RFID DOOR JASKIRAT

 

1. RC522 RFID Reader to Arduino Uno:

RC522 Pin	Arduino Uno Pin	Description
SDA	D10	Slave Select (SS) for SPI
SCK	D13	SPI Clock
MOSI	D11	SPI Master Out
MISO	D12	SPI Master In
IRQ	Not connected	Interrupt (not used here)
GND	GND	Ground
RST	D9	Reset Pin
3.3V	3.3V	Power Supply

🛑 Note: RC522 works on 3.3V, do not connect to 5V.

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📌 2. Servo Motor to Arduino Uno:

Servo Wire	Arduino Uno Pin	Description
Signal	D3	PWM control signal
VCC	5V	Power
GND	GND	Ground

CODE:   

#include <SPI.h>

#include <MFRC522.h>

#include <Servo.h>

#define SS_PIN 10     // SDA pin of RC522

#define RST_PIN 9     // RST pin of RC522

#define SERVO_PIN 3   // Servo control pin

MFRC522 rfid(SS_PIN, RST_PIN);  // Create MFRC522 instance

Servo myServo;

// ✅ Your RFID UID

byte authorizedUID[4] = {0xE0, 0x2A, 0x0D, 0x18};

void setup() {

  Serial.begin(9600);

  SPI.begin();          // Init SPI bus

  rfid.PCD_Init();      // Init MFRC522

  myServo.attach(SERVO_PIN);

  myServo.write(0);     // Initial lock position

  Serial.println("RFID Door Lock System Initialized.");

}

void loop() {

  // Check for new RFID card

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

    return;

  Serial.print("Scanned UID: ");

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

    Serial.print(rfid.uid.uidByte[i], HEX);

    Serial.print(" ");

  }

  Serial.println();

  if (isAuthorized(rfid.uid.uidByte)) {

    Serial.println("✅ Access Granted!");

    myServo.write(120);     // Unlock

    delay(3000);           // Keep unlocked for 3 seconds

    myServo.write(0);      // Lock again

  } else {

    Serial.println("❌ Access Denied!");

    // Optional: Add buzzer or red LED here

  }

  rfid.PICC_HaltA();       // Halt PICC

  rfid.PCD_StopCrypto1();  // Stop encryption

}

bool isAuthorized(byte *uid) {

  for (byte i = 0; i < 4; i++) {

    if (uid[i] != authorizedUID[i]) return false;

  }

  return true;

}