int port1[]= {0,1,2,3,4,5,6,7}; //pin1 0-7 dijadikan satu dengan nama port
int port2[]= {7,6,5,4,3,2,1,0}; //pin2 7-0
int jml=8,timer=50,i;

void setup() {
 for (i=0;i<jml;i++){
 pinMode(port1[i], OUTPUT); //biar lebih simpel
 pinMode(port2[i], OUTPUT);
 }
}

void loop() {
 for (i=0;i<jml;i++){
 digitalWrite(port1[i],HIGH);
 delay(timer);
 }
 for(i=0;i<jml;i++){
 digitalWrite(port2[i],LOW);
 delay(timer);
 }
 for(i=0;i<jml;i++){
 digitalWrite(port2[i],HIGH);
 delay(timer);
 }
 for(i=0;i<jml;i++){
 digitalWrite(port1[i],LOW);
 delay(timer);
 }
}