**Keypad Control** rev_51

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    - Project: **Keypad Control**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-05 07:45:07

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* The servo motor installed in the door will lock or */
    /* unlock based on the correct PIN code received by */
    /* the button. If the door is unlocked and the PIN is */
    /* correct, it will lock. If the door is locked and */
    /* the PIN is correct, it will unlock. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* The webserver provides a web page about lock or */
    /* unlock state of the door. */
/****** END SYSTEM REQUIREMENTS *****/


/********* User code review feedback **********
#### Feedback 1 ####
- add a button which enable the insertion of PIN code.
#### Feedback 2 ####
- i need a physical button to enable pin enter into keypad
********* User code review feedback **********/

/****** DEFINITION OF LIBRARIES *****/
#include <Deneyap_Servo.h>    // Library for controlling servo motors
#include <Keypad.h>           // Library for keypad input
#include <WiFi.h>            // Library for WiFi functionality
#include <WebServer.h>        // Library for web server functionality

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void handleRoot();          // Function to handle root URL

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t keypad_Keypad3x4_R1_PIN_D4 = 4;
const uint8_t keypad_Keypad3x4_R2_PIN_D5 = 5;
const uint8_t keypad_Keypad3x4_R3_PIN_D6 = 6;
const uint8_t keypad_Keypad3x4_R4_PIN_D7 = 7;
const uint8_t buttonPin = 2; // Physical button pin for enabling PIN entry

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t keypad_Keypad3x4_C1_PIN_D8 = 8;
const uint8_t keypad_Keypad3x4_C2_PIN_D9 = 9;
const uint8_t keypad_Keypad3x4_C3_PIN_D10 = 10;

/***** DEFINITION OF PWM OUTPUT PINS *****/
const uint8_t servo_Servomotor_PWMSignal_PIN_D3 = 3;

/***** DEFINITION OF KEYPAD *****/
const uint8_t KEYPAD3X4_ROWS = 4; // four rows
const uint8_t KEYPAD3X4_COLS = 3; // three columns
char Keys_Keypad3x4[KEYPAD3X4_ROWS][KEYPAD3X4_COLS] = {
    {'1', '2', '3'},
    {'4', '5', '6'},
    {'7', '8', '9'},
    {'*', '0', '#'},
};

Keypad keypad = Keypad(makeKeymap(Keys_Keypad3x4), keypad_Keypad3x4_R1_PIN_D4, keypad_Keypad3x4_C1_PIN_D8, KEYPAD3X4_ROWS, KEYPAD3X4_COLS);
Servo myServo; // Servo object

/***** DEFINITION OF VARIABLES *****/
const char* ssid = "your_SSID"; // Your WiFi SSID
const char* password = "your_PASSWORD"; // Your WiFi Password
WebServer server(80); // Create a web server on port 80

bool doorLocked = true; // Initial state of the door
const String correctPIN = "1234"; // Correct PIN code
String inputPIN = ""; // User input PIN
bool pinEntryActive = false; // Flag to indicate if PIN entry is active

void setup(void) {
    Serial.begin(115200); // Start serial communication
    myServo.attach(servo_Servomotor_PWMSignal_PIN_D3); // Attach the servo to the PWM pin
    myServo.write(0); // Initially lock the door

    // Set up keypad pins
    pinMode(keypad_Keypad3x4_R1_PIN_D4, INPUT_PULLUP);
    pinMode(keypad_Keypad3x4_R2_PIN_D5, INPUT_PULLUP);
    pinMode(keypad_Keypad3x4_R3_PIN_D6, INPUT_PULLUP);
    pinMode(keypad_Keypad3x4_R4_PIN_D7, INPUT_PULLUP);
    pinMode(keypad_Keypad3x4_C1_PIN_D8, OUTPUT);
    pinMode(keypad_Keypad3x4_C2_PIN_D9, OUTPUT);
    pinMode(keypad_Keypad3x4_C3_PIN_D10, OUTPUT);
    pinMode(buttonPin, INPUT_PULLUP); // Set button pin as input with pull-up resistor

    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    Serial.println("Connected to WiFi");

    // Set up web server
    server.on("/", handleRoot); // Handle root URL
    server.begin(); // Start the server
}

void loop(void) {
    server.handleClient(); // Handle client requests
    char key = keypad.getKey(); // Get the pressed key

    // Check if the button is pressed to activate PIN entry
    if (digitalRead(buttonPin) == LOW) {
        pinEntryActive = true; // Activate PIN entry mode
        inputPIN = ""; // Reset input
        Serial.println("PIN entry activated. Please enter your PIN.");
        delay(1000); // Debounce delay
    }

    if (key) {
        if (pinEntryActive) {
            if (key == '#') { // If '#' is pressed, check the PIN
                if (inputPIN == correctPIN) {
                    doorLocked = !doorLocked; // Toggle lock state
                    myServo.write(doorLocked ? 0 : 90); // Lock or unlock the door
                    Serial.println("PIN accepted. Door state changed.");
                } else {
                    Serial.println("Incorrect PIN. Try again.");
                }
                pinEntryActive = false; // Deactivate PIN entry
                inputPIN = ""; // Reset input
            } else {
                inputPIN += key; // Append key to input PIN
            }
        }
    }
}

void handleRoot() {
    String message = "Door is currently " + String(doorLocked ? "Locked" : "Unlocked");
    server.send(200, "text/html", message); // Send response to the client
}

/* END CODE */