====== 电子筛子 ======

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史上最透明电子筛子，代码公开如下：

<code C++>

unsigned char number[16] = {
  //PCDEGFAB 
  0b01110111, //0
  0b01000001, //1
  0b00111011, //2
  0b01101011, //3
  0b01001101, //4
  0b01101110, //5
  0b01111110, //6
  0b01000011, //7
  0b01111111, //8
  0b01101111, //9
  0b00000010,
  0b00000001,
  0b01000000,
  0b00100000,
  0b00010000,
  0b00000100
  };

  void dis_num(unsigned char num){
  for (int i = 0; i < 8; i++){
    digitalWrite(i + 6, !(number[num]&(0x80 >> i)));
  }
}


void setup() {
  // put your setup code here, to run once:
  randomSeed(analogRead(0));
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}
int randNumber = 0;
void loop() {
  if (digitalRead(3) == LOW){
    delay(50);
    if (digitalRead(3) == LOW){
      randNumber = random(6)+1;
    }
    int j = 0;
    while (digitalRead(3) == LOW){
      dis_num(10+j);
      delay(50);
      j++;
      if (j > 5) j = 0;
    }
    dis_num(randNumber);
  }
}

</code>