LV7

for.ino

int led[] = {6, 7, 8, 9, 10, 11, 12, 13};

int leds() {
  return sizeof(led) / sizeof(int);
}

void setup() {
  for (int i = 0; i < leds(); i++) {
    pinMode(led[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < leds(); i+=2) {
    digitalWrite(led[i], HIGH);
    delay(75);
    digitalWrite(led[i + 2], HIGH);
    digitalWrite(led[i], LOW);
  }

  for (int i = leds(); i >= 0; i-=2) {
    digitalWrite(led[i], HIGH);
    delay(75);
    digitalWrite(led[i - 2], HIGH);
    digitalWrite(led[i], LOW);
  }
}

tipkala.ino

int PIN_SW1 = 11;
int PIN_SW2 = 12;
int PIN_led = 8;

int verifyA = 0;
int verifyB = 0;

int slowdownEffect = 1000;
int slowbuff = slowdownEffect;

void setup() {
  pinMode(PIN_SW1, INPUT_PULLUP);
  pinMode(PIN_SW2, INPUT_PULLUP);
  
  pinMode(PIN_led, OUTPUT);
  
  Serial.begin(9600);
}

void loop() {
  verifyA = digitalRead(PIN_SW1);
  verifyB = digitalRead(PIN_SW2);

  Serial.print("Activation: A - ");
  Serial.print(verifyA);
  Serial.print("\n");
  Serial.print("Activation: B - ");
  Serial.print(verifyB);
  Serial.print("\n");

  if (verifyA == 0 && verifyB == 0) {
    digitalWrite(PIN_led, HIGH);
    Serial.print("Authorisation granted!\n");
  } else {
    digitalWrite(PIN_led, LOW);
    Serial.print("Request terminated!\n");
  }
  
  Serial.print("\n");
}