#define PA 7
#define PB 6
#define PC 5
#define PD 10
#define PE 11
#define PF 8
#define PG 9
#define DP 4

void digital_show(int num){
  if(num<0) num=0;
  if(num>9) num=9;

  for(int i=4;i<=11;i++)
    digitalWrite(i, LOW);

  switch(num){
    case 0:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PE, HIGH);
      digitalWrite(PF, HIGH);      
      break;
    case 1:
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      break;
    case 2:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PE, HIGH);
      digitalWrite(PG, HIGH); 
      break;
    case 3:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PG, HIGH); 
      break;
    case 4:
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PF, HIGH);
      digitalWrite(PG, HIGH); 
      break;   
    case 5:
      digitalWrite(PA, HIGH);
      digitalWrite(PF, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PG, HIGH); 
      break;
    case 6:
      digitalWrite(PA, HIGH);
      digitalWrite(PE, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PG, HIGH); 
      digitalWrite(PF, HIGH);
      break;
    case 7:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      break;
    case 8:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PD, HIGH);
      digitalWrite(PG, HIGH); 
      digitalWrite(PE, HIGH);
      digitalWrite(PF, HIGH);
      break;
    case 9:
      digitalWrite(PA, HIGH);
      digitalWrite(PB, HIGH);
      digitalWrite(PC, HIGH);
      digitalWrite(PF, HIGH);
      digitalWrite(PG, HIGH); 
      digitalWrite(PD, HIGH);
      break;
  }

}

int pflag=0;
int buttonState=0;
void setup() {
  for(int i=4;i<=11;i++)
     pinMode(i, OUTPUT);
     pinMode(2, INPUT);//设置为输入引脚
     Serial.begin(9600);
}

void loop() 
{
Serial.print(".");
buttonState=digitalRead(2);
if(buttonState==HIGH)//按键按下
{
  delay(20);
  buttonState=digitalRead(2);
  if(buttonState==HIGH)//按键按下
  {
   delay(20);
   buttonState=digitalRead(2);
    if(buttonState==HIGH)//按键按下
  {
  pflag=1+pflag;
  Serial.print(pflag);
  }
}
for(int i=4;i<=11;i++)
if(pflag==1){
  digitalWrite(i,HIGH);
}
else{
  digitalWrite(i,LOW);
}
digital_show(pflag);
delay(200);
}
}