int a = 0;
int b = 0;
int i=0;

void setup() {

  for ( i = 2; i < 9; i++)
  {
    pinMode(i, OUTPUT);
  }
  pinMode(12, INPUT);
}

void loop() {
  int x = digitalRead(12);
  if (x == HIGH)
  {

    a = random(1, 7);

    switch (a)
    {
      case 1:
        {
          at();
          digitalWrite(8, HIGH);
          break;
        }
      case 2:
        {
          at();
          digitalWrite(3, HIGH);
          digitalWrite(6, HIGH);
          break;
        }

      case 3:
        {
          at();
          digitalWrite(3, HIGH);
          digitalWrite(6, HIGH);
          digitalWrite(8, HIGH);
          break;
        }
      case 4:
        {
          at();
          digitalWrite(2, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(7, HIGH);
          break;
        }
      case 5:
        {
          at();
          digitalWrite(2, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(7, HIGH);
          digitalWrite(8, HIGH);
          break;
        }
      case 6:
        {
          at();
          digitalWrite(2, HIGH);
          digitalWrite(3, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(6, HIGH);
          digitalWrite(7, HIGH);
          break;
        }
    }

    delay(4000);
    for (int j = 2; j < 9; j++)
    {
      digitalWrite(j, LOW);
    }
  }
  else if(x==LOW)
  {}
}



void at()
{

  for(i=0;i<10;i++)
  {
    b = random(1, 7);
    switch (b)
    {
      case 1:
        {
          digitalWrite(8, HIGH);
          break;
        }
      case 2:
        {
          digitalWrite(3, HIGH);
          digitalWrite(6, HIGH);
          break;
        }

      case 3:
        {
          digitalWrite(3, HIGH);
          digitalWrite(6, HIGH);
          digitalWrite(8, HIGH);
          break;
        }
      case 4:
        {
          digitalWrite(2, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(7, HIGH);
          break;
        }
      case 5:
        {
          digitalWrite(2, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(7, HIGH);
          digitalWrite(8, HIGH);
          break;
        }
      case 6:
        {
          digitalWrite(2, HIGH);
          digitalWrite(3, HIGH);
          digitalWrite(4, HIGH);
          digitalWrite(5, HIGH);
          digitalWrite(6, HIGH);
          digitalWrite(7, HIGH);
          break;
        }
    }
    delay(200);
 

    for (int j = 2; j < 9; j++)
    {
      digitalWrite(j, LOW);
    }
     }
  }