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

#define DHT_TYPE DHT22 
#define DHT_PIN 27 
#define RED_PIN 12 
#define BLUE_PIN 13 
LiquidCrystal_I2C lcd(0x27,16,2); 
DHT dht(DHT_PIN , DHT_TYPE); 

void initLCD(){ 
  lcd.init(); 
  lcd.backlight(); 
  lcd.clear(); 
  lcd.setCursor(0,0); 
  lcd.print("Starting..."); 
  } 
  
void displayLCD(int col,int row,float temp){ 
  lcd.clear(); 
  lcd.setCursor(col,row); 
  lcd.print(temp); 
    } 
    
    
void interfaceLCD(int col,int row,float hamu){ 
  lcd.setCursor(col,row); 
  lcd.print(hamu); 
  } 
  
void setup() { 
  Serial.begin(115200); 
  dht.begin();
  pinMode(RED_PIN, OUTPUT); 
  pinMode(BLUE_PIN, OUTPUT); 
  initLCD(); } 
  
void loop() { 
  delay(2000); 
  float t = dht.readTemperature();
  float h = dht.readHumidity(); 
  if(isnan(t) || isnan(h)){ 
    Serial.println("Fail to read data form DHT sensor"); 
return; } 

  displayLCD(8 , 0 , t); 
  interfaceLCD(8 , 1 , h ); 
if(t <= 25 || t >= 30){ 
  digitalWrite(RED_PIN, HIGH); 
  digitalWrite(BLUE_PIN, LOW); 
  } 
    
else { digitalWrite(BLUE_PIN, HIGH); 
digitalWrite(RED_PIN, LOW); 

} 
Serial.print("Temperature: "); 
Serial.print(t); 
Serial.print((" / Humidity: ")); 
Serial.print(h); 
}