How to make a RFID Door Lock

Hi Friends welcome to Akshit Innovation Lab.This blog we are going to see. How to make a RFID Door Lock. Now lets start the blog

Things Needed

12v lock

RFID

jumper wire

Arduino Uno

Led and Buzzer

Breadboard

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CONNECTION PART

Step 1:

Connect RFID pins to jumpers

Step 2:

Connect jumpers to the first four pins. Leave the RTU pin and connect the last three pins again

Step 3:

Take the RFID SDO pin and connect it to the 10th pin of Arduino

Step 4:

Take the RFID SEK pin and connect it to the 13th pin of Arduino

Step 5:

Take the RFID MOSIMI pin and connect it to the 11th pin of Arduino

Step 6:

Take the RFID SOI pin and connect it to the 12th pin of Arduino

Step 7:

Now leave the RQ pin

Step 8:

Connect RFID ground to Arduino Ground

Step 9:

Take the RFID RST pin and connect it to the 9th pin of Arduino

Step 10:

Connect RFID 3.3 volt pin to the Arduino 3.3 volt

Step 11:

Ok now we have to provide the relay connections

Step 12:

Connect relay module's IN1 to the Arduino 3rd pin

Step 13:

Connect relay ground to Arduino ground

Step 14:

Connect relay +5 volt to +5 volt of Arduino

Step 15:

Now get the 12v door lock

Step 16:

Connect the positive wire of 12v door lock to the center pin of the relay

Step 17

Post connecting, tighten the screw in the relay (in the connected area). So that the wire wouldn't slip

Step 18:

Hope you have seen how I tightened the screw after fixing the wire

Step 19:

Now take the 12v female jack. Connect its positive to the NC

Step 20:

Exactly right side to the center pin which we connected in the previous step

Step 21:

Please note the screw of the right side one has to be opened, before the wire is connected

Step 22:

Now you can see the 12 v black wire from adapter. Which is the negative. Connect that negative to the door lock negative (use jumpers as appropriate)

Step 23:

Now we are going to create the security system

Step 24:

Connect Green and Red LED as appropriate

Step 25:

Now connect Red LED negative to the Arduino ground

Step 26:

Now move the pin in bread board a bit. Connect the pin exactly in the same line where Led is connected

Step 27:

Now connect the other end of the pin to the ground of the buzzer which is connected to bread board

Step 28:

Now connect the pin which is available in the backside gap of buzzer to the green led negative

Step 29:

Now the negative side of the power supply is done

Step 30:

Now connect the Arudino 4th pin to the positive of the Red LED

Step 31:

Now connect the Arudino 2nd pin to positive of the buzzer

Step 32:

Now connect the Arudino 5th pin to the positive of the Green LED

Circuit Diagram

CODING PART

Step1:

Now let's go to the coding part

Step 2:

Install Arduino IDE app

Step 3:

Copy paste the code provided in my website into the IDE

Step 4:

Now we need to connect to the right Arduino board

Step 5:

Go to tools menu and select Arduino Uno (as the board)

Step 6:

select tools menu and go to port. Connect to the port which is enclosed in

parenthesis (port number is dynamic)

Step 7:

Now upload the code

Step 8:

The upload process ensures the code is uploaded to the Arduino board

Now you have to understand, for the purpose of demonstrating we have to

enable the tag or card to access the door

When you open the serial monitor, you will be prompted to show the tag/card.

I'm showing the tag. On showing the tag, a code will be shown

Step 9:

Copy that code and overwrite it in the denoted area of the code (in the portion where it is mentioned as change)

Step 10:

After changing click on upload

Remember, since we wanted to enable the card to access the door lock, we have undergone these steps.If you want card to access door, then we need to do these steps in card

Step 11:

Now it is uploaded (see done uploading in the status bar)

Code

//AKSHIT INNOVATION LAB https://www.youtube.com/c/AKSHITSINNOVATIONLAB
//RFID Door Lock
 
#include <SPI.h>
#include <MFRC522.h>
 
#define SS_PIN 10
#define RST_PIN 9
#define LED_G 5 //define green LED pin
#define LED_R 4 //define red LED
#define RELAY 3 //relay pin
#define BUZZER 2 //buzzer pin
#define ACCESS_DELAY 2000
#define DENIED_DELAY 1000
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
 
void setup() 
{
  Serial.begin(9600);   // Initiate a serial communication
  SPI.begin();          // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522
  pinMode(LED_G, OUTPUT);
  pinMode(LED_R, OUTPUT);
  pinMode(RELAY, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  noTone(BUZZER);
  digitalWrite(RELAY, LOW);
  Serial.println("Put your card to the reader...");
  Serial.println();

}
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();
  if (content.substring(1) == "89 B6 64 A3") //change here the UID of the card/cards that you want to give access
  {
    Serial.println("Authorized access");
    Serial.println();
    delay(500);
    digitalWrite(RELAY, HIGH);
    digitalWrite(LED_G, HIGH);
    delay(ACCESS_DELAY);
    digitalWrite(RELAY, LOW);
    digitalWrite(LED_G, LOW);
  }
 
 else   {
    Serial.println(" Access denied");
    digitalWrite(LED_R, HIGH);
    tone(BUZZER, 300);
    delay(DENIED_DELAY);
    digitalWrite(LED_R, LOW);
    noTone(BUZZER);
  }
}