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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the I2C address if necessary
#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

double temperature = 0.0;
double gas = 0.0;

int temperaturePin = 8;
int gasPin = A1;
int buzzer = 2;
int triggerLed = 3;

void setup()
{
  Serial.begin(9600);

  pinMode(temperaturePin, INPUT);
  pinMode(gasPin, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(triggerLed, OUTPUT);
  dht.begin();

  lcd.begin(16, 2);

}

void loop()
{
  gas = analogRead(gasPin)/10;
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  

lcd.clear();
 gas = analogRead(gasPin)/10;
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Gas: ");
  lcd.print(gas);
  lcd.print(" ppm");
  checkbuzzer();
 delay(3000);

 lcd.clear();
  gas = analogRead(gasPin)/10;
   lcd.setCursor(0, 0);
  lcd.print("Gas: ");
  lcd.print(gas);
  lcd.print(" ppm");

  lcd.setCursor(0, 1); // Set cursor to the second row
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

checkbuzzer();
 delay(3000);
 lcd.clear();
  lcd.setCursor(0, 0); // Set cursor to the second row
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  checkbuzzer();
 delay(3000);
 


  Serial.println(temperature);

}

void checkbuzzer(){
  gas = analogRead(gasPin)/10;
  if (gas > 50)
  {
    for(int i = 0; i < 2; i++) {
      tone(buzzer, 500);
      digitalWrite(triggerLed, HIGH);
      delay(500); // Adjusted delay to 500 milliseconds
      noTone(buzzer);
      digitalWrite(triggerLed, LOW);
      delay(300); // Adjusted delay to 300 milliseconds
    }
  }
  else
  {
    noTone(buzzer);
    digitalWrite(triggerLed, LOW);
  }
}