more that one rfid card holder want to scan their card, their Tag mixed with each other tags. I want that if X has started scanning and in the mid time Y user also started scanning then X user's card should be scanned first...

RFID

How to receive data from RFID TCP/ip reader C# or VB.NET

22 Oct 2018 by alobiedy

i am trying to read data from RFID reader using C# or VB.net my PC as server with ip 192.168.1.12 Port 9999 reader IP 192.168.1.99 https://preview.ibb.co/hi3gvf/555.jpg What I have tried: tcpLsn= new TcpListener(8002); tcpLsn.Start(); Thread tcpThd = new Thread(new...

RFID

TCP/IP

How to receive data from RFID TCP/ip reader C# or VB.NET

22 Oct 2018 by Ebenezar John Paul

I believe the key to your requirement lies in the stream handlers. For this scenario, NetworkStream would be a better suitable option. But, you can decide based on your need. Here is an elegant sample by dottutorials Hosting Data (Server): static string ReadData(NetworkStream network) { ...

RFID

TCP/IP

Encoding an RFID card using primacy printer from evolis

21 Jun 2019 by Nice Kloe

Hello everyone! I'm actually working on a project and one of the module is about encoding an RFID card. For this need, I intend to use Primacy printer. The itchy issue is that I'm completely confused on what to do and how to go about this. The project is being coded using ASP.Net MVC5. Some...

ASP.NET5

RFID

encoding

Encoding an RFID card using primacy printer from evolis

21 Jun 2019 by RickZeeland

Take a look at the SDK, this even allows using networked printers: Evolis Premium SDK (Software Development Kit) for card printers | Evolis[^] But my first thought would be that ASP.NET is not the right choice for doing this kind of thing.

ASP.NET5

RFID

encoding

How can I initiate a IP camera by sensor and store in database.

3 Dec 2019 by Member 14677113

I would like to know if it is possible to sensor activating a IP camera to snap a picture. The sensor will be activated by a RFID card. the RFID unique ID must then be associated with the picture taken and stored in a database. Thank you for your time. What I have tried: I tried to use...

data-binding

RFID

database

How to link RFID SDK with visual studio C#

26 Jun 2020 by katkot_rewsh

I will buy RFID readers and supplier send me SDK works with C# the question how to link the SDK Libraries with Visual studio to read and write Any one can help with small example how to import the Libraries and make simple read code ?? I dont...

RFID

SDK

How to link RFID SDK with visual studio C#

26 Jun 2020 by Dave Kreskowiak

There is no one way to "link" (which isn't even a thing) the SDK to C#. How to use the SDK is going to be covered in the documentation for it.

RFID

SDK

How to connect to multiple RFID reader with C#

7 Sep 2020 by Mohammad Razmi

Hello I have 4 ZK-rfid101R reader which released with a SDK API for programmers... I actually need to create a program to connect to 4 of them simultaneously and read data from them bur just with one program. I need to create a list of that api...

RFID

How to connect to multiple RFID reader with C#

7 Sep 2020 by Dave Kreskowiak

You don't make multiple instances of the API SDK. That's not a thing at all. How you do this depends on the interface of the device. How do these thing connect to the PC?

RFID

C# multi-threading in RFID readers

20 Sep 2020 by Mohammad Razmi

I've written a program which could connect to several RFID Reader and start to detect tags simultaneously. But because all of them are working on UI-Thread (Main Thread) my both UI and reading function become too slow every time I add a new...

RFID

threads

C# multi-threading in RFID readers

19 Sep 2020 by honey the codewitch

I sure hope I understood your question correctly. Here goes: First of all, I'd consider using the Task API as opposed to a thread directly Inside your timer_Tick() function // make sure to do "using System.Threading.Tasks;"...

RFID

threads

C# multi-threading in RFID readers

19 Sep 2020 by OriginalGriff

To add to the possibilities Honey the codewitch has mentioned a version which is pretty simple for "threading novices" to use is the BackgroundWorker Class[^] - it's event driven, and provides progress reporting back to the UI thread for updates...

RFID

threads

RFID raw data to wiegand

24 Nov 2020 by Member 13220087

Hello, i have two RFID readers. When i put card to it output is 0003900076 in decimal and 003B82AC in HEXa. I need compare card with database record but there are card IDs in different format - card example from above is in database in...

RFID

C# RFID attendance system with arduino. Log in log out time?

3 Apr 2021 by Member 15133370

I came up with an interesting project with arduino and an RFID reader. I managed to send the RFID UID from the arduino to the C# program and I can store it in a file and I made a class too. And when a tag is read I can see in an a list view...

RFID

C# RFID attendance system with arduino. Log in log out time?

3 Apr 2021 by OriginalGriff

It can get complicated, because not all people who log in will log out, and not everybody who logs out will have logged in. People are like that ... Google will help you find a lot of existing examples you can learn from: Writing an attendance...

RFID

Recommended Transponder software

4 Dec 2021 by OriginalGriff

To be honest, it's going to depend too much on the individual software that the manufacturer of your RFID hardware provides and exactly what connections it makes to your system. Chance are it is just serial data, probably packaged with a start /...

hardware

RFID

programming

How do I read data from a no-name RFID reader?

5 Nov 2022 by Majestic Frog

Hello everyone! I am currently having a big issue with an RFID Reader. I'm trying to read data from this reader from Amazon right here, which only supports Wiegand 26 an 34 transmissions, using an ESP32 device and utilizing this library from...

How do I read data from a no-name RFID reader?

2 Feb 2022 by CPallini

It looks the library is gathering the bits correctly ( 1204937293 = 0x47D1E24D, you see, the last 3 bytes are shown reversed in the output you posted). but is assuming some particular message format while presenting them. You may have a look at...

How to create task for rfid access in embedded C?

25 Apr 2022 by Charan Kumar N

I have a RFID reader which gives output in rs232 and I want to create a task for reading the data whenever a person scans the RFID card can anyone help me with how to create a task for this ? What I have tried: Not familiar with the task creation

embedded

RFID

How to create task for rfid access in embedded C?

25 Apr 2022 by merano99

embedded, C, RFID I have a RFID reader which gives output in rs232 and I want to create a task for reading the data whenever a person scans the RFID card can anyone help me with how to create a task for this ? 1. You want a Thread listen to the...

embedded

RFID

How do I read data from a no-name RFID reader?

4 Nov 2022 by Member 15820716

w26 generally uses 2 site digits and 4 ID digits with the site sent first, then the ID, BUT each part is sent in reverse order. So if the code is p1 Site1 Site2 ID1 ID2 ID3 ID4 p2 it gets encoded as p2 ID1 ID2 ID3 ID4 Site1 Site2 p1 with p1...

How do I read data from a no-name RFID reader?

5 Nov 2022 by merano99

Found the statement that the library usually passes the order of the bytes as they come in over the data lines. There should be readers that can invert the read data, otherwise you can write a function that inverts the bytes (BIG- LITTLE ENDIAN...

DIY electronic RFID Door Lock with Battery Backup

7 May 2018 by Elmue

An electronic door lock that replaces a mechanic key by an RFID card or RFID token.

how to handle multiple rfid readers?

15 Aug 2014 by Dave Kreskowiak

That depends entirely on your hardware and the information you can get out of the reader when it scans something.This is where you hit the documentation on the reader and it's SDK, if there is one.

RFID

Get all RFID readers connected to the network

22 May 2014 by AjinkyaT

Hi,I need to get all the RFID readers connected on the ethernet, currently I have an application which connects to one reader at a time. Also the IP address for the reader needs to be specified for connection.I am using Motorola FX9500 fixed RFID readers.Is there any way by which we...

RFID

Get all RFID readers connected to the network

22 May 2014 by Dave Kreskowiak

Unless your RFID readers have some mechanism on them that advertises their existence on the network, you'll have to poll each and every IP address in your corporate address space to see if it's a RFID reader.If there's an SDK for this thing, consult the documentation to see if there's a...

RFID

Get all RFID readers connected to the network

22 May 2014 by Vedat Ozan Oner

there exists a protocol stack presented by EPCglobal here[^]They described your need here:Discovery, Configuration & Initialisation Standard for Reader Operations[^]If your reader is compliant with this protocol, then you can find some middleware libraries or applications which fulfill...

RFID

how to handle multiple rfid readers?

15 Aug 2014 by abid zahid

i am trying to use multiple rfid door lock but records will save in one server so how can i handle multiple rfid readers. can i get rfid reader id with rfid tag id or assign unique id to rfid reader ?Thanks!

RFID

Wireless communication between esp8266 (nodemcu) and C# application

23 Oct 2017 by CPallini

Porbably you need a TCP server on your PC (C# application) and a TCP client on your nodeMCU. You may find many examples of both on the web.

Arduino

IoT

RFID

I want to have a good skill in window programming.

28 Mar 2018 by Mehdi Gholam

Communicating with RFID devices is done through a serial port (usb port) which is the simple part. Writing UI for your application is the hard part, doing it in c++ if you have little experience is counter productive, try a simpler more forgiving language like c# or java instead.

C++11

RFID

Error: Invalid URI: The hostname could not be parsed. How to make the code run.

15 Dec 2015 by Member 11861648

Usage: Please provide valid arguments, such as:customschemename://readerIP:portname --ant 1,2I have a reader configured as follow:Ip:10.0.0.101 Local Port:49200 Remote Port:5084Executable file: Reader.exeWhen a type: Reader //10.0.0.101:49200 --ant 1,2 or ...

RFID

How Do I Put Rf Comm On Proteus?

11 Feb 2015 by Member 11445561

having problem with proteus.couldnt find rx n tx in proteus. how to put a rf transmitter and reciver in proteus

RFID

How do I accept payments on a desktop java application?

13 Jul 2015 by Member 11835032

I'm creating a java application to manage rentals. I need to be able to scan RFIDs, which made me lean towards creating a desktop application (so that I could easily interface with a USB connected RFID scanner). I also need to accept credit card payments in this application. Every gateway / API...

Java

RFID

Asp .net mvc web application, rfid and bio-metrics attendence.

4 Feb 2016 by jk.deso@gmail.com

i am working on ASP .NET MVC, Need to develop Web application for attendance management for both student and staff from RFID and BIO metrics devices.Please share your ideas on this i need some sample codes.What I have tried:I tried in many sites i didn't find anything.

Wireless communication between esp8266 (nodemcu) and C# application

23 Oct 2017 by Member 13479861

Hello, I am working on a project which is basically sending information(a string) read by rfid reader connected to nodemcu(where nodemcu is acting as access point) over wifi on the other end a laptop connected to the network provided by nodemcu and getting information in c# application. And...

Arduino

IoT

RFID

Reading serial data in ASP.NET

25 Feb 2014 by Dean_Wi

I am trying to read serial data in ASP.NET application but i get an exception -> "System.NullReferenceException: Object reference not set to an instance of an object." I have attached my code. Please look into it and tell me how can i read the data. Thanks.Code--------using System;using...

ASP.NET

RFID

How to program RFIDs? and how to read them?

11 Jul 2014 by Member 10940314

How to program RFIDs? and how to how to read them?

RFID

Can't communicate with RFID reader.....

30 Mar 2015 by SAGAR BHATT

i have RFID reader ZK-RFID102 and it had came with a SDK(SDK is came for .NEt/Java both) to develop and communicate with the reader . i cant fetch data from RFID reader. i want to communicate with RFID using NETport. (RFID can be connect with NETport or Serialport).i want to fetch unique tag id....

Java

.NET

RFID

Problem in connecting to the device via zkemkeeper.dll in windows application c# .net

14 Apr 2021 by jk.deso@gmail.com

I'm trying to connecting RFID and biometrics devices in network, my loacal ip is 192.168.1.24 and the RFID device ip is 192.168.1.22, i'm using Visual studio 12 an sample windows application. to connect this device but it through an error "Unable to connect the device,error code = -201" . please...

.NET

biometrics

RFID

Pseudo asynchronous reading using multi threading in C#

31 Mar 2017 by Member 13097876

I am developing winforms application using C#. This app uses ThingMagic USB Plus RFID "M5e" reader in order to scan the tags that found. I have the manual of the reader which is Mercury API and it provides codelet sample. In the attached samples, there is not any Pseudo Asynchronous example, but...

asynchronous

RFID

threads

How can I initiate a IP camera by sensor and store in database.

3 Dec 2019 by Member 14677113

Well I use microbits with Micropython. Then the idea is to upload it to Mysql database and from there it should be possible to extract from any device, IOS, Android or Windows

data-binding

RFID

database

Error arduino no matching function for call to : httpclient:httpclient()

16 Dec 2020 by spam akun

i try to make project arduino uno + ethernet shield with RFID can someone help me What I have tried: //----------------LIBRARIES---------------- #include #include #include #include...

Arduino

RFID

Problem in connecting to the device via zkemkeeper.dll in windows application c# .net

14 Apr 2021 by Member 13433362

Were you able to resolve the -201 error? I have the same problem :/

.NET

biometrics

RFID