int LED[8]={2,3,4,5,6,7,8,9};
int tempo = 200;
void setup() 
{
  for(int i=0;1<8;i++)
  {
    pinMode(LED[i],OUTPUT);
  }
  Serial.begin(115200);
}

void loop() 
{
  for(int i=0;i<8;i++)
  {
    digitalWrite(LED[i], HIGH);
    delay(tempo);
    Serial.print("Acende LED: "+ (i+1));
    digitalWrite(LED[i],LOW);
    delay(tempo);
  }
  for(int i=6;i>0;i--)
  {
    digitalWrite(LED[i], HIGH);
    delay(tempo);
    digitalWrite(LED[i],LOW);
    delay(tempo);
  
}