RFID Door Lock

Components

1. Solenoid Electromagnetic Lock
2. Arduino Uno
3. NFC RFID MFRC522 Reader Kit 13.56MHz
4. Switch Drive High-power MOSFET Trigger Module
5. DC Female Power adapter 2.1mm Jack to Screw Terminal Block

Connecting Everything:

First Connect the NFC RFID Reader to Arduino uno.

Second Connect the Solenoid Electromagnetic Lock to the out+ and out- of Switch Drive High Power Mosfet and connect the DC Jack Adapter to in+ and in- of Switch Drive High Power Mosfet

Third Connect the Mosfet to Arduino

Lastly, Connect the 9V Power Adapter to DC Jack Adapter

Schematic Diagram

Codes

#include <SPI.h>
#include <MFRC522.h>
 
#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

int mosfetpin = 7;

void setup() {
   Serial.begin(115200);
   SPI.begin();      // Initiate  SPI bus
   mfrc522.PCD_Init();   // Initiate MFRC522
   Serial.println("Approximate your card to the reader...");
   Serial.println();
   pinMode(mosfetpin,OUTPUT);
}

void loop() {
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent()) 
  {
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial()) 
  {
    return;
  }
  //Show UID on serial monitor
  Serial.print("UID tag :");
  String content= "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++) 
  {
     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : "");
     Serial.print(mfrc522.uid.uidByte[i], HEX);
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : ""));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("Message : ");
  content.toUpperCase();
  String Data = content.substring(1);
  Serial.print("DATA: ");
  Serial.println(Data);

  if (Data == "1BBE6A9") //change here the UID of the card/cards that you want to give access
  {
    Serial.println("Authorized access");
    Serial.println();
    digitalWrite(mosfetpin,HIGH);
    delay(5000);
    digitalWrite(mosfetpin,LOW);
  }
 
 else   {
    Serial.println(" Access denied");
    delay(3000);
  }
  
   Serial.println(" Access denied"); 
}