int flag = 1;

void setup() 
{
  Serial.begin(9600);
}
void loop() 
{ 
  uint8_t y = 0;
  if (flag == 1)
  { 
    flag = 0;
    for (uint8_t x = 0; x < 255;)
    {
      x++;
      Serial.print(x);
      Serial.print(" = ");
      Serial.print("0B");
      for (int8_t z = 7; z >= 0; z--)
      {
        y = bitRead(x, z);
        delay (1);
        Serial.print(y);
      }
    Serial.println("");
    }
  }
}