int led [6]={5,6,7,8,9,10};
int i;
int x;

// the setup routine runs once when you press reset:
void setup() {
  pinMode(A1, INPUT);
  for(int i=0;i<6;i++)
    pinMode(i, OUTPUT);
}


// the loop routine runs over and over again forever:
void loop() {
x= analogRead(A1);
  i=map(x,0,1023,0,6);
  proceso(i);
}

void proceso(int i)
{

  digitalWrite(led[i], HIGH);   // turn the LED on (HIGH is the voltage level)
  //delay(10);               // wait for a second
  digitalWrite(led[i], LOW);    // turn the LED off by making the voltage LOW
  //delay(50);               // wait for a second
}