byte mask = B01111111;
int Go = 0;
int delaytime = 1000;
int pausetime = 0;
int next = 0;

void setup() {
  for (int i = 4; i <= 10; i++) {
    pinMode(i, OUTPUT);
  }
  pinMode(12, INPUT); //Switch
  DDRD = mask;
}

void loop() {
  bool Read = digitalRead(12);
  int currenttime = millis();
  if (Read == 1) {
    Go++;
  }
  else if (Go >= 2) {
    Go = 0;
    next = next;
    currenttime = currenttime;
  }
  if (Go == 0) {
    next = next;
    currenttime = currenttime;
  }
  if (Go == 1) {
    if (currenttime = delaytime) {
      next++;
      currenttime = currenttime - 999;
      if (next == 1) {
        PORTD = B1000000; //0
      }
      if (next == 2) {
        PORTD = B1111001; //1
      }
      if (next == 3) {
        PORTD = B0100100; //2
      }
      if (next == 4) {
        PORTD = B0110000; //3
      }
      if (next == 5) {
        PORTD = B0011001; //4
      }
      if (next == 6) {
        PORTD = B0010010; //5
      }
      if (next == 7) {
        PORTD = B0000010; //6
      }
      if (next == 8) {
        PORTD = B1111000; //7
      }
      if (next == 9) {
        PORTD = B0000000; //8
      }
      if (next == 10) {
        PORTD = B0010000; //9
      }
      if (next == 11) {
        PORTD = B0001000; //A
      }
      if (next == 12) {
        PORTD = B0000011; //B
      }
      if (next == 13) {
        PORTD = B1000110; //C
      }
      if (next == 14) {
        PORTD = B0100001; //D
      }
      if (next == 15) {
        PORTD = B0000110; //E
      }
      if (next == 16) {
        PORTD = B0001110; //F
      }
      if (next >= 17) {
        next = 0;
      }
    }
  }
}