Smart Door bot System with Keypad, IR Sensor, Servo & Bluetooth

1#include <Keypad.h>
2#include <Servo.h>
3
4Servo lockServo;
5
6#define servoPin 12
7#define irPin 11
8#define ledPin 13
9#define buttonPin 8
10
11const String unlockCode = "171011";
12String enteredCode = "";
13
14bool isLocked = true;
15
16// Keypad Setup
17const byte ROWS = 4;
18const byte COLS = 4;
19char keys[ROWS][COLS] = {
20  {'1','2','3','A'},
21  {'4','5','6','B'},
22  {'7','8','9','C'},
23  {'*','0','#','D'}
24};
25byte rowPins[ROWS] = {A0, A1, A2, A3};
26byte colPins[COLS] = {4, 5, 6, 7};
27
28Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
29
30void setup() {
31  Serial.begin(9600);
32  pinMode(irPin, INPUT);
33  pinMode(ledPin, OUTPUT);
34  pinMode(buttonPin, INPUT_PULLUP);
35  lockServo.attach(servoPin);
36  lockDoor();
37}
38
39void loop() {
40  handleIRSensor();
41  handleKeypad();
42  handleBluetooth();
43  handleButton();
44}
45
46void handleIRSensor() {
47  int sensorValue = digitalRead(irPin);
48  if (sensorValue == LOW && isLocked) {
49    unlockDoor();
50    Serial.println("IR Sensor: Door unlocked from inside.");
51  }
52}
53
54void handleKeypad() {
55  char key = keypad.getKey();
56  if (key) {
57    if (key == '#') {
58      lockDoor();
59      enteredCode = "";
60    } else {
61      enteredCode += key;
62      if (enteredCode.length() >= unlockCode.length()) {
63        if (enteredCode == unlockCode) {
64          unlockDoor();
65          Serial.println("Keypad: Door unlocked.");
66        }
67        enteredCode = "";
68      }
69    }
70  }
71}
72
73void handleBluetooth() {
74  if (Serial.available()) {
75    String btCommand = Serial.readStringUntil('\n');
76    btCommand.trim();
77    if (btCommand == "171011open") {
78      unlockDoor();
79      Serial.println("Bluetooth: Door unlocked.");
80    } else if (btCommand == "171011close") {
81      lockDoor();
82      Serial.println("Bluetooth: Door locked.");
83    }
84  }
85}
86
87void handleButton() {
88  if (digitalRead(buttonPin) == LOW && !isLocked) {
89    lockDoor();
90    Serial.println("Button: Door locked from inside.");
91    delay(500);
92  }
93}
94
95void unlockDoor() {
96  lockServo.write(100);
97  digitalWrite(ledPin, HIGH);
98  isLocked = false;
99}
100
101void lockDoor() {
102  lockServo.write(0);
103  digitalWrite(ledPin, LOW);
104  isLocked = true;
105}