#include <U8glib.h>

U8GLIB_ST7920_128X64 u8g(13, 11, 12, U8G_PIN_NONE);

void setup(void) {}

void loop(void) {

  int x = 1;
  for (int i = 0; i > -1; i = i + x){
      u8g.drawCircle(i , 32, 10);
      if (i == 128) x = -1;

      u8g.firstPage();
      do {
       u8g.drawCircle ( i , 32 , 10);
      }

      while( u8g.nextPage() );
      delay(50);
  }}