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- Project: Strongbox
- Source Code compiled for: Arduino Mega
- Source Code created on: 2023-09-17 20:12:25
- Source Code generated by: Tom
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/****** DEFINITION OF LIBRARIES *****/
#include
#include
#include
#include
#include
#include
/****** SYSTEM REQUIREMENT 1 *****/
// This is a project to create a strongbox with a keypad (to enter the code), a display (to show the state of strongbox) and a servo (to lock or unlock the door).
/****** SYSTEM REQUIREMENT 2 *****/
// A code number has to be stored in EEPROM (the value is 3478) and used for comparison with the code provided by user.
/****** SYSTEM REQUIREMENT 3 *****/
// At startup, Arduino has to initialize the display showing "Press digit code of 4 numbers:".
/****** SYSTEM REQUIREMENT 4 *****/
// Periodically the system has to wait the code of 4 numbers from keypad. After each number is introduced, add a '*' character on the second row. When the 4 digits are introduced, check if the code is equal to the value saved in EEPROM.
/****** SYSTEM REQUIREMENT 5 *****/
// Save on EEPROM also the state of machine which is composed of 2 states: "DOOR LOCKED" and "DOOR UNLOCKED".
/****** SYSTEM REQUIREMENT 6 *****/
// If the code is equal to EEPROM value and the state is "DOOR LOCKED", unlock the door: drive the servo to 180 degrees, show on display 'DOOR UNLOCKED' for 2 seconds, and change the state to 'DOOR UNLOCKED'.
/****** SYSTEM REQUIREMENT 7 *****/
// If the state is 'DOOR UNLOCKED', write on the display 'Enter 4 digits to lock the door', then wait for 4 digits on the keypad. And at each digit pressed, display a '*' character on the second row of the display.
/****** SYSTEM REQUIREMENT 8 *****/
// After the 4 digits are entered, change the state from 'DOOR UNLOCKED' to 'DOOR LOCKED', save it in EEPROM, drive the servo to 0 degrees, display 'DOOR LOCKED' for 3 seconds, and save the code in EEPROM.
/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
/***** DEFINITION OF PWM OUTPUT PINS *****/
const uint8_t servo_PIN_D2 = 2;
/***** DEFINITION OF I2C PINS *****/
const uint8_t display_LCD1602I2C_I2C_PIN_SDA_D20 = 20;
const uint8_t display_LCD1602I2C_I2C_PIN_SCL_D21 = 21;
const uint8_t display_LCD1602I2C_I2C_SLAVE_ADDRESS = 39;
// Define the keypad layout
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {30, 31, 32, 33}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {34, 35, 36, 37}; //connect to the column pinouts of the keypad
// Create an instance of Keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
// Create an instance of Servo
Servo doorServo;
// Define the state of the door
enum DoorState {
DOOR_LOCKED,
DOOR_UNLOCKED
};
DoorState doorState = DOOR_LOCKED;
// Define the code length
const int CODE_LENGTH = 4;
// Define the code
const int code[CODE_LENGTH] = {3, 4, 7, 8};
// Define the EEPROM address to store the code
const int CODE_ADDRESS = 0;
// Define the EEPROM address to store the door state
const int STATE_ADDRESS = CODE_ADDRESS + CODE_LENGTH;
// Define the LCD display
LiquidCrystal_I2C lcd(display_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2);
void setup(void)
{
// Initialize the servo pin as output
pinMode(servo_PIN_D2, OUTPUT);
// Attach the servo to the pin
doorServo.attach(servo_PIN_D2);
// Initialize the display
lcd.begin(16, 2);
// Display the initial message
lcd.print("Press digit code");
lcd.setCursor(0, 1);
lcd.print("of 4 numbers:");
// Read the door state from EEPROM
int storedState = EEPROM.read(STATE_ADDRESS);
if (storedState == DOOR_UNLOCKED) {
doorState = DOOR_UNLOCKED;
lcd.clear();
lcd.print("DOOR UNLOCKED");
delay(2000);
}
}
void loop(void)
{
// Check if the door is locked
if (doorState == DOOR_LOCKED) {
// Wait for the code to be entered
displayCodeEntry();
int enteredCode[CODE_LENGTH];
for (int i = 0; i < CODE_LENGTH; i++) {
char key = keypad.waitForKey();
lcd.setCursor(i, 1);
lcd.print("*");
enteredCode[i] = key - '0';
}
// Check if the entered code matches the stored code
bool codeMatch = true;
for (int i = 0; i < CODE_LENGTH; i++) {
if (enteredCode[i] != code[i]) {
codeMatch = false;
break;
}
}
// If the code matches, unlock the door
if (codeMatch) {
unlockDoor();
}
} else if (doorState == DOOR_UNLOCKED) {
// Wait for the code to lock the door
displayCodeConfirmation();
int enteredCode[CODE_LENGTH];
for (int i = 0; i < CODE_LENGTH; i++) {
char key = keypad.waitForKey();
lcd.setCursor(i, 1);
lcd.print("*");
enteredCode[i] = key - '0';
}
// Lock the door and save the code
lockDoor(enteredCode);
}
}
// Function to display the code entry prompt on the LCD
static void displayCodeEntry()
{
lcd.clear();
lcd.print("Enter 4 digits");
lcd.setCursor(0, 1);
lcd.print("to unlock door:");
}
// Function to display the code confirmation prompt on the LCD
static void displayCodeConfirmation()
{
lcd.clear();
lcd.print("Enter 4 digits");
lcd.setCursor(0, 1);
lcd.print("to lock door:");
}
// Function to unlock the door
static void unlockDoor()
{
doorServo.write(180);
lcd.clear();
lcd.print("DOOR UNLOCKED");
delay(2000);
doorState = DOOR_UNLOCKED;
EEPROM.write(STATE_ADDRESS, doorState);
}
// Function to lock the door
static void lockDoor(int enteredCode[])
{
doorServo.write(0);
lcd.clear();
lcd.print("DOOR LOCKED");
delay(3000);
doorState = DOOR_LOCKED;
EEPROM.write(STATE_ADDRESS, doorState);
for (int i = 0; i < CODE_LENGTH; i++) {
EEPROM.write(CODE_ADDRESS + i, enteredCode[i]);
}
}
