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先将显示第几个就将对应的com置底，显示最后一位为1 则需要首先将com4 low,com1,2,3,high 即 9 LOW ，10,11,12HIGH 其他显示数字同样 代码如下：

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问题： 为什么第一位不显示？？？
完整代码：

//显示1234
  //设置数据段接口
  int a = 1;//11
  int b = 2;//7
  int c = 3;//4
  int d = 4;//2
  int e = 5;//1
  int f = 6;//10
  int g = 7;//5
  int dp = 8;//3
  //设置位选段接口
  int d4 = 9;//6
  int d3 = 10;//8
  int d2 = 11;//9
  int d1 = 12;//12
  //设置变量
  long n = 1230;
  int x = 100;
  int del = 55;  //此处数值对时钟进行微调
   
  void setup()
  {
    pinMode(d1, OUTPUT);
    pinMode(d2, OUTPUT);
    pinMode(d3, OUTPUT);
    pinMode(d4, OUTPUT);
    pinMode(a, OUTPUT);
    pinMode(b, OUTPUT);
    pinMode(c, OUTPUT);
    pinMode(d, OUTPUT);
    pinMode(e, OUTPUT);
    pinMode(f, OUTPUT);
    pinMode(g, OUTPUT);
    pinMode(dp, OUTPUT);
  }
/////////////////////////////////////////////////////////////
void loop()
{
// Display(1, 1);
 Display(2, 2);
// Display(3, 3);
// Display(4, 4);

}
///////////////////////////////////////////////////////////////
void WeiXuan(unsigned char n)//
{
    switch(n)
     {
  case 1: 
    digitalWrite(d1,LOW);
    digitalWrite(d2, HIGH);
    digitalWrite(d3, HIGH);
    digitalWrite(d4, HIGH);   
   break;
   case 2: 
    digitalWrite(d1, HIGH);
    digitalWrite(d2, LOW);
    digitalWrite(d3, HIGH);
    digitalWrite(d4, HIGH); 
      break;
    case 3: 
      digitalWrite(d1,HIGH);
     digitalWrite(d2, HIGH);
     digitalWrite(d3, LOW);
     digitalWrite(d4, HIGH); 
      break;
    case 4: 
     digitalWrite(d1, HIGH);
     digitalWrite(d2, HIGH);
     digitalWrite(d3, HIGH);
     digitalWrite(d4, LOW); 
      break;
        default :
           digitalWrite(d1, HIGH);
     digitalWrite(d2, HIGH);
     digitalWrite(d3, HIGH);
     digitalWrite(d4, HIGH);
        break;
    }
}
void Num_0()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
  digitalWrite(dp,LOW);
}
void Num_1()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(dp,LOW);
}
void Num_2()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_3()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_4()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_5()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_6()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_7()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(dp,LOW);
}
void Num_8()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Num_9()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp,LOW);
}
void Clear()  //清屏
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(dp,LOW);
}
void pickNumber(unsigned char n)//选数
{
  switch(n)
  {
   case 0:Num_0();
   break;
   case 1:Num_1();
   break;
   case 2:Num_2();
   break;
   case 3:Num_3();
   break;
   case 4:Num_4();
   break;
   case 5:Num_5();
   break;
   case 6:Num_6();
   break;
   case 7:Num_7();
   break;
   case 8:Num_8();
   break;
   case 9:Num_9();
   break;
   default:Clear();
   break; 
  }
}
void Display(unsigned char x, unsigned char Number)//显示x为坐标，Number为数字
{
  WeiXuan(x);
  pickNumber(Number);
 delay(1);
 Clear() ; //消影
}

1 接线图

接线图

/*
 * SevSegFour
 * 驱动四位数码管显示0到9999
 */
#include "SevSeg.h"

SevSeg sevseg;

byte numDigits = 4; //数码管位数
byte digitPins[] = {2, 3, 12, 13}; //数码管公共极连接Arduino的引脚
byte segmentPins[] = {7, 6, 5, 10, 11, 8, 9, 4}; //数码管a,b,c,d,e,f,g,dp对应引脚
byte hardwareConfig = COMMON_CATHODE ; // 共阴极数码管

int numToShow = 0;
int delaycount = 0;

void setup() {
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins); //初始化数码管
}

void loop() {

  delaycount++;
  if (delaycount  == 1000) { //通过变量自加来达到延时效果，如果使用delay函数则会打断数码管显示
    delaycount = 0;
    numToShow++;
  }

  if (numToShow > 9999)
  {
    numToShow = 0;
  }
  
  sevseg.setNumber(numToShow, -1); //设置要显示的数据，不显示小数点
  sevseg.refreshDisplay(); // 必须重复运行刷新数码管显示

}