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

#define ONE_WIRE_BUS 2  // Data wire for DS18B20 is plugged into pin 2 on the Arduino

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

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

const int buzzerPin = 7;
const int led1Pin = 8;
const int led2Pin = 9;
const int relayPin = 10; // Relay control pin

const float temperatureThreshold = 30.0; // Temperature threshold in Celsius

void setup() {
  sensors.begin();
  lcd.init();                      // Initialize the LCD
  lcd.backlight();                 // Turn on the backlight

  pinMode(buzzerPin, OUTPUT);
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(relayPin, OUTPUT);       // Set relay pin as output
}

void loop() {
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);
  
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(tempC);
  lcd.print(" C");
  
  if (tempC > temperatureThreshold) {
    digitalWrite(buzzerPin, HIGH); // Turn on the buzzer
    blinkLEDs(); // Blink LEDs
    digitalWrite(relayPin, HIGH); // Turn on the relay
  } else {
    digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
    digitalWrite(led1Pin, LOW);    // Turn off LED1
    digitalWrite(led2Pin, LOW);    // Turn off LED2
    digitalWrite(relayPin, LOW);   // Turn off the relay
  }
  
  delay(1000); // Update temperature reading every second
}

void blinkLEDs() {
  for (int i = 0; i < 5; i++) { // Blink the LEDs 5 times
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, HIGH);
    delay(500);
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
    delay(500);
  }
}