#include <LiquidCrystal_I2C.h>

#include <DHT.h>
#define DHTpin 4         // GPIO pin connected to the DHT22 data pin
#define DHTtype DHT22    // DHT22 sensor type (change to DHT11 for DHT11 sensor)

float tempC = 0;
float tempF = 0;
float humid = 0;

// initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTpin, DHTtype);

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

void loop() {
  tempC = dht.readTemperature();
  tempF = (tempC * 9.0)/5.0 + 32.0; // convert to F
  lcd.setCursor(0,0);
  lcd.print("Temp in C: ");
  lcd.print(tempC);
  lcd.setCursor(0,1);
  lcd.print("Temp in F: ");
  lcd.print(tempF);
  delay(1000);
  lcd.clear();

  humid = dht.readHumidity();
  lcd.setCursor(0,0);
  lcd.print("Humidity: ");
  lcd.print(humid);
  lcd.print("%");
  delay(1000);
  lcd.clear();

  if(isnan(tempC) || isnan(tempF) || isnan(humid)) {
   lcd.clear();
   lcd.setCursor(0, 0);
   lcd.print("Error reading");
   lcd.setCursor(0, 1);
   lcd.print("sensor data");
   delay(2000);
   return;
  }
}