int arrayLed [] = {0,1,2,3,4,5,6,7};
int arrayButton [] = {13,12,11,10};
int time = 3000;
int a = 0;

void setup() {
  for(int i = 0; i < 8; i++){
    pinMode(arrayLed[i], OUTPUT); // i++ = i plus 1
  }

  for(int i = 0; i < 4; i++){
    pinMode(arrayButton[i], INPUT); // i++ = i plus 1
  }

 

}

void loop() {
  //int i = 0;
  //digitalWrite(arrayLed[i], HIGH);
  //i +=1;
  




while(digitalRead(arrayLed[7]) == LOW)
  { 

    if(digitalRead(arrayButton[1]))
    {
    //digitalWrite(arrayLed[2], HIGH);
    
    a = a + 1;
      if(a == 5)
      {a = 0;}
    int duur [] = {3000,1500,500,100,10};
    time = duur[a];
      //digitalWrite(arrayLed[1], HIGH);
    
    
    }

    if(digitalRead(arrayButton[2])) //&& digitalRead(arrayLed[0] == LOW))
    {
    
    for(int i = 7; i > -1; i--){
        digitalWrite(arrayLed[i], HIGH); // i++ = i plus 1
        delay(time);
    
    }
    }

    if(digitalRead(arrayButton[0])) //&& digitalRead(arrayLed[0] == LOW))
    {
    
    for(int i = 0; i < 8; i++){
      digitalWrite(arrayLed[i], HIGH); // i++ = i plus 1
      delay(time);
    
    }
    }
  }
  while(digitalRead(arrayLed[0]) == HIGH)
  {
    if(digitalRead(arrayButton[0])) //&& digitalRead(arrayLed[0] == LOW))
    {

      for(int i = 7; i > -1; i--){
        digitalWrite(arrayLed[i], LOW); // i++ = i plus 1
        delay(time);
    }
    }

    if(digitalRead(arrayButton[2])) //&& digitalRead(arrayLed[0] == LOW))
    {

      for(int i = 0; i < 8; i++){
      digitalWrite(arrayLed[i], LOW); // i++ = i plus 1
      delay(time);
    }
  }
  }
}