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

#define DHTPIN 4
#define DHTTYPE DHT22
#define LCD_COLUMNS 16
#define LCD_LINES 2

#define GREEN 25
#define RED 26 
#define BUZZER 5

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, LCD_COLUMNS, LCD_LINES);

void setup() {
lcd.init();
lcd.backlight();
dht.begin();

pinMode(GREEN, OUTPUT);
pinMode(RED, OUTPUT);
pinMode(BUZZER, OUTPUT);
}

void loop() {
 float temp = dht.readTemperature();
 float hum = dht.readHumidity();

  lcd.setCursor(0,0);
  lcd.print("Temp:");
  lcd.print(temp);
  lcd.print("C");

  lcd.setCursor(0,1);
  lcd.print("Hum: ");
  lcd.print(hum);
  lcd.print("%");

if (temp <=28){
  digitalWrite(GREEN, HIGH);
  digitalWrite(RED, LOW);
  tone(BUZZER, 1000);
}
else {
  digitalWrite(GREEN, LOW);
  digitalWrite(RED, HIGH);
  noTone(BUZZER);
}
}