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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int redled = 23;
int startButton = 15;
int buttoncount;
bool normal = false;
int timer = 5;

void setup() {
  pinMode(redled, OUTPUT);
  digitalWrite(redled, HIGH); 
  pinMode(startButton, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(startButton) == LOW) {
    delay(200);
    normal = true;
    Wire.begin();
    lcd.begin(16, 2);
    lcd.setBacklight(HIGH);
    lcd.print("Hello, I2C LCD!");
  }

  if (normal) {
    digitalWrite(redled, LOW);
    delay(500);
    digitalWrite(redled, HIGH);
    delay(500);
    timer--; 

    // Convert timer from seconds to minutes:seconds
    int minutes = timer / 60;
    int seconds = timer % 60;

    // Print the timer value on the LCD in MM:SS format
    lcd.setCursor(0, 1);
    if (minutes < 10) {
      lcd.print("0"); // Add leading zero for minutes < 10
    }
    lcd.print(minutes);
    lcd.print(":");
    if (seconds < 10) {
      lcd.print("0"); // Add leading zero for seconds < 10
    }
    lcd.print(seconds);

    // If the timer reaches 0, stop the normal operation
    if (timer == 0) {
      normal = false;
      lcd.clear();
      lcd.print("Time's up!");
      normal = false;
      lcd.clear();
    }
  }
}