Arduino temperature and humidity station with DHT11 and 1602 LCD + I2C shield

DHT11 humidity and temperature sensor is perfect for your electronics projects. i.e. weather stations, home environment control systems, and agricultural/garden monitoring systems. 

The DHT11 is a digital sensor that lets you easily get relative humidity and temperature readings in your projects. First some background information about DHT11DHT11
Technical Specifications:

• Humidity Range: 20-90% RH

• Humidity Accuracy: ±5% RH

• Temperature Range: 0-50 °C

• Temperature Accuracy: ±2% °C

• Operating Voltage: 3V to 5.5V

There is many tutorials how to connect sensor and LCD to your Arduino. My problem was my LCD and specific I2C address that it's used I found my on eBay it's 1602 with MH on the I2C board. 

This little baby use 0x3F I2C Address instead of 0x27 like most of the boards. 

LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

Arduino Sketch

	/*-----( 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 ) */

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