#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into digital pin 2 on the Arduino
#define ONE_WIRE_BUS 2

long temperature = 0;

// Setup a oneWire instance to communicate with any OneWire device
OneWire oneWire(ONE_WIRE_BUS);	

// Pass oneWire reference to DallasTemperature library
DallasTemperature sensors(&oneWire);

void setup(void)
{
  sensors.begin();	// Start up the library
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop(void)
{ 
  // Send the command to get temperatures
  sensors.requestTemperatures(); 

  //print the temperature in Celsius
  Serial.print("Temperature: ");
  Serial.print(sensors.getTempCByIndex(0));
  Serial.print((char)176);//shows degrees character
  Serial.println("C  |  ");

  temperature = sensors.getTempCByIndex(0);

  delay(500);

  if (temperature < 0) {
    digitalWrite(13, LOW);
    digitalWrite(11, LOW);
    digitalWrite(9, LOW);
  } 
  else {
    if (temperature < 20) {
      digitalWrite(13, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(9, LOW);
    } 
	else {
      if (temperature < 40) {
        digitalWrite(13, HIGH);
        digitalWrite(11, HIGH);
        digitalWrite(9, LOW);
      } 
	  else {
        digitalWrite(13, HIGH);
        digitalWrite(11, HIGH);
        digitalWrite(9, HIGH);
      }
    }
  }


}