#define SelectButton 9       // input op digital pin 9
#define StartButton 8        // input op digital pin 8
#define LED1 7               // output op digital pin 7
#define LED2 6               // output op digital pin 6
#define LED3 5               // output op digital pin 5
#define LED4 4               // output op digital pin 4

bool SelectButton_State;     // true or false
byte SelectButton_Count = 1; // telt van tot 4 dan weer opnieuw
bool StartButton_State;      // true or false



void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);         // tbv debugging
  pinMode (LED1, OUTPUT);     // digital output
  pinMode (LED2, OUTPUT);     // digital output
  pinMode (LED3, OUTPUT);     // digital output
  pinMode (LED4, OUTPUT);     // digital output
  pinMode (SelectButton, INPUT_PULLUP);  // digital input
  pinMode (StartButton, INPUT_PULLUP);   // digital input
}

void loop() {
  // put your main code here, to run repeatedly:

  SelectButton_State = digitalRead(SelectButton);  // read SelectButton
  StartButton_State = digitalRead(StartButton);    // read StartButton
  Serial.print("SelectButton = ");                 // debugging
  Serial.print(SelectButton_State);                // debugging
  Serial.print("  ");                              // debugging
  Serial.print("StartButton = ");                  // debugging
  Serial.println(StartButton_State);               // debugging

 if (SelectButton_State == LOW) {
   Serial.println(SelectButton_Count);
   delay(250); 
   switch(SelectButton_Count) {
     case 1:
      digitalWrite (LED4, LOW);
      digitalWrite (LED1, HIGH);
     break;
     case 2:
      digitalWrite (LED1, LOW);
      digitalWrite (LED2, HIGH);
     break;
     case 3:
     digitalWrite (LED2, LOW);
     digitalWrite (LED3, HIGH);
     break;
     case 4:
      digitalWrite (LED3, LOW);
      digitalWrite (LED4, HIGH);
     break;
    }
   SelectButton_Count ++;
    if(SelectButton_Count > 4) { 
     SelectButton_Count = 1;
    }

  } 
 if (StartButton_State == LOW)  {
   digitalWrite (LED1, LOW);
   digitalWrite (LED2, LOW);
   digitalWrite (LED3, LOW);
   digitalWrite (LED4, LOW);
   delay (250);
  }
}