#define TEMP A0
#define BUZZER 2

const float BETA = 3950;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(TEMP, INPUT);
  pinMode(BUZZER, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int analogValue = analogRead(TEMP);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  if (celsius < 20 && celsius > 10){
    digitalWrite(BUZZER, HIGH);
    tone(BUZZER,262,1000);
    delay(100);
    digitalWrite(BUZZER, LOW);
    noTone(BUZZER);
    delay(100);
  }
  if (celsius < 10){
    digitalWrite(BUZZER, HIGH);
    tone(BUZZER,262,1000);
    delay(10);
  }
  else{
    digitalWrite(BUZZER, LOW);
  }
}