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

OneWire oneWire(10);
DallasTemperature sensor(&oneWire);

void setup() {
  pinMode(12, OUTPUT); 
  Serial.begin(9600);
  delay(2);
  sensor.begin();
  delay(20);
}

void loop() {
  sensor.requestTemperatures();
  float t = sensor.getTempCByIndex(0);

  Serial.print("Temperature: ");            Serial.println(t);
  
  if (t > 25.0)     digitalWrite(12, 1); 
   else             digitalWrite(12, 0); 
    
  delay(1000);
}