float temp; //Temperature variable
int LED = 6; //Led digital pin
int buzzerPin = 7; //Buzzer digital pin
const float BETA = 3950; //Beta Coefficient of the thermistor

void setup() {
  //Setup for the buzzer and the LED diode 
  pinMode(buzzerPin,OUTPUT);
  pinMode(LED,OUTPUT); 
  Serial.begin(9600);
}

void loop() {
  //Read the value from the A0 analog pin (pin that the NTC is connected to)
  int analogValue = analogRead(A0);
  //Convert the read value to Celsius degrees
  //This formula has been taken from the official Wokwi documentation
  float temp = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  //Print the current temperature
  Serial.print("Temperatura: ");
  Serial.print(temp);
  Serial.println(" ℃");

  delay(500);

  //Perform the actions of turning on/off the LED and the buzzer, based on the given temperature
  if (temp <= 40) {
    Serial.print("Uključi tihi alarm.");
    digitalWrite(LED, LOW);
    tone(buzzerPin, 1000, 1000);
  } else if (temp > 40 && temp <= 45) {
    Serial.print("Uključi jaki alarm.");
    digitalWrite(LED, LOW);
    tone(buzzerPin, 2000, 1000);
  } else if (temp > 45 && temp <= 50) {
    Serial.print("Uključi crvenu diodu i jak zvučni alarm.");
    digitalWrite(LED, HIGH);
    tone(buzzerPin, 4000, 1000);
  } else if(temp > 50) {
    Serial.println("Ugasi uređaj.");
    digitalWrite(LED, LOW);
    digitalWrite(buzzerPin, LOW);
    while (true);
  }

  delay(500);
  Serial.print("\n-------------------------------------------\n");
}