#include "DHT.h"
#define DHTPIN 2// you can use 
#define DHTTYPE DHT22//#define DHTTYPE DHT21
                     //#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);//you can also use pins 3, 4, 5, 12, 13 or 14
   // Pin 15 can work but DHT must be disconnected during program upload
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int buzzPin=10;
int Temp;
String readString;
void setup() {
 dht.begin();// initialize the sensor
 lcd.backlight();// turn on lcd backlight
 lcd.init();// initialize lcd
 pinMode(10,OUTPUT);
}
void loop() {
 lcd.clear();
   lcd.setCursor(0,0);// set the cursor on the first row and column
   lcd.print("Humidity=");
   lcd.print((float)dht.readHumidity());//print the humidity
   lcd.print("%");
   lcd.setCursor(0,1);//set the cursor on the second row and first column
   lcd.print("Temp=");
   lcd.print((float)dht.readTemperature());//print the temperature
   lcd.print("Celsius");
   delay(2000);
   lcd.clear();
   if(Temp<40)
   {
      digitalWrite(10,HIGH);
      delay(1000);
   }
}