#define maxleds 8
#define pot A0
int led[maxleds] = {2,3,4,5,6,7,8,9};
void setup ()
{
  Serial.begin(9600);
  for (int i=0;i<maxleds;i++)
  pinMode(led[i],OUTPUT);
}
void loop()
{
  int valor = analogRead(pot);
  int i=map(valor, 0, 1023, 0, 8);
  prender(led[i],100);
  apagar(led[i],100);
  Serial.print(i);
}
void prender(int i, int t)
{
  digitalWrite(i, HIGH);//led esta encendido 5s
  delay(t);
}
void apagar(int i, int t)
{
  digitalWrite(i, LOW);//led esta encendido 5s
  delay(t);
}