RFID tagging is an ID system that uses small radio frequency identification devices for identification and tracking purposes. An RFID tagging system includes the tag itself, a read/write device, and a host system application for data collection, processing, and transmission. In simple words an RFID uses electromagnetic fields to transfer data over short distances. RFID is useful to identify people, to make transactions, etc…Lets see how it works.
Components Required
| 1. | Arduino UNO | * 1 |
| 2. | RFID Module(RC522) | * 1 |
| 3. | Jumper Wires | * 1 |
Circuit Diagram
Program
#include <MFRC522.h> // MFRC522 RFID module library.
#include <SPI.h> // SPI device communication library.
#include <EEPROM.h> // EEPROM (memory) library.
#define pinRST 9 // Defines pins for RST, SS conncetions respectively.
#define pinSS 10
byte readCard[4]; // Array that will hold UID of the RFID card.
int successRead;
MFRC522 mfrc522(pinSS, pinRST); // Creates MFRC522 instance.
MFRC522::MIFARE_Key key; // Creates MIFARE key instance.
void setup()
{
Serial.begin(9600); // Starts the serial connection at 9600 baud rate.
SPI.begin(); // Initiates SPI connection between RFID module and Arduino.
mfrc522.PCD_Init(); // Initiates MFRC522 RFID module.
Serial.println("RFID reading process initiated."); // Prints user commands.
Serial.println("Please scan your RFID card to the reader.");
do {
successRead = getID(); // Loops getID library function until reading process is done.
}
while (!successRead);
for ( int i = 0; i < mfrc522.uid.size; i++ ) // You can add multiple cards to read in the for loop.
{
EEPROM.write(i, readCard[i] ); // Saves RFID cards UID to EEPROM.
}
Serial.println("RFID card information is saved to memory.");
}
void loop()
{
getID();
}
int getID() // Function that will read and print the RFID cards UID.
{
if ( ! mfrc522.PICC_IsNewCardPresent()) // If statement that looks for new cards.
{
return;
}
if ( ! mfrc522.PICC_ReadCardSerial()) // If statement that selects one of the cards.
{
return;
}
Serial.print("UID: ");
for (int i = 0; i < mfrc522.uid.size; i++) {
readCard[i] = mfrc522.uid.uidByte[i]; // Reads RFID cards UID.
Serial.print(readCard[i], HEX); // Prints RFID cards UID to the serial monitor.
}
mfrc522.PICC_HaltA(); // Stops the reading process.
}