const float BETA = 3950;
int buzzer =4;

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

}

void loop() {
  int sensorValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023./sensorValue-1))/BETA + 1.0 / 298.15) - 273.15;
  Serial.println(celsius);
  delay(1000);

  if(celsius >=40.0){
    tone(buzzer,1000);

  }
  else {
    noTone (buzzer);
  }
}