RFID and Keypad based door lock

1// Include required libraries
2#include <MFRC522.h>
3#include <LiquidCrystal_I2C.h>
4#include  <Keypad.h>
5#include <Servo.h>
6#include <SPI.h>
7
8// Create instances
9LiquidCrystal_I2C  lcd(0x27, 16, 2);
10MFRC522 mfrc522(10, 9); // MFRC522 mfrc522(SS_PIN, RST_PIN)
11Servo  sg90;
12
13// Initialize Pins for led's, servo and buzzer
14// Blue LED is connected  to 5V
15constexpr uint8_t greenLed = 7;
16constexpr uint8_t redLed = 6;
17constexpr  uint8_t servoPin = 8;
18constexpr uint8_t buzzerPin = 5;
19
20char initial_password[4]  = {'1', '2', '3', '4'};  // Variable to store initial password
21String tagUID  = "change!";  // String to store UID of tag. Change it with your tag's UID
22char  password[4];   // Variable to store users password
23boolean RFIDMode = true; //  boolean to change modes
24char key_pressed = 0; // Variable to store incoming keys
25uint8_t  i = 0;  // Variable used for counter
26
27// defining how many rows and columns  our keypad have
28const byte rows = 4;
29const byte columns = 4;
30
31// Keypad  pin map
32char hexaKeys[rows][columns] = {
33  {'1', '2', '3', 'A'},
34  {'4',  '5', '6', 'B'},
35  {'7', '8', '9', 'C'},
36  {'*', '0', '#', 'D'}
37};
38
39//  Initializing pins for keypad
40byte row_pins[rows] = {A0, A1, A2, A3};
41byte  column_pins[columns] = {2, 1, 0};
42
43// Create instance for keypad
44Keypad  keypad_key = Keypad( makeKeymap(hexaKeys), row_pins, column_pins, rows, columns);
45
46void  setup() {
47  // Arduino Pin configuration
48  pinMode(buzzerPin, OUTPUT);
49  pinMode(redLed, OUTPUT);
50  pinMode(greenLed, OUTPUT);
51
52  sg90.attach(servoPin);  //Declare pin 8 for servo
53  sg90.write(0); // Set initial position at 90 degrees
54
55  lcd.begin();   // LCD screen
56  lcd.backlight();
57  SPI.begin();      // Init  SPI bus
58  mfrc522.PCD_Init();   // Init MFRC522
59
60  lcd.clear(); // Clear  LCD screen
61}
62
63void loop() {
64  // System will first look for mode
65  if (RFIDMode == true) {
66    lcd.setCursor(0, 0);
67    lcd.print("   Door  Lock");
68    lcd.setCursor(0, 1);
69    lcd.print(" Scan Your Tag ");
70
71    // Look for new cards
72    if ( ! mfrc522.PICC_IsNewCardPresent()) {
73      return;
74    }
75
76    // Select one of the cards
77    if ( ! mfrc522.PICC_ReadCardSerial())  {
78      return;
79    }
80
81    //Reading from the card
82    String tag  = "";
83    for (byte j = 0; j < mfrc522.uid.size; j++)
84    {
85      tag.concat(String(mfrc522.uid.uidByte[j]  < 0x10 ? " 0" : " "));
86      tag.concat(String(mfrc522.uid.uidByte[j], HEX));
87    }
88    tag.toUpperCase();
89
90    //Checking the card
91    if (tag.substring(1)  == tagUID)
92    {
93      // If UID of tag is matched.
94      lcd.clear();
95      lcd.print("Tag Matched");
96      digitalWrite(greenLed, HIGH);
97      delay(3000);
98      digitalWrite(greenLed, LOW);
99
100      lcd.clear();
101      lcd.print("Enter  Password:");
102      lcd.setCursor(0, 1);
103      RFIDMode = false; // Make RFID  mode false
104    }
105
106    else
107    {
108      // If UID of tag is not matched.
109      lcd.clear();
110      lcd.setCursor(0, 0);
111      lcd.print("Wrong Tag  Shown");
112      lcd.setCursor(0, 1);
113      lcd.print("Access Denied");
114      digitalWrite(buzzerPin, HIGH);
115      digitalWrite(redLed, HIGH);
116      delay(3000);
117      digitalWrite(buzzerPin, LOW);
118      digitalWrite(redLed, LOW);
119      lcd.clear();
120    }
121  }
122
123  // If RFID mode is false, it will look for keys from keypad
124  if (RFIDMode == false) {
125    key_pressed = keypad_key.getKey(); // Storing  keys
126    if (key_pressed)
127    {
128      password[i++] = key_pressed; // Storing  in password variable
129      lcd.print("*");
130    }
131    if (i == 4) // If  4 keys are completed
132    {
133      delay(200);
134      if (!(strncmp(password,  initial_password, 4))) // If password is matched
135      {
136        lcd.clear();
137        lcd.print("Pass Accepted");
138        sg90.write(90); // Door Opened
139        digitalWrite(greenLed, HIGH);
140        delay(3000);
141        digitalWrite(greenLed,  LOW);
142        sg90.write(0); // Door Closed
143        lcd.clear();
144        i  = 0;
145        RFIDMode = true; // Make RFID mode true
146      }
147      else    // If password is not matched
148      {
149        lcd.clear();
150        lcd.print("Wrong  Password");
151        digitalWrite(buzzerPin, HIGH);
152        digitalWrite(redLed,  HIGH);
153        delay(3000);
154        digitalWrite(buzzerPin, LOW);
155        digitalWrite(redLed,  LOW);
156        lcd.clear();
157        i = 0;
158        RFIDMode = true;  //  Make RFID mode true
159      }
160    }
161  }
162}