Introduction

This experiment demonstrates how to use an RFID reader and tag to identify and interact with objects. We will use an RFID module to read data from an RFID tag and display the tag's unique identifier on the serial monitor.

Components Needed

• Arduino (e.g., Uno, Nano)
• RFID Reader Module (e.g., RC522)
• RFID Tag
• Jumper wires
• Breadboard (optional)

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Circuit Setup

1. Connect the RFID reader's SDA pin to pin 10 on the Arduino.
2. Connect the CLK pin to pin 13 on the Arduino.
3. Connect the MISO pin to pin 12 on the Arduino.
4. Connect the MOSI pin to pin 11 on the Arduino.
5. Connect the RST pin to pin 9 on the Arduino.
6. Connect the VCC pin to the 3.3V pin on the Arduino.
7. Connect the GND pin to GND on the Arduino.

Ensure the RFID tag is held close to the reader to detect it properly.

Code for RFID Tag Identification

Upload the following code to your Arduino to read RFID tag IDs:

#include 
#include 

#define SS_PIN 10
#define RST_PIN 9

MFRC522 rfid(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(9600);
  SPI.begin();
  rfid.PCD_Init();
}

void loop() {
  if (rfid.PICC_IsNewCardPresent()) {
    if (rfid.PICC_ReadCardSerial()) {
      Serial.print("UID of the card: ");
      for (byte i = 0; i < rfid.uid.size; i++) {
        Serial.print(rfid.uid.uidByte[i], HEX);
        Serial.print(" ");
      }
      Serial.println();
      rfid.PICC_HaltA();
      rfid.PCD_StopCrypto1();
    }
  }
}
            

Explanation

The code reads the unique identifier (UID) from the RFID tag and displays it on the serial monitor. The key parts of the code include:

• MFRC522 rfid(SS_PIN, RST_PIN): Initializes the RFID reader.
• rfid.PICC_IsNewCardPresent(): Checks if a new RFID tag is present.
• rfid.PICC_ReadCardSerial(): Reads the UID of the detected RFID tag.
• The UID is printed to the serial monitor in hexadecimal format.

Troubleshooting

• If the serial monitor shows no output, ensure the RFID reader is connected properly to the Arduino and that the RFID tag is within range.
• If the RFID tag is not detected, try resetting the Arduino or power cycling the RFID reader.
• Make sure you have installed the necessary libraries for the MFRC522 RFID module in the Arduino IDE.