/* DHT-22 sensor with I2C 16x2 LCD with Arduino uno
   Temperature and humidity sensor displayed on LCD
   Based on: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html 
   and https://www.ardumotive.com/i2clcden.html for the I2C LCD library 
   by Michalis Vasilakis
   Recompiled by adhitadhitadhit
   Notes: Use the LCD I2C Library from the link above. 
*/

#include <dht.h> // Library for DHT sensor
#include <LiquidCrystal_I2C.h> // LCD library for I2C
#include <Wire.h> 

dht DHT;

// Constants
#define DHT22_PIN 2 // DHT 22 (AM2302) - pin used for DHT22 
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

// Variables
float hum;  // Stores humidity value
float temp; // Stores temperature value

void setup() {
    Serial.begin(9600);
    lcd.init();                   // Initialize the LCD 
    lcd.backlight();             // Turn on the backlight
}

void loop() {
    int chk = DHT.read22(DHT22_PIN);
    // Read data and store it to variables hum and temp
    hum = DHT.humidity;
    temp = DHT.temperature;

    // Print temp and humidity values to LCD
    lcd.setCursor(0, 0);
    lcd.print("Humidity: ");
    lcd.print(hum);
    lcd.print("%");
    
    lcd.setCursor(0, 1);
    lcd.print("Temp: "); 
    lcd.print(temp);
    lcd.print(" C"); // "C" for Celsius
    delay(2000); // Delay 2 sec between temperature/humidity check
}