const float BETA = 3950;
void setup() {
  Serial.begin(9600);
}
void loop() {
  int analogValue = analogRead(A1);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("B");
  Serial.print(celsius);
  Serial.print("  celsius ");
  delay(2000);
}