/* How to use DHT-11 sensor with Arduino uno
Temperature and humidity sensor
Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com */
//Libraries
#include <DHT.h>
//Constants
#define DHTPIN 2 // what pin we're connected to
#define DHTTYPE DHT11 // DHT 11 (AM2302)
// Initialize DHT sensor for normal 16mhz Arduino
DHT dht(DHTPIN, DHTTYPE);
//Variables
int led=13;
int chk;
float hum; //Stores humidity value
float temp; //Stores temperature value
void setup()
{
Serial.begin(9600);
dht.begin();
pinMode(led, OUTPUT);
}
void loop()
{
//Read data and store it to variables hum and temp
hum = dht.readHumidity();
temp= dht.readTemperature();
//Print temp and humidity values to serial monitor
Serial.print("Humidity: ");
Serial.print(hum);
Serial.print(" %, Temp: ");
Serial.print(temp);
Serial.println(" Celsius");
digitalWrite(led, LOW);
if (temp>2)
{
digitalWrite(led, HIGH);
Serial.print("");
Serial.print(" HOT CLIMATE");
}
delay(2000); //Delay 2 sec.
}