#define ROW1 11  //red
#define ROW2 12  //green
#define ROW3 13  //blue

void setup() {
  // put your setup code here, to run once:
  pinMode(ROW1, OUTPUT);
  pinMode(ROW2, OUTPUT);
  pinMode(ROW3, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
}

unsigned char c{};

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(c + 2, true);
  delay(1000);
  digitalWrite(c + 2, false);
  c = (c + 1) % 3;
}