int E = 1;
int DB4 = 4;
int DB5 = 5;
int DB6 = 6;
int DB7 = 7;

LiquidCrystal lcd(RS, E, DB4, DB5, DB6, DB7);

void setup()
{
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  lcd.print("Tiempo Restante:");
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("10");
  pinMode(12, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(0, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop()
{
  digitalWrite(12, HIGH);
  digitalWrite(8, HIGH);
  tone(2, 523, 10000); // play tone 60 (C5 = 523 Hz)
  delay(10000); // Wait for 10000 millisecond(s)
  digitalWrite(12, LOW);
  digitalWrite(8, LOW);
  noTone(2);
  digitalWrite(9, HIGH);
  digitalWrite(10, HIGH);
  tone(2, 92, 10000); // play tone 30 (F#2 = 92 Hz)
  delay(10000); // Wait for 10000 millisecond(s)
  digitalWrite(10, LOW);
  noTone(0);
  digitalWrite(11, HIGH);
  tone(2, 165, 3000); // play tone 40 (E3 = 165 Hz)
  delay(3000); // Wait for 3000 millisecond(s)
  digitalWrite(11, LOW);
  digitalWrite(9, LOW);
}