#define N_LEDS 8

void setup() {
  for (int pin=0; pin<N_LEDS; pin++) {
    pinMode(pin, OUTPUT);
    digitalWrite(pin, HIGH);
  }
}

#define PERIOD 1000

void triangle(long time) {
  int pinUp = 0;
  int dir = 1;
  long startTime = millis();
  while (millis() - startTime < time) {
    for (int pin=0; pin<N_LEDS; pin++) {
      digitalWrite(pin, (pin == pinUp ? LOW : HIGH));
    }
    if (pinUp == 0)
      dir = 1;
    else if (pinUp == (N_LEDS - 1))
      dir = -1;
    pinUp += dir;
    delayMicroseconds(PERIOD);
  }
}

void lines(long time) {
  int pinUp = 0;
  long startTime = millis();
  while (millis() - startTime < time) {
    for (int pin=0; pin<N_LEDS; pin++) {
      digitalWrite(pin, (pin == pinUp ? LOW : HIGH));
    }
    pinUp = (pinUp + 1) % N_LEDS;
    delayMicroseconds(PERIOD);
  }
}

void circles(long time) {
  char* letters = "SUPERMAN";
  int lettersLength = 8;
  int index = 0;
  long startTime = millis();
  while (millis() - startTime < time) {
    for (int pin=0; pin<N_LEDS; pin++) {
      digitalWrite(pin, ((letters[index] >> pin) & 1 ? LOW : HIGH));
    }
    delay(time / 4 / N_LEDS);
    index = (index + 1) % lettersLength;
  }
}

void loop() {
  triangle(10000);
  lines(10000);
  circles(10000);
}