Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

Radio-Frequency Identification. Uses electromagnetic fields to transmit data for identification purposes, such as between a tag and a reader. RFID is the precursor to Near Field Communication (NFC).

0
votes
0answers
16 views

Arduino Uno - How to write personal data in NTAG213 using RFID-RC522

I am trying to write some data in NTAG213 sticker with this code: #include <SPI.h> #include <MFRC522.h> constexpr uint8_t RST_PIN = 9; // Configurable, see typical pin layout above ...
0
votes
0answers
25 views

How to use passive RFID tags with arduino to track things [closed]

I am working on a project where I have multiple objects with passive RFID tags on them.I want to scan all the objects together (maybe one by one but really quickly in that case) and keep on checking ...
0
votes
0answers
18 views

HID card reader with NodeMCU ESP8266 reads all zeroes

I have connected an RFID HID PROXY PLUS card reader with a NodeMCU ESP8266. It will read the card and send the data to database. It was working fine, until this evening. But for testing purpose I ...
1
vote
4answers
61 views

Hex/Byte Reversing and Conversion

I'm working on an RFID system using a MFRC522 with this Library : https://github.com/miguelbalboa/rfid Here's the code I have right now: int A=(mfrc522.uid.uidByte[0]); int B=(mfrc522.uid.uidByte[1]);...
0
votes
0answers
25 views

RFID Based Attendance System

I'm currently making a simple RFID based attendance system that I'm planning to connect to Excel for data logging. Here's my problem: the code works fine, but for some reason, I think some of my cards'...
1
vote
1answer
27 views

Power RFID module using GPIO

I am building an ESP8266 device that uses RFID but need to conserve battery power. The ESP is a Wemos D1 Mini and the RFID module is a RC522 (still waiting for it to arrive), which needs 3.3 V. ...
0
votes
0answers
38 views

Don't display repeated data output on serial monitor of Arduino

In this code I am taking the TID (tag ID) data (20 bytes of 160 bits) in the form of array according to the Sparkfun (manufacture) documentation and RFID tag detection code and it's working correctly ...
2
votes
1answer
26 views

MFRC522: Firmware Unknown

Can someone help me what is the meaning of this sketch? It always outputs in the serial monitor: Firmware Version: 0x1C = (unknown) Scan PICC to see UID, SAK, type, and data blocks... This is the ...
0
votes
1answer
80 views

Arduino RFID with motor and limit switches

Thanks for looking into my Arduino code. I'm building an automated sliding draw, and I'm trying to activate the motor with a RFID scanner. The scanner waits for the token, and once it detects a token ...
1
vote
1answer
51 views

How to run Arduino code on Linux? [closed]

I want to use an MFRC522 module as explained in this video. But is it possible to get around with Arduino and use a TTL to USB converter to connect RC522 directly to my PC running Ubuntu? Using the ...
0
votes
1answer
350 views

RFID-RC522 Cannot read from MIFARE Ultralight

I tried many ways to get and print UID and other data from MIFARE Ultralight but it always ends with error. I am using RFID-RC522 reader with Arduino UNO and MFRC522 Library. I can normally get and ...
1
vote
1answer
91 views

Save Leading Zero HEX into String RFID RC522 Arduino

I'm using RC522 to read RFID card. All is until if the HEX leading by 0 then i can't save it into String. But if i print it to Serial all is well. Here is my code: #include <SPI.h> #include <...
0
votes
1answer
776 views

Sending Data from ESP8266 to PHP

I want to display the RFID tag value to a html file. I am using ESP8266 ESP-01 module, EM-18 Reader Module, Arduino Uno and Xampp for hosting PHP. Right now, I am getting a value of "255" in ...
0
votes
0answers
15 views

LLRP on Arduino

Anyone ever worked or know of an LLRP (http://llrp.org) implementation on Arduino ? LLRD is a standard to communicate with RFID devices. Thanks.
0
votes
0answers
28 views

MFRC522 read anomalies

I'm wondering if there's anyone that may be able to shed some light on a issue I'm having with an Arduino Mega and MFRC522 NFC reader. Before I describe the particular issue I'll point out that the ...
0
votes
1answer
68 views

Arduino RFID tag scanning problems

For a school project, I'm using an Arduino Uno and a Parallax RFID together with some other components, I used a script I got from Instructables for reading my serial input from the RFID (link: http://...
1
vote
1answer
390 views

MIFARE RC522 I2C Library

I was looking at this link on RFID I2C interface. I added the library to arduino, but in main.cpp, I see an error: In function 'void setup()': sketch_mar27a:16: error: no matching function for ...
0
votes
1answer
51 views

Rfid with Adafruit fingerprint together not working in Arduino Uno

I have edited my Code and now the issue is both are working but not together #include <Key.h> #include <Keypad.h> #include <Adafruit_Fingerprint.h> #include <SD.h> #include &...
0
votes
0answers
151 views

Android NFC reader

I am looking for a way to communicate between an arduino and an Android device without direct connection, so I am looking to use NFC. I want to create an arduino NFC reader and a corresponding ...
1
vote
0answers
216 views

NFC PN532 SPI - Error: Timeout when waiting for ACK

I've been struggling to get the PN532 module working over SPI with an Arduino Uno. I have the wires connected as follows: SCK -> 13 MISO -> 12 MOSI -> 11 SS -> 10 VCC -> 5V ...
-1
votes
2answers
285 views

ESP8266/NodeMCU unable to communicate with MFRC522 RFID reader

I am trying to use the 'DumpInfo.ino' example file to dump an rfid tag, the only changes i have made to the example is changing the pin settings. #define RST_PIN 3 // Configurable, ...
-2
votes
2answers
47 views

Passing the result of the variable to another variable

Hello everyone i'm figuring if this variable can be passed to another variable. I'm using RFID RC522 Here is the code: #include <SPI.h> #include <MFRC522.h> #define RST_PIN ...
0
votes
1answer
43 views

arduino rfid with led, code is compiling but not working as expected! [closed]

code is compiling, what I want is that when rfid tag kept led should get on but instead its getting to the else loop. int count = 0; char input[12]; // rfid input int led = 3; // led pin char first[...
0
votes
0answers
253 views

Read/Decode EM4100 RFID card

I'm trying to read a 125Khz RFID card from my own reader and decode the data in to meaningful number that is printed on the back of this card, Now, i know the second part (089,47544) is another ...
-3
votes
2answers
527 views

Problem “Didn't find PN53x board” in Arduino Uno E-Card Reader [closed]

This is component to make E-Card reader, using arduino uno pn532 Code if (success) { // Display some basic information about the card Serial.println("Found an ISO14443A card"); Serial....
2
votes
1answer
107 views

Arduino TimerOne breaks the program when calling “digitalRead”

I'm trying to make this project. But i have a problem running this code. It appears to be val = digitalRead(inPin); breaks entire program. just because i call this from the callback function which ...
0
votes
2answers
306 views

Rfid reader and SD card shield won't work together

I recently encountered a problem that's been bugging me for days. I want to make a project using a RFID reader and log data on an SD card with an Arduino Nano, but apparently no matter what I do, I ...
0
votes
0answers
18 views

How can I use a NFC “connected tag” from Arduino?

I have played with NFC in the past, but those were full blown "NFC readers" based on NXP pn53x chips. I want to know, how would I go about using a so called "Connected tag" from Arduino? For example ...
0
votes
0answers
808 views

ESP8266 - Sending RFID data using NodeMCU (TCP server) problem!

I am trying to send RFID data to an Android app using NodeMCU (ESP8266). Android app is a TCP client socket tester app (Simple TCP Socket Tester) below is the code: #include < ESP8266WiFi.h > #...
-1
votes
2answers
424 views

“Soft WDT reset” stack error: RFID-RC522 with NodeMCU

I have been all over the internet to try and find a solution to this, but after one solid week of intense Google searching I have come up with nothing. What I'm trying to accomplish: I am simply ...
1
vote
1answer
537 views

Arduino Nano wih mfrc522 warning error

UPDATE I have managed to get rid of the WARNING: Communication failure, is the MFRC522 properly connected?. Unfortunately, that did not fix the firmware error it now says 0x80. I have now also tried ...
0
votes
1answer
80 views

Interfacing Aduino Nano and RDM8800

I'm attempting to use an Arduino Nano with the RDM8800 to read data from NFC tags. After soldering wires between the Nano and the RDM8800, I attempted to test these devices using code similar to what ...
0
votes
0answers
53 views

rfid_default_keys with RC522

That's my problem : rfid_default_keys check with RC522 That doesn't work : I did that : if ( ! mfrc522.PICC_IsNewCardPresent()) return false; if ( ! mfrc522.PICC_ReadCardSerial()) ...
0
votes
1answer
334 views

How to send MFRC522 data to a C# app using a NodeMCU TCP server?

I am trying to send MFRC522 data to a C# application through a NodeMCU acting as an access point for the C# app. I have modified the code I got from this site. #include ESP8266WiFi.h> #include SPI....
0
votes
1answer
45 views

Detecting the presence of a specific smartphone [closed]

I would like you to give me some clues about a projet I have: I want to make sure that my little brother's smartphone stays in a shelf overnight and during school hours in order to monitor the time he ...
0
votes
1answer
500 views

RFID + LCD + Arduino Mega 2560 = RFID not printing correctly

My Arduino Mega isn't printing the RFID card's tag it simply prints the card's 2 digits at a time but deletes the previous prints. Can I get help with this? #include <SPI.h> #include <...
1
vote
2answers
314 views

How can I write an integer to a Mifare RFID card using the RFID library?

I'm a beginner to C++ and I'm clearly missing some fundamental knowledge of data types. As such, I'm struggling to adapt the examples in the miguelbalboa/rfid library to my use case. I'm simply trying ...
0
votes
1answer
158 views

How to connect RFID Module to Arduino UNO

I brought 860mhz-960mhz UHF rfid reader module for chip card skimmer from follow link: https://www.alibaba.com/product-detail/860mhz-960mhz-UHF-rfid-reader-module_60312310172.html I want to do ...
0
votes
1answer
1k views

Arduino Nano + RC522 + w5500 Ethernet Module

has anyone had any experience wiring up an arduino nano with an RC522 RFID module and a W5500 ethernet module? i can get each of them to work individually, but i cannot get them to work together. i am ...
0
votes
0answers
209 views

NFC/RFID module multiple cards

I have this NFC module. When i read ONE card at a moment everything works fine, but i need to read more that one cart at a moment. One card lays on a module - module reads it ok, when I move another ...
1
vote
0answers
73 views

Custom RFID and Bluetooth Module [closed]

We have developed a custom board with the RFID Scanner and and a Bluetooth Module built into it. The data from the RFID scanner is supped to be read and sent to Bluetooth built into it and then is ...
1
vote
1answer
408 views

MFRC522 won't detect cards after the first loop

Edit: I have found out that it was something wrong with the cables. I have solved the problem. Thanks for everyone who tried to help. I am working a project that should basically do: Read the RFID ...
0
votes
1answer
91 views

Can I use an Arduino Uno to support an RFID reader, Zigbee module and a touch screen at the same time?

I'm almost a beginner to microcontrollers and have done a few simple projects, but this time I have to use an Arduino Uno (powered by a battery) to support an RFID reader (RC522), a Zigbee module and ...
0
votes
0answers
153 views

My arduino only reads the first card that has been tapped to it

I have been adding cards to the arduino (I tap them then it says "successfully added") but when I tap them after to test if they really are added it says access denied to the system (only the 1st I ...
0
votes
2answers
649 views

Arduino UNO + Ethernet Shield + LCD + RFID but RFID doesn't work

I've been working to a project that uses arduino for RFID but when connected to ethernet shield, the RFID seems to not read any card tapped to sensor but the LCD seems to do fine. Here's the code I ...
0
votes
1answer
83 views

RFID access system with PN532 reader

I have a PN532, so it's capable of both reading and writing. I've used it for a few perfectly functional things, but I want it to authenticate based on the contents (for example 1024 bytes) of a tag. ...
2
votes
1answer
1k views

RFID-RC522 not working, red led is on

I am working with RFID-RC522 and Arduino UNO. I have check pin configurations again and again tried different libraries. It is not reading card and red led on RC522 is consistently on.
1
vote
1answer
182 views

RFID does not respond after Ethernet.begin(mac, ip) initialization

Good day, I have this problem with my simple project. I have a database with all RFID number of employee. What I want to do is to use an rfID to check if it is registered in the database. If it is, it ...
0
votes
0answers
198 views

Powering Nodemcu, Rfid, MG995 using 18650 and charge it simultanueosly

I have a rfid main door lock actuated by mg995 servo(5v) controlled by an nodemcu board Nodemcu 3.3v Mifare rc522 3.3v mg995 Servo 5v I have couple of issues in powering the project, ...
1
vote
1answer
515 views

Connecting multiple boards to Arduino Uno r3

How can I connect the Arduino RFID RC 522 and SD card adapter to one Arduino Uno R3? As each library takes specific pins in Arduino for MOSI, MISO, CLK. So I have conflict in the pins, how can this be ...