dado display

/*  g  f  kc a  b    (pin  0)  ->  a
    |  |  |  |  |   (pin  1)  ->  b
    -------------   (pin  2)  ->  c
    |     a     |   (pin  3)  ->  d
    |    ---    |   (pin  4)  ->  e
    | f | g | b |   (pin  5)  ->  f
    |    ---    |   (pin  6)  ->  g
    | e |   | c |    kc       ->  GND
    |    ---    |    dp       ->  NC
    |     d     |
    -------------
    |  |  |  |  |
    e  d  kc c  dp */
#define pulsante 10
#define a 0
#define b 1
#define c 2
#define d 3
#define e 4
#define f 5
#define g 6
#define dp 7
 // Lookup table per display catodo comune: B0gfedcba
byte lookup_7segmenti_catodocomune[10] = {
  B00111111, B00000110, B01011011, B01001111, B01100110,
  B01101101, B01111101, B00000111, B01111111, B01101111 };
int statopresentepulsante = LOW;
int statoprecedentepulsante = LOW;
int numero;

void setup(){
  pinMode(pulsante, INPUT);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  randomSeed(analogRead(0));
}

void displayWrite(int numero)
{
 for (int i=a; i<=g; i++)
 {
   digitalWrite(i,numero&1);
   numero = numero >> 1;
 }
}


void loop() {
  statopresentepulsante = digitalRead (A0);
  if ((statopresentepulsante == HIGH)&&(statoprecedentepulsante == LOW))
  {
    numero=random(1,7);

  }
  statoprecedentepulsante = statopresentepulsante;
  delay (50);

    displayWrite(lookup_7segmenti_catodocomune[numero]);


}