#define STR A3
#define DATA A2
#define CLK A4
#define gmb 8

long lastMillis = 0;
long debounceDelay = 200;

void setup() {
  digitalWrite(CLK,LOW);
  digitalWrite(DATA,LOW);
  digitalWrite(STR,LOW);
  pinMode(STR,OUTPUT);
  pinMode(DATA,OUTPUT);
  pinMode(CLK,OUTPUT); 
  pinMode(gmb, INPUT_PULLUP);
  lastMillis = 0;
}


//                                             EDC.BAFG
byte segTable[10] = {0b11101110, 0b00101000, 0b11001101, 0b01101101, 0b00101011,
                     0b01100111, 0b11100111, 0b00101100, 0b11101111, 0b01101111};

                     
int k=0;
int gmbst=1;
void shiftOUT(byte n)
{
   byte bitmask=0x80;
   
   while(bitmask)
   {
      
      if(bitmask & n) digitalWrite(DATA,LOW);
        else digitalWrite(DATA,HIGH);
        
      digitalWrite(CLK,HIGH);
      digitalWrite(CLK,LOW);
      bitmask>>=1;
   }
   digitalWrite(STR,HIGH);
   digitalWrite(STR,LOW);
}

void disp(int n)
{
   shiftOUT(segTable[n]);
}

void loop() {
    
     if(millis() - lastMillis > debounceDelay)
     {
        if(digitalRead(gmb)==0 && gmbst==1)
        {
          disp(k);
          k++;
          if(k==10) k=0;
          gmbst=0;
          lastMillis = millis();
        }
     }
     if(millis() - lastMillis > debounceDelay)
     {
      if(digitalRead(gmb)==1 && gmbst==0)
      lastMillis = millis();
      gmbst=1;
     }
     
        
     
}