void setup() {
  pinMode(2, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, INPUT);
}

void loop() {
  int ntc = analogRead(13);
  if(ntc >= 2510 && ntc <= 2738) {
    digitalWrite(2, HIGH);
    delay(300);
    digitalWrite(2, LOW);
    delay(300);
  } else if(ntc >= 2278 && ntc <= 2738) {
    digitalWrite(15, HIGH);
    delay(300);
    digitalWrite(15, LOW);
    delay(300);
  } else {
    digitalWrite(15, HIGH);
    tone(12, HIGH);
  }
  Serial.println(ntc);
  delay(1000);
}