int pins[] = {-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};

int rijen[] = {pins[9], pins[14], pins[8], pins[12], pins[1], pins[7], pins[2], pins[5] };
int kolommen[] = {pins[13], pins[3], pins[4], pins[10], pins[6], pins[11], pins[15], pins[16] };

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(rijen[i], OUTPUT);
    pinMode(kolommen[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < 8; i++) {
    digitalWrite(rijen[i], HIGH);
    digitalWrite(kolommen[i], LOW);
    delay(50);
    digitalWrite(rijen[i], LOW);
    digitalWrite(kolommen[i], HIGH);
  }
}