const int AANTALLAMPJES = 4;
const int PIN_ROOD = 13;
const int PIN_GROEN = 12;
const int PIN_GEEL = 11;
const int PIN_BLAUW = 10;
int wisselBuffer;
int standLedjes[AANTALLAMPJES] = { 1, 0, 0, 0 };
int richting = -1;





void setup() {
  // put your setup code here, to run once:
  pinMode(PIN_ROOD, OUTPUT);
  pinMode(PIN_GROEN, OUTPUT);
  pinMode(PIN_GEEL, OUTPUT);
  pinMode(PIN_BLAUW, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (richting == 1) {//RECHTSOM
    wisselBuffer = standLedjes[0];
    for (int teller = 0; teller < AANTALLAMPJES - 1; teller = teller + 1) {
      standLedjes[teller] = standLedjes[(teller + 1) % AANTALLAMPJES];
      Serial.print(wisselBuffer);
      Serial.print("RECHTSOM standLedjes[");
      Serial.print(teller);
      Serial.print("] = ");
      Serial.println(standLedjes[teller]);
    }
    standLedjes[AANTALLAMPJES - 1] = wisselBuffer;
  }
  else{//LINKSOM
    wisselBuffer = standLedjes[AANTALLAMPJES - 1];
    for (int teller = AANTALLAMPJES - 1; teller > 0; teller = teller - 1) {
      standLedjes[teller] = standLedjes[(teller - 1) % AANTALLAMPJES];
      Serial.print(wisselBuffer);
      Serial.print("LINKSOM standLedjes[");
      Serial.print(teller);
      Serial.print("] = ");
      Serial.println(standLedjes[teller]);
    }
    standLedjes[0] = wisselBuffer;
  }











  for (int teller = 0; teller < AANTALLAMPJES; teller = teller + 1) {
    if (standLedjes[teller] == 0) {
      digitalWrite(teller + 10, LOW);
    }
    if (standLedjes[teller] == 1) {
      digitalWrite(teller + 10, HIGH);
    }
    Serial.println(teller);
  }
  delay(250);






}