const float BETA = 3950;
const float baselineTemp = 20.0;

void setup() {
  pinMode(4,LOW);
}

void loop() {
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println("50℃");
  delay(500);
  if (celsius < baselineTemp){
    digitalWrite(4,LOW);
 }
  else if(celsius >= baselineTemp && celsius < baselineTemp+27){
    digitalWrite(4,HIGH);
    //buzzer sound 
  }
}