
26.May.2023
NFC (Near Field Communication) is a wireless communication technology that stands for near field communication. NFC enables data transfer between devices over short distances (usually 4 cm or less). This technology makes it easier for electronic devices to interact with each other and exchange information.
NFC is based on radio frequency identification(RFID) technology and more specifically operates at 13.56 MHz. NFC enables two-way communication between an active device (for example, a smartphone) and a passive device (for example, a tag or card).
The usage areas of NFC are quite wide. Here are some examples where NFC is commonly used:
Mobile Payments: NFC technology makes it possible to pay wirelessly via smartphones or other NFC supported devices. This makes it easy to shop at points that support NFC tags or NFC payment systems.
Smart Cards: NFC is used in smart card applications such as secure access control, pass cards, bus tickets, and electronic wallets. NFC-enabled cards can provide authentication or access control by exchanging data.
File and Data Transfer: NFC enables fast sharing of files, photos, videos or contacts between NFC supported devices. This can be accomplished simply by touching or zooming the two devices together.
Bluetooth Pairing: NFC enables fast and easy pairing of Bluetooth devices. It is possible for two devices to detect each other using NFC and then communicate via Bluetooth.
Smart Home Applications: NFC integrates with home automation systems, allowing functions such as home lighting, security systems, media control to be controlled with a simple touch.
NFC is a widely used communication technology today due to its easy use and wide range of applications.
NFC cards or tags usually have a special code number. This code number represents the unique identity of the device and allows it to be recognized by NFC readers.
This code number is called "UID" (Unique Identifier) or "Tag ID". NFC is stored in the memory of the card or tag and transmitted to the reader when the device is read. This UID is permanently assigned during the manufacture of the card or tag and is unique.
The UID usually consists of a series of bytes and may vary with different NFC card or tag types. For example, NFC Forum Type 2tags use a 7-byte UID, while NFC Forum Type 4 cards can have a UID between 4 and 7 bytes.
The UID is used to identify the NFC card or tag and can be used for different functions in various applications. For example, there are usage areas such as recognizing the user in access control systems, defining the account identity in payment systems, or providing product tracking in inventory management.
Besides the UID, other data can be stored on NFC cards or tags. For example, additional memory segments may store information such as user information, private keys, passwords, or application-specific data.
It is possible to write information to NFC cards or tags. Since NFC technology has data writing and reading capabilities, information can be stored on NFC cards or tags.
Writing information to NFC cards or tags is done using a suitable NFC writing device or an NFC supported device. These devices support the software and protocols required for NFC communication.
The information that can be written to an NFC card or tag may vary depending on the application scenario. For example, a website address, a phone number, a text message, or connection information to a Wi-Fi network can be written on an NFC tag.
Information writing is performed after verification that the NFC device is capable of writing. The NFC device reads the existing data by reading the card or tag, then writes to the card or tag with the appropriate commands to write the new information.
The amount of data that can be written will depend on the memory capacity of the NFC card or tag used. Some NFC cards or tags have a smaller memory capacity, while others may offer larger storage.
Information writing is used in many applications of NFC technology. For example, NFC tags can write route information at bus stops, or an NFC card can write payment information and authentication data.
However, information writing is usually performed with limited security measures. Therefore, it is important to assess the security risks and take appropriate protection measures if sensitive data is written to NFC cards or tags.
An Application Example and Codes with PN532 NFC Module
Below are the codes for the application that can be done with Arduino UNO:
#include <Wire.h>
#include <Adafruit_PN532.h>
#define SDA_PIN 10
#define SCL_PIN 11
Adafruit_PN532 nfc(SDA_PIN, SCL_PIN);
void setup(void) {
Serial.begin(115200);
Serial.println("NFC Read Application");
nfc.begin();
uint32_t versiondata=nfc.getFirmwareVersion();
if (!versiondata) {
Serial.print("NFC module not found!");
while(1); // If the module is not found, it breaks the loop.
}
nfc.SAMConfig(); // Configures the NFC module
Serial.println("NFC read ready!");
}
void loop(void) {
uint8_t success;
uint8_t uid[]={ 0, 0, 0, 0, 0, 0, 0 }; // Defines an array for the UID value
uint8_t uidLength; // keeps the length of the UID
success=nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
if (success) {
Serial.println("Card read!");
Serial.print("UID Value: ");
for (uint8_t i=0; i < uidLength; i++) {
Serial.print("0x");
Serial.print(uid[i], HEX);
}
Serial.println("");
delay(1000);
}
}

What is Colpitts oscillator? What are the Working Principles?
Working principles and elements of Colpitts oscillator. Information on electronic circuits, RF applications and frequency generator design
18.10.2023

Frequently used units in electronics
Basic units used in electronics
07.04.2023

Evolution of Bluetooth Technology: Versions After Bluetooth 5.0
Evolution of Bluetooth technology: Versions after Bluetooth 5.0. Faster, safer and more efficient wireless communication.
22.10.2023

Antenna Types
Types of antennas for radio frequency circuits
07.04.2023

Types of Transistors
Transistors, one of the most basic elements of electronic circuits
08.04.2023

Resistor Color Codes
resistor colors, measuring resistance, circuit elements
08.04.2023

2SC3355 Transistor: An Ideal Component for RF Applications
Technical article with detailed information about the 2SC3355 transistor. An ideal component for RF applications and high frequency circuits
26.10.2023

What are the Modulation Types?
Frequencies and modulations
10.04.2023

Learning Microcontroller Chips: Why Is It Necessary?
Learning microcontroller chips, developing electronic projects, working in industrial applications and gaining career opportunities
02.11.2023

Button Cell Types and Standards
Button Battery types and standards
10.04.2023

Quantum Computer: Comparison with Classical Computers
Quantum computers, comparison with quantum computers
04.11.2023

OV7670 CMOS VGA MODULE
Information about the technical specifications and usage areas of the OV7670 CMOS image sensor.
05.11.2023

What is a diode? What are its types and uses?
Basic electronics information, diodes, usage areas of diodes
12.04.2023

What is PCB?
PCB Manufacturing, Design
15.04.2023

What is ESP-IDF?
ESP-IDF is a powerful IoT software development framework developed by Espressif Systems. Offers low-level control and expandability for WiFi and Bluetooth-enabled microcontrollers such as ESP32 and ESP32-S2
19.11.2023

What is Frequency Shift Modulation (FSK)?
In this article, we basically explain FSK, which is one of the modulation types.
20.04.2023

AD9280: Advanced Sampling and Wide Application Areas with High-Speed 8-Bit ADC
The AD9280 is a high-performance ADC at 8-bit, 32 MSPS. Ideal for precise measurements in RF, imaging, automotive and industrial applications
30.11.2023

What is FPGA?
What is FPGA? What are the differences with the CPU? How is it programmed? What applications are FPGAs used in?
22.04.2023

What is PSK (Phase Shift Keying)?
What are the modulation types? Overview of the PSK modulation concept
23.04.2023

What is a Hall Effect Sensor?
Hall effect sensors are used to detect the magnetic field. A simple application example is presented with the A3144 example and Arduino integration.
28.12.2023

What is MOSFET?
Basic information about MOSFET, usage areas
25.04.2023

What is IR LED?
Basic information and applications about IR LEDs, which are very common in electronic systems.
29.04.2023

What is a sensor? What is a transducer?
Types of sensors, types of transducers and their uses
30.04.2023

USB (Universal Serial Bus) Standards
Technical review of USB ports
25.05.2023

IoT and IIoT: Differences and Technologies Used
Discover the differences between IoT and IIoT and the technologies used. While IoT is consumer-focused, IIoT enables efficiencies in industrial processes
08.02.2024

Collecting Data from Multiple Sensors - 74HC4067
This article examines the use of the 74HC4067 chip and its capabilities to collect data from multiple sensors. The 74HC4067 is an analog multiplexer and demultiplexer chip used to route multiple analog signals on a single chip. The article explains the chip's technical features, operating principles and application areas, and highlights how multiple sensors facilitate the data collection process in electronic systems. Accurate capture, conversion and processing of analog data from sensors forms the basis for data-driven decision-making in industrial, scientific and medical applications. This article aims to present effective and precise data collection strategies in electronic systems by addressing methods of collecting data from multiple sensors using the 74HC4067 chip."
07.06.2023

What is Arduino Mega 2560?
A comprehensive article on the Arduino Mega 2560. The technical features, application areas and usage potential of Arduino Mega 2560 are emphasized. With its large input/output pin count, expanded memory capacity and powerful performance, Arduino Mega 2560 meets the needs of users in many projects from robotic projects to industrial automation, from 3D printers to data acquisition systems.
09.06.2023

LoRa Technology
LoRa Technology is a communication technology that is used for long distance wireless communication and does not depend on the internet. LoRa can exchange data between devices by creating its own wireless network. Standing out with its low power consumption and long range features, LoRa is a frequently preferred technology in IoT applications, remote monitoring, sensor networks, smart cities and agricultural applications. LoRa uses unlicensed frequencies and provides direct communication between devices without internet dependency. LoRa modules can provide half-duplex communication and typically operate at frequencies of 433 MHz, 868 MHz, or 915 MHz.
15.06.2023

Voltage Clipper with Zener Diode
Zener diodes: Powerful tools in electronics. In this article, get in-depth information about the function, usage areas and advantages of Zener diodes.
13.03.2024

Wearable Technologies and Sensors (Sensor and Transducers)
Wearable Technologies and Sensors. In this article, learn about the use of wearable technologies and the various sensors and transducers that support them. Discover detailed information about sensors such as motion sensors, heart rate sensors, skin temperature and electrodermal activity sensors, GPS and location sensors, temperature sensors and touch sensors. Learn how wearables are used in health, fitness, safety and more
16.07.2023

Li-Fi: The Future Wireless Communications Technology of Light
Li-Fi technology is a wireless communication technology that can transmit data via light waves. Unlike Wi-Fi, it uses the visible light spectrum and transfers data from LED or other lighting sources with fast flashing signals.
18.07.2023

Filters as Frequency Separation and Cleaning Tools
In this article, learn how filters are an indispensable tool in the electronic world, with their ability to separate and clean signals by frequency.
14.08.2023

What is ASK Modulation?
Amplitude Shift Keying (ASK) is a modulation technique used in communication systems. The amplitude of a carrier signal carrying digital data bits is varied according to the data bits.
14.08.2023

What is Frequency Modulation?
Frequency Modulation (FM) is a method used in communication. Voice or data signals are transmitted by changing the carrier wave frequency.
15.08.2023

What is LoRa-WAN?
What is LoRa-WAN?
19.04.2022

What is E-Commerce?
e-commerce news
23.04.2022

What is Boolean Mathematics?
In the world of digital electronics, Boolean mathematics forms the basis of logical expressions and operations.
20.08.2023

Memory and Controllers: The Role of Flip-Flops in Digital Electronics
Flip-flops are used as memory cells in digital electronics. They provide data storage and control with types such as D type, JK, T type and S-R
26.08.2023

Logic Circuit Elements: Differences Between NOT, Buffer and Schmitt Trigger
Understand the differences between NOT, Buffer and Schmitt Trigger, which are the basic elements in digital logic circuits
28.08.2023

What is T Type Flip Flop?
Toggle logic of T-type flip-flop and complex functions of JK-type flip-flop.
03.09.2023

D Type Flip Flop Ring Counter
What is a ring counter? Rotation counting, use of flip-flops and internal feedback
03.09.2023

Ripple Counter (Asynchronous Counter)
How to count/divide with MOD-16 Ripple counter and T-type flip-flop?
03.09.2023

How Is Frequency Divided? Why Do We Divide?
Learn about the importance and wide application areas of frequency divider circuits used in digital circuits.
04.09.2023

What is solder? What are the types?
What is solder and what are its types? Information about basic components, usage areas and solder paste.
06.09.2023

Communication Standards in Electronics: Connection Fundamentals
Learn about communication standards in electronics: RS-232, USB, Ethernet and more.
07.09.2023

Control Chips: Directive Power of Systems
About chip types and applications: Differences of PLC, PIC, MCU, CPU and more. FPGA, DSP, GPU, ASIC and SoC review.
07.09.2023

Opamp Inverting and Non-Inverting Amplifier Circuits: Basic Principles and Applications
Inverting and non-inverting amplifier circuits related to opamps. Essential components for signal processing
11.09.2023

What is Smart Sensor?
Smart sensor developments and usage areas of smart sensors
13.09.2023

Increasing the Efficiency of Home Heating Systems with Smart NTC Sensors
Information about NTC (Negative Temperature Coefficient) thermistors and their usage areas. Electronics, automotive, medical devices and smart NTCs
15.09.2023

3D Printers: Basic Principles and Applications
This technical article examines the working principles, different types and wide application areas of 3D printers
18.09.2023

What is a MEMS microphone?
How do MEMS microphones work? Usage areas
16.01.2023

What is an Electret Microphone? How does it work?
Power and Design Differences of Electret and Dynamic Microphones
27.09.2023

What is a MEMS microphone?
How do MEMS microphones work? Usage areas
16.01.2023

Colpitts Oscillator
How does the Colpitts Oscillator work?
17.01.2023

Comparison of 4G and 5G Technical Structures
4G and 5G technical structures are compared. The effects of 5G on industrial changes are examined.
27.09.2023

What's the Difference Between Bluetooth 4.0 and Bluetooth 5.0?
Bluetooth 4.0 and Bluetooth 5.0
19.01.2023

Frequency Band Frequency Typical Application
Frequency Band Frequency Typical Application table
20.01.2023

Air Core Coil Calculation
Air Core Coil
22.01.2023

What is IMU Sensor?
IMU Sensor
26.01.2023