int pinLED[]={29, 28, 27, 26, 25, 24, 23, 22};
int jmlLED=8;

void setup() {
  // put your setup code here, to run once:
for (int i = 0; i < jmlLED; i++){
  pinMode(pinLED[i], OUTPUT);
}
}

void loop() {
  // put your main code here, to run repeatedly:
for (int i=0;i<jmlLED; i++){
  digitalWrite(pinLED[i], HIGH);
  delay(500);
  digitalWrite(pinLED[i], LOW);
  delay(500);
}
}