dip_sw 7seg顯示 0~15

 int seg7[]={2,3,4,5,6,7,8,9};

int dip_sw[]={13,12,11,10};

int weight[]={8,4,2,1};

int num;

int value;

char table_7seg[]=

{

  0xc0,0xf9,0xa4,0xb0,

  0x99,0x92,0x82,0xf8,

  0x80,0x90,0x88,0x83,

  0Xc6,0xa1,0x86,0x8E

};

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

void setup() 

{

  // put your setup code here, to run once:

 for(int i=0;i<8;i++)

 {

  pinMode(seg7[i],OUTPUT);

 }

 for(int i=0;i<4;i++)

 {

  pinMode(dip_sw[i],INPUT);

  digitalWrite(dip_sw[i],HIGH);

 }

}

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

void tx(byte data)

{

  for(int j=0;j<8;j++)

  {

   if(data%2==1)

     digitalWrite(seg7[j],LOW);

   else

     digitalWrite(seg7[j],HIGH);

   data=data/2;

  }

}

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

void loop()

{

  // put your main code here, to run repeatedly:

 num=0;

 for(int k=0;k<4;k++)

 {

  value=digitalRead(dip_sw[k]);

  if(value==HIGH)

    num=num+ weight[k];

 }

 tx(table_7seg[num]);

}