int red = 11;
int yellow = 12;
int green = 13;

void setup() {
  // put your setup code here, to run once:
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int nr_of_LEDs = 3;
  int nr_of_orders = 5;
  int matrix[nr_of_orders][nr_of_LEDs] = {{1,0,0}, {0,1,0}, {0,0,1}, {0,0,0}, {1,1,1}};
  int pin = 0;
  for (int i = 0 ; i < nr_of_orders ; i++){
    for (int j = 0 ; j < nr_of_LEDs ; j++){
      switch(j){
        case 0:
          pin = red;
          break;
        case 1:
          pin = yellow;
          break;
        case 2:
          pin = green;
          break;
      }
      if (matrix[i][j] == 1){
        digitalWrite(pin, HIGH);
      }
      else{
        digitalWrite(pin, LOW);
      }
    }
    delay(500);
  }
}