const float BETA = 3950; 

void setup() {
  pinMode(11,OUTPUT);
  pinMode (A0,INPUT);
  Serial.begin(9600);
}

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(" ℃");
  if(celsius>=75)
  {
  digitalWrite(11,HIGH);
  }
  if(celsius<75)
  {
  digitalWrite(11,LOW);
}
  delay(1000);
}