右2跑外圍aabcddef依續點亮

 unsigned long time1 = 0;

unsigned long time2 = 0;

int seg7_pin[] = {2, 3, 4, 5, 6, 7, 8};

char seg7_table[] = {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xff};

//                  亮a  亮b  亮c  亮d  亮e  亮f

int scan_line[] = {9, 10};

char bcd[] = {6, 6, 6, 6}; //一開機，先清除畫面

int i, j = 0, cnt;

//-----------------------------------------------------------------------------

void setup()

{

  for (i = 0; i < 8; i++)

    pinMode(seg7_pin[i], OUTPUT);//資料端

  for (i = 0; i < 4; i++)

    pinMode(scan_line[i], OUTPUT);//掃瞄端

}

//-------------------------------------------------------------------------------

void outport(byte data)

{

  for (int j = 0; j < 7; j++) {

    if (data % 2 == 1) // 取出 data 的最低位元

      digitalWrite(seg7_pin[j], LOW);

    else

      digitalWrite(seg7_pin[j], HIGH);

    data = data / 2; // 除2，進行下一位元的處理

  }

}

//-----------------------------------------------------------------------------

void loop()

{

  if (millis() - time1 > 5) //超過0.05秒掃瞄scan_line及秀字

  {

    outport(seg7_table[bcd[j]]);

    digitalWrite(scan_line[j], HIGH);

    delay(1);

    digitalWrite(scan_line[j], LOW);

    if (j == 2)//scan_line[0]第9支腳 scan_line[1]第10支腳

      j = 0;//掃瞄是從右到左

    else

      j++;

  }

  if (millis() - time2 > 1000) //超過1秒，計數值加1

  {

    time2 = millis();

    cnt++;

    if (cnt > 7)

      cnt = 0;

  }//兩個七段幾乎同時顯示，因為速度很快

  if (cnt == 0)  { bcd[1] = 0;  bcd[0] = 6 ; }//a 亮(十位數)  a不亮(個位數)  因為點亮是從右2到右1所以index=1先寫，index=0後寫

  if (cnt == 1)  { bcd[1] = 6;  bcd[0] = 0 ; }

  if (cnt == 2)  { bcd[1] = 6;  bcd[0] = 1 ; }

  if (cnt == 3)  { bcd[1] = 6;  bcd[0] = 2 ; }

  if (cnt == 4)  { bcd[1] = 6;  bcd[0] = 3 ; }

  if (cnt == 5)  { bcd[1] = 3;  bcd[0] = 6 ; }

  if (cnt == 6)  { bcd[1] = 4;  bcd[0] = 6 ; }

  if (cnt == 7)  { bcd[1] = 5;  bcd[0] = 6 ; }

}