const float DIVISOR = 1024 / 110;  // 1024 Schritte * 10mV/°  / 1100mV = 9.31 S/°;
float tempC;
int reading;
int tempPin = 0;

void setup() {
  analogReference(INTERNAL);
}

void loop() {
  reading = analogRead(tempPin);
  tempC = reading / DIVISOR;
}