const int SER=8;
const int LATCH=9;
const int CLK=10;

int light[9]= {0,1,2,4,8,16,32,64,128};
int backLed[9]= {0,1,3,7,15,31,63,127,255};

void setup()
{
pinMode(SER, OUTPUT);
pinMode(LATCH, OUTPUT);
pinMode(CLK, OUTPUT);
digitalWrite(LATCH, LOW);
shiftOut(SER, CLK, MSBFIRST, B10101010);
digitalWrite(LATCH, HIGH);
delay (200);
digitalWrite(LATCH, LOW);
shiftOut(SER, CLK, MSBFIRST, B00000000);
digitalWrite(LATCH, HIGH);
}
void loop()
{
  for (int i= 0; i <9; i++)
  {
    digitalWrite(LATCH, LOW);
    shiftOut(SER, CLK, MSBFIRST, light[i]);
    digitalWrite(LATCH, HIGH);
    delay (200);
  }
for (int i= 9; i >=0; i--)
  {
    digitalWrite(LATCH, LOW);
    shiftOut(SER, CLK, MSBFIRST, light[i]);
    digitalWrite(LATCH, HIGH);
    delay (200);
  }
    for (int i= 0; i <9; i++)
  {
    digitalWrite(LATCH, LOW);
    shiftOut(SER, CLK, MSBFIRST, backLed[i]);
    digitalWrite(LATCH, HIGH);
    delay (200);
  }
for (int i= 9; i >=0; i--)
  {
    digitalWrite(LATCH, LOW);
    shiftOut(SER, CLK, MSBFIRST, backLed[i]);
    digitalWrite(LATCH, HIGH);
    delay (200);
  }
}