LCD Button rev_05

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    - Project: LCD Button
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2024-05-03 14:37:09

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* The project must control a timer that starts when */
    /* the infrared sensor is in a low active state and */
    /* stops when the sensor returns to a low active */
    /* state. The timer must be displayed on the LCD */
    /* screen. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* The timer state should be handled using a state */
    /* machine. Furthermore, an explicit function called */
    /* 'resetTimer' needs to be implemented to reset the */
    /* counter and state of the state machine. */
/****** 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);
void loop(void);
void resetTimer(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t sensorInfrared_PushButton_PIN_D2 = 2;

/***** DEFINITION OF I2C PINS *****/
const uint8_t display_LCD1602I2C_I2C_PIN_SDA_A4 = A4;
const uint8_t display_LCD1602I2C_I2C_PIN_SCL_A5 = A5;
const uint8_t display_LCD1602I2C_I2C_SLAVE_ADDRESS = 39;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
LiquidCrystal_I2C lcd(display_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2); // Initialize the LCD object with the I2C address, columns, and rows
EasyButton button(sensorInfrared_PushButton_PIN_D2); // Initialize the EasyButton object with the button pin

// Timer variables
unsigned long startTime = 0;
unsigned long elapsedTime = 0;
bool timerRunning = false;

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(sensorInfrared_PushButton_PIN_D2, INPUT_PULLUP);

    lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
    lcd.backlight(); // Turn on the backlight

    lcd.setCursor(0, 0);
    lcd.print("Hello, world!");

    // Add the EasyButton setup code here
    button.begin();
    button.onPressedFor(2000, onPressedForDuration);
}

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

    // Check the infrared sensor state
    if (digitalRead(sensorInfrared_PushButton_PIN_D2) == LOW) {
        if (!timerRunning) {
            startTime = millis();
            timerRunning = true;
        }
        elapsedTime = millis() - startTime;
        lcd.setCursor(0, 1);
        lcd.print("Timer: ");
        lcd.print(elapsedTime / 1000); // Display elapsed time in seconds
    }
    else {
        resetTimer();
    }
}

// Callback function to be called when the button is pressed.
void onPressedForDuration()
{
    // Code to be executed when the button is pressed for the given duration.
}

// Function to reset the timer and LCD display
void resetTimer()
{
    startTime = 0;
    elapsedTime = 0;
    timerRunning = false;
    lcd.setCursor(0, 1);
    lcd.print("Timer: 0     "); // Clear the timer display
}

/* END CODE */