MPS_Contador

unsigned long contador = 0;

#define bit4   4
#define bit5   5
#define bit6   6
#define bit7   7

#define Com1   8
#define Com2   9
#define Com3   10
#define Com4   11
#define Com5   12
#define Com6   13

byte dig[7];
int j = 0;
//------------------------------
void setup()
{
  Serial.begin(9600);

  pinMode (bit4, OUTPUT);
  pinMode (bit5, OUTPUT);
  pinMode (bit6, OUTPUT);
  pinMode (bit7, OUTPUT);
  pinMode (Com1, OUTPUT);
  pinMode (Com2, OUTPUT);
  pinMode (Com3, OUTPUT);
  pinMode (Com4, OUTPUT);
  pinMode (Com5, OUTPUT);
  pinMode (Com6, OUTPUT);
}
//------------------------------
void loop()
{
  contador++;
  for (int i = 0; i < 6; i++)
  {
    if  ((contador >> (i * 4) & 0x0000000F) == 0x0000000A)  contador = contador + 6 * ( pow(10, i));
  }
  Serial.print("contador "); Serial.println(contador, HEX);

  for (int i = 0; i < 6; i++)
  {
    dig[i] = contador >> (i * 4) & 0x0000000F;
    Serial.print(" digito "); Serial.println(dig[i]);
  }
  digitalWrite(Com1, HIGH);
  Display7Seg();
  j++;
  digitalWrite(Com1, LOW);
  digitalWrite(Com2, HIGH);
  Display7Seg();
  j++;
    digitalWrite(Com2, LOW);
    digitalWrite(Com3, HIGH);
  Display7Seg();
  j++;
    digitalWrite(Com3, LOW);
    digitalWrite(Com4, HIGH);
  Display7Seg();
  j++;
    digitalWrite(Com4, LOW);
    digitalWrite(Com5, HIGH);
  Display7Seg();
  j++;
    digitalWrite(Com5, LOW);
    digitalWrite(Com6, HIGH);
  Display7Seg();
  j=0;
    digitalWrite(Com6, LOW);
  delay(200);
}
//-----------------------------
void   Display7Seg()
{
  digitalWrite(bit4, (dig[j] & 0x08) );
  digitalWrite(bit5, (dig[j] & 0x04) );
  digitalWrite(bit6, (dig[j] & 0x02) );
  digitalWrite(bit7, (dig[j] & 0x01) );
}