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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
#define DHTPIN 2
#define DHTTYPE DHT22

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
DHT dht(DHTPIN, DHTTYPE);


void setup() {
  lcd.init();
  lcd.backlight();
  lcd.begin(20, 4);
  Serial.begin(9600);
  
  dht.begin();
}

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

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  lcdMonitor(h, t, f);
}

void lcdMonitor(float h, float t, float f)
{
    lcd.setCursor(0, 0);
    lcd.print("Humidity: ");
    lcd.print(h);
    lcd.setCursor(0, 1);
    lcd.print("Temperature: ");
    lcd.print(t);
    lcd.setCursor(0, 2);
    lcd.print("Temp (F): ");
    lcd.print(f);
}