#define numsLeds 9
int tempo=200;
int NumPinLed[numsLeds]={2,3,4,5,6,7,8,9,10};

void setup() {
  for(int i=0;i<numsLeds;i++) 
  {
    pinMode(NumPinLed[i], OUTPUT);
    digitalWrite(NumPinLed[i], LOW); 
  }
}

int indice=0;
void loop() {
  digitalWrite(NumPinLed[indice], HIGH);   
  delay(tempo);                      
  digitalWrite(NumPinLed[indice], LOW); 
  indice++;
  if (indice>=numsLeds) indice=0;  
}