const int BETA = 3950;

void setup() {
  Serial.begin(9600);
  Serial.println("valueSensor\t℃");
}

void loop() {
  int valueSensor  = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / valueSensor - 1)) 
                       / BETA + 1.0 / 298.15) - 273.15;
  Serial.println(String(valueSensor)+"\t"+String(celsius));
  delay(500);
}