/* How to use the DHT-22 sensor with Arduino uno
Temperature and humidity sensor
More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com
*/
//Libraries
#include <DHT.h>
#include <Wire.h>
//#include <lcd.h>
#include <LiquidCrystal_I2C.h>
//Constants
#define DHTPIN 4 // what pin the DHT22 Data is connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
//Variables
int chk;
float hum; //Stores humidity value
float temp; //Stores temperature value
float tempF;
void setup()
{
lcd.init(); // initialize the lcd
lcd.backlight();
lcd.setCursor(0, 0); // move cursor to (0, 0)
lcd.print("Arduino"); // print message at (0, 0)
lcd.setCursor(2, 1); // move cursor to (2, 1)
lcd.print("Booting Up"); // print message at (2, 1)
Serial.begin(9600);
dht.begin();
lcd.begin(16,2);
lcd.init(); // initialize the lcd
lcd.backlight();
}
void loop()
{
delay(2000);
//Read data and store it to variables hum and temp
hum = dht.readHumidity();
temp = dht.readTemperature();
tempF = ((temp * 1.8) + 32);
//Print temp and humidity values to serial monitor
Serial.print("Humidity: ");
Serial.print(hum);
Serial.print(" %, Temp: ");
Serial.print(temp);
Serial.println(" Celsius");
//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(tempF);
lcd.println("Fahrenheit");
delay(2000); //Delay 2 sec between temperature/humidity check
}
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