Secure RFID Door Access System Using Arduino and LCD WITH Servo motor.

1#include <SPI.h>
2#include <MFRC522.h>
3#include <Servo.h>
4#include <Wire.h>
5#include <LiquidCrystal_I2C.h>
6
7// Pins
8#define SS_PIN 10
9#define RST_PIN 9
10#define SERVO_PIN 3
11
12// Devices
13MFRC522 rfid(SS_PIN, RST_PIN);
14Servo myServo;
15LiquidCrystal_I2C lcd(0x27, 16, 2);
16
17// Authorized UIDs and names
18const int NUM_USERS = 2;
19
20const String authorizedUIDs[NUM_USERS] = {
21  "AA BB CC DD",  // Replace with actual UID 1
22  "EE FF GG HH"   // Replace with actual UID 2
23};
24
25const String userNames[NUM_USERS] = {
26  "Type your name 1",
27  "Type your name 2"
28};
29
30bool userStatus[NUM_USERS] = {false, false};  // false = outside, true = inside
31
32// Convert UID to string
33String getUID(MFRC522::Uid uid) {
34  String uidStr = "";
35  for (byte i = 0; i < uid.size; i++) {
36    uidStr += String(uid.uidByte[i], HEX);
37    if (i < uid.size - 1) uidStr += " ";
38  }
39  uidStr.toUpperCase();
40  return uidStr;
41}
42
43void setup() {
44  Serial.begin(9600);
45  SPI.begin();
46  rfid.PCD_Init();
47
48  myServo.attach(SERVO_PIN);
49  myServo.write(0);  // Closed
50
51  lcd.init();
52  lcd.backlight();
53  lcd.setCursor(0, 0);
54  lcd.print("Scan your card");
55 
56  }
57
58void loop() {
59  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;
60
61  String scannedUID = getUID(rfid.uid);
62  Serial.print("Scanned UID: ");
63  Serial.println(scannedUID);
64
65  int userIndex = -1;
66  for (int i = 0; i < NUM_USERS; i++) {
67    if (scannedUID == authorizedUIDs[i]) {
68      userIndex = i;
69      break;
70    }
71  }
72
73  lcd.clear();
74
75  if (userIndex != -1) {
76    String userName = userNames[userIndex];
77
78    if (!userStatus[userIndex]) {
79      // Entry
80      lcd.setCursor(0, 0);
81      lcd.print("Welcome,");
82      lcd.setCursor(0, 1);
83      lcd.print(userName);
84      Serial.println("Entry granted to: " + userName);
85      userStatus[userIndex] = true;
86    } else {
87      // Exit
88      lcd.setCursor(0, 0);
89      lcd.print("Thank You,");
90      lcd.setCursor(0, 1);
91      lcd.print(userName);
92      Serial.println("Exit recorded for: " + userName);
93      userStatus[userIndex] = false;
94    }
95
96    myServo.write(87);  // Open
97    delay(3000);
98    myServo.write(0);   // Close
99  } else {
100    lcd.setCursor(0, 0);
101    lcd.print("Access Denied");
102    Serial.println("Unknown UID!");
103    delay(3000);
104  }
105
106  rfid.PICC_HaltA();
107  rfid.PCD_StopCrypto1();
108
109  delay(1000);
110  lcd.clear();
111  lcd.setCursor(0, 0);
112  lcd.print("Scan your card");
113}

1#include <SPI.h>
2#include <MFRC522.h>
3#include <Wire.h>
4#include <LiquidCrystal_I2C.h>
5
6// Pin definitions for RFID
7#define SS_PIN 10
8#define RST_PIN 9
9
10// RFID and LCD setup
11MFRC522 rfid(SS_PIN, RST_PIN);
12LiquidCrystal_I2C lcd(0x27, 16, 2);  // Adjust I2C address if needed
13
14// Function to convert UID to String
15String getUID(MFRC522::Uid uid) {
16  String uidStr = "";
17  for (byte i = 0; i < uid.size; i++) {
18    uidStr += String(uid.uidByte[i], HEX);
19    if (i < uid.size - 1) uidStr += " ";
20  }
21  uidStr = uidStr.toUpperCase(); // make uppercase
22  return uidStr;
23}
24
25void setup() {
26  Serial.begin(9600);
27  SPI.begin();
28  rfid.PCD_Init();
29
30  lcd.init();
31  lcd.backlight();
32  lcd.setCursor(0, 0);
33  lcd.print("Scan your card");
34}
35
36void loop() {
37  // Wait for a card
38  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;
39
40  // Get and display UID
41  String scannedUID = getUID(rfid.uid);
42  Serial.print("Card UID: ");
43  Serial.println(scannedUID);
44
45  lcd.clear();
46  lcd.setCursor(0, 0);
47  lcd.print("Card UID:");
48  lcd.setCursor(0, 1);
49  lcd.print(scannedUID);
50
51  delay(5000);  // Hold message for 5 seconds
52
53  // Reset
54  rfid.PICC_HaltA();
55  rfid.PCD_StopCrypto1();
56  lcd.clear();
57  lcd.setCursor(0, 0);
58  lcd.print("Scan your card");
59}