#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 columns, 2 rows

const int buttonPin = 2; 
const int MAX_TIMES = 10; // Maximum number of times to store
unsigned long times[MAX_TIMES]; // Array to store elapsed times
int numTimes = 0; // Number of times stored
int buttonState = 0;
unsigned long startTime = 0;
unsigned long elapsedTime = 0;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  pinMode(buttonPin, INPUT);
}

void loop() {
    buttonState = digitalRead(buttonPin);
    if (buttonState == LOW) {
      printTimes();
    } else if (buttonState == HIGH) {
      if (numTimes < MAX_TIMES) {
        if (startTime == 0) {
          startTime = millis();
          Serial.println("Stopwatch started.");
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Stopwatch started.");
        } else {
          unsigned long currentTime = millis();
          elapsedTime = currentTime - startTime;
          times[numTimes++] = elapsedTime;
          Serial.print("Time ");
          Serial.print(numTimes);
          Serial.print(": ");
          Serial.print(elapsedTime / 1000.0); // Convert milliseconds to seconds
          Serial.println(" seconds");
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Time ");
          lcd.print(numTimes);
          lcd.print(": ");
          lcd.print(elapsedTime / 1000.0); // Convert milliseconds to seconds
          lcd.print(" sec");
          startTime = 0;
        }
      } else {
        Serial.println("Maximum number of times reached.");
      }
    }
  }

void printTimes() {
  Serial.println("All times:");
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("All times:");
  for (int i = 0; i < numTimes; i++) {
    Serial.print("Time ");
    Serial.print(i + 1);
    Serial.print(": ");
    Serial.print(times[i] / 1000.0); // Convert milliseconds to seconds
    Serial.println(" seconds");
    lcd.setCursor(0, i + 1);
    lcd.print("Time ");
    lcd.print(i + 1);
    lcd.print(": ");
    lcd.print(times[i] / 1000.0); // Convert milliseconds to seconds
    lcd.print(" sec");
  }
}