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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16x2 display

const int lm35Pin = A0; // LM35 sensor pin
const int ledPin = 9; // LED pin
const int buzzerPin = 10; // Buzzer pin
const int resetButtonPin = 7; // Reset button pin

bool alarmActive = false; // Flag to track if the alarm is active

void setup() {
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(resetButtonPin, INPUT_PULLUP);
}

void loop() {
  float tempC = analogRead(lm35Pin) * 0.488; // Convert analog reading to Celsius
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(tempC);
  lcd.print(" C");

  if (tempC > 35.0 && !alarmActive) {
    lcd.setCursor(0, 1);
    lcd.print("WARNING: High Temp");
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000); // Sound the buzzer
    alarmActive = true;
  } else if (tempC <= 35.0 && alarmActive) {
    lcd.setCursor(0, 1);
    lcd.print("                "); // Clear the warning message
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin); // Stop buzzer
    alarmActive = false;
  }

  if (digitalRead(resetButtonPin) == LOW) {
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin); // Stop buzzer
  }

  delay(1000); // Update temperature reading every second
}