void allOn() {
  for (int i = 0; i < LED_COUNT; ++i) {
    digitalWrite(ledPins[i], HIGH);
  }
}

void alternate() {
  for (int i = 0; i < LED_COUNT; i += 2) {
    digitalWrite(ledPins[i], HIGH);
    delay(100);
    digitalWrite(ledPins[i], LOW);
    delay(100);
  }
}

void blink() {
  for (int i = 0; i < 3; ++i) {
    for (int j = 0; j < LED_COUNT; ++j) {
      digitalWrite(ledPins[j], HIGH);
    }
    delay(300);
    for (int j = 0; j < LED_COUNT; ++j) {
      digitalWrite(ledPins[j], LOW);
    }
    delay(300);
  }
}

void sequence() {
  for (int i = 0; i < LED_COUNT; ++i) {
    digitalWrite(ledPins[i], HIGH);
    delay(300);
    digitalWrite(ledPins[i], LOW);
  }
}