const float BETA = 3950; // should match the Beta Coefficient of the thermistor
const int sensorPin = A0;
const int ledPin = 8; 

int analogValue;
float celsius;

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

void loop() 
{
  analogValue = analogRead(A0);
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  
  if(celsius > 45)
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
}