#include <LiquidCrystal_I2C.h>

// Initialize the LCD with I2C address (usually 0x27)
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int startButton = 25; // GPIO for start button
const int stopButton = 26;  // GPIO for stop button

bool isRunning = false;
unsigned long startTime = 0;
unsigned long elapsedTime = 0;

void setup() {
  // Initialize LCD
  lcd.begin();
  lcd.backlight();
  lcd.print("Stopwatch Ready");

  // Configure buttons
  pinMode(startButton, INPUT_PULLDOWN);
  pinMode(stopButton, INPUT_PULLDOWN);

  // Clear LCD after 2 seconds
  delay(2000);
  lcd.clear();
}

void loop() {
  if (digitalRead(startButton) == HIGH) {
    if (!isRunning) {
      isRunning = true;
      startTime = millis();
      lcd.clear();
      lcd.print("Running...");
      delay(300); // Debounce delay
    }
  }

  if (digitalRead(stopButton) == HIGH) {
    if (isRunning) {
      isRunning = false;
      elapsedTime = millis() - startTime;
      lcd.clear();
      lcd.print("Time: ");
      lcd.setCursor(0, 1);
      lcd.print(elapsedTime / 1000); // Convert to seconds
      lcd.print(" sec");
      delay(300); // Debounce delay
    }
  }

  if (isRunning) {
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print((millis() - startTime) / 1000); // Live time in seconds
    lcd.print(" sec");
  }
}