int tempPin = 0;
void setup()
{
  Serial.begin(9600);
  pinMode(tempPin, INPUT);
}

void loop()
{
  int tempReading = analogRead(tempPin);
  double tempK = log(10000.0 * ((1024.0 / tempReading - 1)));
  tempK = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * tempK * tempK )) * tempK );       //  Temp Kelvin
  float tempC = tempK - 273.15;            // Convert Kelvin to Celcius
  delay(500);
  Serial.println(tempC);
}