Idea
The Steps
Step 1-Take your breadboard and Arduino
Step 2-Connecting LEDs
Step 3-Connecting the RFID Module
Step 4-Connecting the motor
Step 5-Connecting the OLED Display
Step 6-Including some Libraries
Step 7-Discovering TAG's code
Let's program
Project working

Published June 17, 2022 © GPL3+

Door lock system with Arduino and RFID Module!

Hey! This project shows how to make a door lock system, using Arduino, RFID Module, OLED Display and Stepper Motor.

IntermediateFull instructions provided4,749

Door lock system with Arduino and RFID Module!

Things used in this project

Hardware components

Arduino UNO

Arduino Nano works too!

USB-A to B Cable

To upload the sketch.

RFID Module (Generic)

RFID RC522 Module.

RFID Tags-Card and Coin

Tags to use with RFID Module.

DFRobot Gravity I2C OLED-2864 Display

OLED Display. 4 pins.

28BYJ-28 Stepper Motor 5v

The lock.

ULN2003 Stepper Motor Driver Module

Driver.

5 mm LED: Red

5 mm LED: Green

Resistor 220 ohm

Resistor for LEDs.

Male/Female Jumper Wires

Connections for Modules.

Jumper wires (generic)

Connections for protoboard.

Solderless Breadboard Full Size

Connections for the OLED Display and LEDs.

Software apps and online services

Arduino IDE

Story

Idea

Hello! On this project, I'll show how to make a door lock system using RFID module, stepper motor and OLED display. This all controlled by one Arduino.

The Steps

For this section, you will need to pay attention, because here I'll show the components used and some connections to Arduino.

Step 1-Take your breadboard and Arduino

Using some jumpers, you will connect Arduino's 5v and GND to breadboard, like this:

Connections on breadboard

Step 2-Connecting LEDs

We are going to use now the green and red LEDs, two 220 ohms resistors and jumpers. Check the schematics below:

They are going to be attached from pins 6 to 7.

LED connection

Real life circuit looks like:

Real life circuit

Step 3-Connecting the RFID Module

For the RFID, I will use this module:

RFID Module

How the connections for the RFID module looks like:

SDA- D10

SCK- D13

MOSI- D11

MISO- D12

IRQ- Not used here

GND- GND

RST- D9

3.3v- 3.3v of Arduino

Connections for the module (credits: https://flaviobabos.com.br/rfid-arduino/)

Real life circuit so far:

Real circuit so far

Step 4-Connecting the motor

For the lock, I will use this stepper motor:

28BYJ-48 Stepper Motor

The motor will be attached to the driver like this:

Motor attached to the driver

For driver, I will use this one:

The Stepper Motor driver(ULN2003)

Connections:

IN1-D2 of Arduino

IN2-D3 of Arduino

IN3-D4 of Arduino

IN4-D5 of Arduino

Connect the "-" signal to GND of the Arduino, and "+" to 5v

After that, the circuit will be like:

Everything so far

Step 5-Connecting the OLED Display

This is the OLED Display that we are going to use here:

OLED Display

This OLED Display has a I2C comunication, then, we are going use the analog pins A4 and A5. It supports from 3v to 5v.

SCL - A5 of Arduino

SDA - A4 of Arduino

The circuit now is like that:

Everything connected

Step 6-Including some Libraries

To control the RFID module, we will need one library, you can get it Here, download the.zip file, open the Arduino IDE, go to Sketch >> Include Library >> Add.ZIP library. Then add the rfid-master.zip to Libraries.

To use the OLED Display, we need two libraries. Open your IDE, go to Tools >> Manage Libraries. A new window will be opened.

The library manager

Search for "adafruit ssd1306":

Library

Install the first library. Note that you need another library, that is a dependence, install it too.

Step 7-Discovering TAG's code

Before we start programming the final sketch, we need to get our TAG's code, then you will paste it in the final program. Go to the code section, copy the test program, get the TAG's code, then you will replace in the line where is the TAG's code.

Let's program!

After all these steps, we are ready to go to the IDE and start programming!

Project working

Code

#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() || !rfid.PICC_ReadCardSerial()) 
    return; 
  String content = "";
  byte letra;
  for (byte i = 0; i < rfid.uid.size; i++)
  {
    content.concat(String(rfid.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(rfid.uid.uidByte[i], HEX));
  }
  content.toUpperCase(); //Converts the text to upper case

 
  Serial.print("TAG CODE: "); 
  Serial.println(content); 
 
  rfid.PICC_HaltA(); 
  rfid.PCD_StopCrypto1();
}

//Including Libraries
#include <SPI.h> //SPI Library
#include <Wire.h> //Include the Wire Library
#include <MFRC522.h> //Library of the RFID Module
#include <Stepper.h> //Library for the Stepper Motor
#include <Adafruit_GFX.h> //Library for the OLED Display
#include <Adafruit_SSD1306.h> //Library for the OLED Display
Adafruit_SSD1306 display = Adafruit_SSD1306(); //Creates an object "display", the OLED Display
//Pins used by the RFID Module
#define SS_PIN 10
#define RST_PIN 9
//LED pins
int ledr = 6;
int ledg = 7;
char st[20];
MFRC522 mfrc522(SS_PIN, RST_PIN); //Creates an object "mfrc522", the RFID Module
Stepper myStepper(500, 2, 4, 3, 5); //Creates an object "myStepper", the Stepper motor
void setup() {
  myStepper.setSpeed(60); //Sets Stepper motor speed
  SPI.begin(); //Starts the SPI Library
  mfrc522.PCD_Init(); //Starts the RFID Module
  Wire.begin(); //Starts the Wire library
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //Starts the display
  display.setTextColor(WHITE); //Sets the text color
  display.setTextSize(1); //Sets the text size
  display.clearDisplay(); //Clears the display
  //Defining LEDs as output
  pinMode(ledr, OUTPUT);
  pinMode(ledg, OUTPUT);
}
void loop() {
  display.clearDisplay();
  display.setCursor(5, 1); //Sets the cursor position
  display.print("Approach the TAG"); //Prints the message
  digitalWrite(ledr, HIGH); //Red LED is on
  if ( ! mfrc522.PICC_IsNewCardPresent()) { //RFID module searches for new TAGs
    return;
  }
  if ( ! mfrc522.PICC_ReadCardSerial()) { //Reads the TAG
    return;
  }
  //Decoding the TAG code
  String content = "";
  byte letra;
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  content.toUpperCase(); //Converts the text to upper case
  //The locker system
  if (content.substring(1) == "13 FE 51 3D") { //Change here by the code of your TAG
    display.clearDisplay();
    display.setCursor(10, 1);
    display.print("Authorized access"); //Shows a message on display
    display.display();
    digitalWrite(ledr, LOW);
    digitalWrite(ledg, HIGH); //Green LED turns on
    myStepper.step(-512); //Stepper motor moves
    delay(5000);
    display.clearDisplay();
    display.setCursor(10, 1);
    display.print("Approach the TAG"); 
    display.display();
    digitalWrite(ledr, HIGH); //Red LED turns on again
    digitalWrite(ledg, LOW);
    myStepper.step(512); //Stepper motor moves
  }
  //Acess denied
  else if (content.substring(1) != "13 FE 51 3D") {//Change here too
    display.clearDisplay();
    display.setCursor(10, 1);
    display.print("Access denied");
    display.display();
    delay(500);
    display.clearDisplay();
    display.setCursor(10, 1);
    display.print("Approach the TAG");
    display.display();
  }
}

Credits

bruno_opaiva

6 projects • 4 followers

Door lock system with Arduino and RFID Module!