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

DHT dht (4,DHT22);
LiquidCrystal_I2C lcd (0x27, 16, 2);
int buzzer=2; 
int Redled=5;
int Greenled=18;

float Temperature, Humidity;

void setup (){ 
  pinMode(buzzer, OUTPUT);
  pinMode(Redled, OUTPUT);
  pinMode(Greenled, OUTPUT);
  dht.begin();
  Serial.begin (9600);
  lcd.init();
  lcd.backlight();
}

void loop (){
  Temperature = dht.readTemperature();
  Humidity = dht.readHumidity();
  Serial.print ("T: ");
  Serial.println (Temperature);
  Serial.print ("H: ");
  Serial.println (Humidity);
  
  lcd. setCursor (0,0);
  lcd.print("T: ");
  lcd.print (Temperature);
  lcd.print(" C");
  lcd.setCursor (0,1);
  lcd.print ("H: ");
  lcd.print(Humidity);
  lcd.print(" %");
  
if (Temperature > 30 || Humidity >50){ 
  digitalWrite(buzzer, HIGH);
  digitalWrite(Redled, HIGH);
  digitalWrite(Greenled, LOW);
} else{ 
  digitalWrite(buzzer, LOW);
  digitalWrite(Redled, LOW);
  digitalWrite(Greenled, HIGH);
}
delay (1000);
}