#define BETA 3950

float toCelsius(unsigned int analogValue)
{
  return 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
}

float toFahrenheit(unsigned int analogValue)
{
  return toCelsius(analogValue) * 9/5 + 32;
}

float toKelvin(unsigned int analogValue)
{
  return toCelsius(analogValue) + 273.15;
}

void setup() 
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println(String(toCelsius(analogRead(A0))) + char(-15696) + "C");
  Serial.println(String(toFahrenheit(analogRead(A0))) + char(-15696) + "F");
  Serial.println(String(toKelvin(analogRead(A0))) + char(-15696) + "K");
  Serial.println();
  delay(500);
}