#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

bool showcelciusorfarenhit = false;

#include "DHT.h"

#define DHTPin 4

#define DHTTYPE DHT22

DHT dht(DHTPin, DHTTYPE);

void setup(){
  Serial.begin(115200);
  lcd.init();
  lcd.clear();
  lcd.backlight();

  Serial.println(F("DHTxx test"));

  dht.begin();
}

void loop(){ 
  float h = dht.readHumidity();
  float t = dht.readTemperature(); 
  float f = dht.readTemperature(true); 

  if(isnan(h) || isnan(t) || isnan(f)){
    Serial.println(F(" failed to read from DHT Sensor"));
    return;
  }
 Serial.print("Temperature = ");
 Serial.print(t);
 Serial.print(" ");
 Serial.print((char)176);
 Serial.print("C | ");
 Serial.print((t * 9.0)/5.0 + 32.0); 

Serial.print(" ");
Serial.println("F ");
Serial.print(" Humidity = ");
Serial.print(h);
Serial.println(" % ");
Serial.println(" ");

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

if(showcelciusorfarenhit){
  lcd.print(t);
  lcd.print(" ");
  lcd.print(char(223));
  lcd.print("C ");
  showcelciusorfarenhit = false;
}

else{
  lcd.print((t * 9.0)/5.0 + 32.0);
  lcd.print(" ");
  lcd.print(char(223));
  lcd.print("F ");
  showcelciusorfarenhit = true;
}
lcd.setCursor(0,1);
lcd.print("Humi.: ");
lcd.print(h);
lcd.print("%");

delay(4000);
}