int8_t Pin[] = {1,2,3,4,5,6,7,8,9,10};
void setup() {
  for (int i=0; i <=10; i++) {
    pinMode(Pin[i], OUTPUT);
  } 
}
void loop() { 
  for (int i=0; i <=9; i++) {
    digitalWrite(Pin[i], HIGH);
    delay(100);
    digitalWrite(Pin[i], LOW);
  }
  for (int i=9; i >=0; i--) {
    digitalWrite(Pin[i], HIGH);
    delay(100);
    digitalWrite(Pin[i], LOW);
  }
}