#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define DHTPIN  3
#define DHTTYPE DHT22
int buzzer=4;
DHT dht(DHTPIN,DHTTYPE);
LiquidCrystal_I2C lcd(0x27,20,4);
void setup() {
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode(buzzer, OUTPUT);
Serial.begin(9600);
}

void loop() {
 float temperature=dht.readTemperature();
 float humidity=dht.readHumidity();
 lcd.setCursor(0 ,0);
 lcd.println("temperature=");
 lcd.print(temperature);
 lcd.println("humidty=");
 lcd.print(humidity);
 lcd.print("%");
 Serial.print("temperature:");
 Serial.println(temperature);

 Serial.print("c humidity:");
 Serial.println(humidity);
 if(temperature>=40){
  digitalWrite(buzzer, HIGH);
  tone(10,100,50);
 }
 else if(humidity>=60){
    digitalWrite(buzzer, HIGH);
  tone(10,100,50);
 }
 else{
  digitalWrite(buzzer, LOW);
  delay(3000);
 }

}