// This tutorial is based on Arduino UNO R3 // and DHT11 Sensor + LCD 16x2 with I2C Board // Enjoy and visit my blog piotrgisworks.blogspot.com

arduino_dht11_1602lcd

/*-----( WELCOME )-----*/
// This tutorial is based on Arduino UNO R3
// and DHT11 Sensor + LCD 16x2 with I2C Board 
// Enjoy and visti my blog piotrgisworks.blogspot.com 
/*-----( Import needed libraries )-----*/
#include <Wire.h>  // Comes with Arduino IDE
#include <dht.h> // Download from https://github.com/adafruit/DHT-sensor-library
// Get the LCD I2C Library here: 
// https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
// Move any other LCD libraries to another folder or delete them
// See Library "Docs" folder for possible commands etc.
#include <LiquidCrystal_I2C.h>

dht DHT;

#define DHT11_PIN 7  //Declare sensor pin on Your Arduino UNO Board 

/*-----( Declare Constants )-----*/
/*-----( Declare objects )-----*/
// set the LCD address to 0x27 for a 16 chars 2 line display
// A FEW use address 0x3F
// Set the pins on the I2C chip used for LCD connections:
//                    addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address

/*-----( Declare Variables )-----*/
//NONE

void setup()   /*----( SETUP: RUNS ONCE )----*/
{

  lcd.begin(16,2);   // initialize the lcd for 16 chars 2 lines, turn on backlight

// ------- Quick 3 blinks of backlight , just for fun  -------------
  for(int i = 0; i< 3; i++)
  {
    lcd.backlight();
    delay(250);
    lcd.noBacklight();
    delay(250);
  }
  lcd.backlight(); // finish with backlight on  

//-------- Write characters on the display ------------------
// NOTE: Cursor Position: (CHAR, LINE) start at 0  
  lcd.setCursor(0,0); 
  lcd.print("Hello, world!"); //Welcome Message 
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("Second Line");
  delay(8000);  // Delay betwen first screen and sensor data 
}  

void loop()   /*----( LOOP: RUNS CONSTANTLY )----*/
// Display Temp and Humidity to LCD 
{
  lcd.clear();
  lcd.setCursor(0,0); //Start at character 0 on line 0
  int chk = DHT.read11(DHT11_PIN);
  lcd.print("Temp: ");
  lcd.print(DHT.temperature); //Read tempreature from DHT11 Sensor 
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);//Start at character 0 on line 1
  lcd.print("Humidity: "); 
  lcd.print(DHT.humidity);//Read humidity from DHT11 Sensor 
  lcd.print("%");
  delay(1000); //Set sensor data refresh time 


}


/* ( THE END ) */