const float BETA = 3950;
const int sensorPin = A0;
const int ledPin = 8;

 int analogValue;
 float celcius;

void setup() 
{
 pinMode(sensorPin, INPUT);
 pinMode(ledPin, OUTPUT);
 Serial.begin(9600);

}

void loop()
{
 analogValue = analogRead(sensorPin);
 celcius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
 Serial.print("Temperature: ");
 Serial.print(celcius);
 Serial.println(" ℃");

 if(celcius > 45)
 {
    digitalWrite(ledPin, HIGH);
 }
  else
 {
    digitalWrite(ledPin, LOW);
 }
}