int Led1 = 2;
int Led2 = 3;
int Led3 = 4;
int Led4 = 5;
int Led5 = 6;
int Led6 = 7;
int Led7 = 8;
int Led8 = 9;

int decVal = 0;

int Leds[8] = {Led1, Led2, Led3, Led4, Led5, Led6, Led7, Led8};

void LedDis(int status, int ledNum) {
  if (status == 1) {
    digitalWrite(Leds[ledNum], HIGH);
  } else if (status == 0) {
    digitalWrite(Leds[ledNum], LOW);
  }
}

void decToBinary(int n) {
    int binaryNum[8] = {};

    int i = 0;
    while (n > 0) {
        binaryNum[i] = n % 2;
        n = n / 2;
        i++;
    }

    int bits = 8;
    if ( i > 8 ) {
      bits = 8*((i + 7)/8);
    }
    
    for (int j = bits-1; j >= 0; j--) {
      LedDis(binaryNum[j], j);
      Serial.print(binaryNum[j]); 
    }
    Serial.println();
}

void setup() {
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
  pinMode(Led3, OUTPUT);
  pinMode(Led4, OUTPUT);

  pinMode(Led5, OUTPUT);
  pinMode(Led6, OUTPUT);
  pinMode(Led7, OUTPUT);
  pinMode(Led8, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  decVal = 15;
  decToBinary(decVal);
  delay(500);
  decVal = 35;
  decToBinary(decVal);
  delay(500);
  decVal = 63;
  decToBinary(decVal);
  delay(500);
  
  for (int x = 0; x < 20; x++) {
    decVal += 1;
    decToBinary(decVal);
    delay(500);
  }
}