How to make a Rfid id tag to turn on the Motor

       How to create an RFID tag that Activates the motor

...........................................................................Diagram..................................................................

            .................................................................Connection route................................................................

How it Works:

1. Setup:
   • Replace authorizedUID with the UID of your authorized RFID tag.
   • The relay module is connected to RELAY_PIN (pin 8).
2. Motor Control:
   • When the authorized tag is scanned, the motor toggles ON/OFF.
3. UID Detection:
   • The program reads the RFID tag's UID and compares it with authorizedUID.

Wiring:

• RFID Reader:
  • VCC → 3.3V
  • RST → Pin 9
  • GND → GND
  • MISO → Pin 12
  • MOSI → Pin 11
  • SCK → Pin 13
  • SDA → Pin 10
• Relay Module:
• VCC → 5V
• GND → GND
• IN → Pin 8

 ................................................................... Arduino Code.....................................................................

#include <SPI.h>

#include <MFRC522.h>

#define RST_PIN 9   // Reset pin for RFID

#define SS_PIN 10   // Slave Select pin for RFID

#define RELAY_PIN 8 // Pin connected to relay module

MFRC522 rfid(SS_PIN, RST_PIN);

bool motorState = false; // Motor state: false = OFF, true = ON

String authorizedUIDs[] = {"12345678", "87654321"}; // Replace with your two tag UIDs

void setup() {

  Serial.begin(9600);

  SPI.begin();

  rfid.PCD_Init();

  pinMode(RELAY_PIN, OUTPUT);

  digitalWrite(RELAY_PIN, LOW); // Ensure motor is OFF at start

  Serial.println("Place your RFID tag near the reader.");

}

void loop() {

  // Check if a new card is present

  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) {

    return;

  }

  String uid = getUID(); // Get the UID of the scanned tag

  Serial.println("Scanned UID: " + uid);

  if (isAuthorizedTag(uid)) {

    toggleMotor(); // Toggle motor state if UID matches one of the authorized tags

  } else {

    Serial.println("Unauthorized tag!");

  }

  rfid.PICC_HaltA(); // Halt communication with the card

}

// Function to toggle motor state

void toggleMotor() {

  motorState = !motorState; // Flip the motor state

  digitalWrite(RELAY_PIN, motorState ? HIGH : LOW);

  if (motorState) {

    Serial.println("Motor turned ON");

  } else {

    Serial.println("Motor turned OFF");

  }

}

// Function to read the UID from the RFID tag

String getUID() {

  String uid = "";

  for (byte i = 0; i < rfid.uid.size; i++) {

    uid += String(rfid.uid.uidByte[i], HEX);

  }

  uid.toUpperCase();

  return uid;

}

// Function to check if the scanned tag is authorized

bool isAuthorizedTag(String uid) {

  for (String authorizedUID : authorizedUIDs) {

    if (uid == authorizedUID) {

      return true;

    }

  }

  return false;

}

................................................................Full working model............................................................

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