int leds[10] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
int buzz = 12;
void setup()
{
  for (int i = 0; i < 10; i++)
  {
    pinMode(leds[i], OUTPUT);
  }
  pinMode(buzz, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  int valor = analogRead(0);
  if (valor==0)
  {    
    digitalWrite(buzz, LOW);
    for (int j=0; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>0 && valor<=100)
  {
    digitalWrite(leds[0], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=1; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>100 && valor<=200)
  {
    digitalWrite(leds[1], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=2; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>200 && valor<=300)
  {
    digitalWrite(leds[2], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=3; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>300 && valor<=400)
  {
    digitalWrite(leds[3], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=4; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>400 && valor<=500)
  {
    digitalWrite(leds[4], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=5; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>500 && valor<=600)
  {
    digitalWrite(leds[5], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=6; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>600 && valor<=700)
  {
    digitalWrite(leds[6], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=7; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>700 && valor<=800)
  {
    digitalWrite(leds[7], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=8; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>800 && valor<=900)
  {
    digitalWrite(leds[8], HIGH);
    digitalWrite(buzz, LOW);
    for (int j=9; j<10; j++)
    {
      digitalWrite(leds[j], LOW);
    }
  }
  if (valor>900)
  {
    digitalWrite(leds[9], HIGH);
    digitalWrite(buzz, HIGH);
    delay(100);
    digitalWrite(buzz, LOW);
  }
  Serial.println(valor);
}