void setup() {
  // put your setup code here, to run once:
  volatile char *dir=0x30;
  *dir=0xFF;

}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *out=0x31;
  //volatile char number[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67};//without dot
  volatile char number[]={0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xE7};//with dot
  volatile long i,count;
  for(count=0;count<10;count++){
    if(count%2==0){
      *out=number[count];
      for(i=0;i<200000;i++);
      *out=0;
      for(i=0;i<200000;i++);
    }
  }
    for(count=9;count>=0;count--){
      if(count%2!=0){
        *out=number[count];
        for(i=0;i<200000;i++);
        *out=0;
        for(i=0;i<200000;i++);
      }
  }

}