CODE
// Include required libraries
#include <MFRC522.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#include <SoftwareSerial.h>
#include <Servo.h>
#include <SPI.h>
// Create instances
SoftwareSerial SIM900(3, 4); // SoftwareSerial SIM900(Rx, Tx)
MFRC522 mfrc522(10, 9); // MFRC522 mfrc522(SS_PIN, RST_PIN)
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo sg90;
// Initialize Pins for led's, servo and buzzer
// Blue LED is connected to 5V
constexpr uint8_t greenLed = 7;
constexpr uint8_t redLed = 6;
constexpr uint8_t servoPin = 8;
constexpr uint8_t buzzerPin = 5;
char initial_password[4] = {'1', '2', '3', '4'}; // Variable to store initial password
String tagUID = "29 B9 ED 23"; // String to store UID of tag. Change it with your tag's UID
char password[4]; // Variable to store users password
boolean RFIDMode = true; // boolean to change modes
boolean NormalMode = true; // boolean to change modes
char key_pressed = 0; // Variable to store incoming keys
uint8_t i = 0; // Variable used for counter
// defining how many rows and columns our keypad have
const byte rows = 4;
const byte columns = 4;
// Keypad pin map
char hexaKeys[rows][columns] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
// Initializing pins for keypad
byte row_pins[rows] = {A0, A1, A2, A3};
byte column_pins[columns] = {2, 1, 0};
// Create instance for keypad
Keypad keypad_key = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, rows, columns);
void setup() {
// Arduino Pin configuration
pinMode(buzzerPin, OUTPUT);
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
sg90.attach(servoPin); //Declare pin 8 for servo
sg90.write(0); // Set initial position at 0 degrees
lcd.begin(); // LCD screen
lcd.backlight();
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522
// Arduino communicates with SIM900 GSM shield at a baud rate of 19200
// Make sure that corresponds to the baud rate of your module
SIM900.begin(19200);
// AT command to set SIM900 to SMS mode
SIM900.print("AT+CMGF=1\r");
delay(100);
// Set module to send SMS data to serial out upon receipt
SIM900.print("AT+CNMI=2,2,0,0,0\r");
delay(100);
lcd.clear(); // Clear LCD screen
}
void loop() {
if (NormalMode == false) {
// Function to receive message
receive_message();
}
else if (NormalMode == true) {
// System will first look for mode
if (RFIDMode == true) {
// Function to receive message
receive_message();
lcd.setCursor(0, 0);
lcd.print(" Door Lock");
lcd.setCursor(0, 1);
lcd.print(" Scan Your Tag ");
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
//Reading from the card
String tag = "";
for (byte j = 0; j < mfrc522.uid.size; j++)
{
tag.concat(String(mfrc522.uid.uidByte[j] < 0x10 ? " 0" : " "));
tag.concat(String(mfrc522.uid.uidByte[j], HEX));
}
tag.toUpperCase();
//Checking the card
if (tag.substring(1) == tagUID)
{
// If UID of tag is matched.
lcd.clear();
lcd.print("Tag Matched");
digitalWrite(greenLed, HIGH);
delay(3000);
digitalWrite(greenLed, LOW);
lcd.clear();
lcd.print("Enter Password:");
lcd.setCursor(0, 1);
RFIDMode = false; // Make RFID mode false
}
else
{
// If UID of tag is not matched.
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Wrong Tag Shown");
lcd.setCursor(0, 1);
lcd.print("Access Denied");
digitalWrite(buzzerPin, HIGH);
digitalWrite(redLed, HIGH);
send_message("Someone Tried with the wrong tag \nType 'close' to halt the system.");
delay(3000);
digitalWrite(buzzerPin, LOW);
digitalWrite(redLed, LOW);
lcd.clear();
}
}
// If RFID mode is false, it will look for keys from keypad
if (RFIDMode == false) {
key_pressed = keypad_key.getKey(); // Storing keys
if (key_pressed)
{
password[i++] = key_pressed; // Storing in password variable
lcd.print("*");
}
if (i == 4) // If 4 keys are completed
{
delay(200);
if (!(strncmp(password, initial_password, 4))) // If password is matched
{
lcd.clear();
lcd.print("Pass Accepted");
sg90.write(90); // Door Opened
digitalWrite(greenLed, HIGH);
send_message("Door Opened \nIf it was't you, type 'close' to halt the system.");
delay(3000);
digitalWrite(greenLed, LOW);
sg90.write(0); // Door Closed
lcd.clear();
i = 0;
RFIDMode = true; // Make RFID mode true
}
else // If password is not matched
{
lcd.clear();
lcd.print("Wrong Password");
digitalWrite(buzzerPin, HIGH);
digitalWrite(redLed, HIGH);
send_message("Someone Tried with the wrong Password \nType 'close' to halt the system.");
delay(3000);
digitalWrite(buzzerPin, LOW);
digitalWrite(redLed, LOW);
lcd.clear();
i = 0;
RFIDMode = true; // Make RFID mode true
}
}
}
}
}
// Receiving the message
void receive_message()
{
char incoming_char = 0; //Variable to save incoming SMS characters
String incomingData; // for storing incoming serial data
if (SIM900.available() > 0)
{
incomingData = SIM900.readString(); // Get the incoming data.
delay(10);
}
// if received command is to open the door
if (incomingData.indexOf("open") >= 0)
{
sg90.write(90);
NormalMode = true;
send_message("Opened");
delay(10000);
sg90.write(0);
}
// if received command is to halt the system
if (incomingData.indexOf("close") >= 0)
{
NormalMode = false;
send_message("Closed");
}
incomingData = "";
}
// Function to send the message
void send_message(String message)
{
SIM900.println("AT+CMGF=1"); //Set the GSM Module in Text Mode
delay(100);
SIM900.println("AT+CMGS=\"+XXXXXXXXXXXX\""); // Replace it with your mobile number
delay(100);
SIM900.println(message); // The SMS text you want to send
delay(100);
SIM900.println((char)26); // ASCII code of CTRL+Z
delay(100);
SIM900.println();
delay(1000);
}
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