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	- Project: LCD Timer
	- Source Code compiled for: Arduino Mega
	- Source Code created on: 2024-04-04 15:33:53

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* create a 5 minutes timer that starts when i push */
	/* the button and stops when i push it again */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>  // https://github.com/marcoschwartz/LiquidCrystal_I2C
#include <EasyButton.h>  // https://github.com/evert-arias/EasyButton

/****** FUNCTION PROTOTYPES *****/
void setup();
void loop();

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t BUTTON_PIN = 2;

/***** DEFINITION OF I2C PINS *****/
const uint8_t LCD_I2C_PIN_SDA = 20;
const uint8_t LCD_I2C_PIN_SCL = 21;
const uint8_t LCD_I2C_SLAVE_ADDRESS = 39;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
LiquidCrystal_I2C lcd(LCD_I2C_SLAVE_ADDRESS, 20, 4); // Initialize the LiquidCrystal_I2C class instance

EasyButton pushButton(BUTTON_PIN); // Initialize the EasyButton with the button pin

bool timerRunning = false;
unsigned long timerStartTime;
const unsigned long TIMER_DURATION = 5 * 60 * 1000;  // 5 minutes in milliseconds

void onPressedForDuration()
{
  if (timerRunning) {
    // Stop the timer
    unsigned long elapsed = millis() - timerStartTime;
    timerRunning = false;

    // Display the elapsed time on the LCD
    lcd.setCursor(0, 0);
    lcd.print("Elapsed Time: ");
    lcd.setCursor(0, 1);
    lcd.print(elapsed / 1000);
    lcd.print(" seconds");
  } else {
    // Start the timer
    timerStartTime = millis();
    timerRunning = true;

    // Clear the LCD
    lcd.clear();
  }
}

void setup()
{
  // put your setup code here, to run once:

  pushButton.begin(); // Initialize the EasyButton

  pushButton.onPressedFor(2000, onPressedForDuration);  // Add the callback function to be called when the button is pressed for at least the given time.

  lcd.begin(20, 4); // Initialize the LCD

}

void loop()
{
  // put your main code here, to run repeatedly:

  pushButton.read();  // Continuously read the status of the button.

  // Check if the timer has reached the desired duration
  if (timerRunning && millis() - timerStartTime >= TIMER_DURATION) {
    // Stop the timer
    timerRunning = false;

    // Display the timer finished message on the LCD
    lcd.setCursor(0, 0);
    lcd.print("Timer Finished!");
  }
}