#define latch 12
#define clock 11
#define data 10

byte led1 = 0b11111111;
byte led2 = 0b00000000;

void setup() {
Serial.begin(115200);
pinMode(latch, OUTPUT);
pinMode(clock, OUTPUT);
pinMode(data, OUTPUT);

};

void loop() {
for (int i=0; i<8; i++) {
    digitalWrite(latch, LOW);
    shiftOut(data,clock,MSBFIRST, 1 << i);
    digitalWrite(latch, HIGH);
    delay(500);
 }
    for (int i=6; i>0; i--){
    digitalWrite(latch, LOW);
    shiftOut(data,clock,MSBFIRST, 1 << i);
    digitalWrite(latch, HIGH);
    delay(500);
 }

};