void setup() {
  // Setup the digital pin 0-10 as OUTPUT pins using a for loop
  for (int i=0; i<11;i++) {
    pinMode(i, OUTPUT);
  }
}
int tem=0;
void loop() {
  // put your main code here, to run repeatedly:
 switch (tem){
  case 1:
    digitalWrite(1, HIGH);
    break;
  case 2:
    digitalWrite(2, HIGH);
    break;
  case 3:
    digitalWrite(3, HIGH);
    break;
  case 4:
    digitalWrite(4, HIGH);
    break;
  default:
    digitalWrite(10, HIGH);
    break;
 }
 tem++;
 delay(1500);
 
}