void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  byte b = B00000000;
  for( int k=0; k<8; k++ ){
    bitWrite(b,k,1);
    Serial.print(b);
    Serial.print(":");
    for( int i=7; i>=0; i--) {
      Serial.print(bitRead(b,i));
    }
    Serial.println();
    delay(1000);
    Serial.println("-------");
  }
}