struct rgbLED {
  int R, G, B;

  void init(int r, int g, int b) {
    R = r; G = g; B = b;
    pinMode(R, OUTPUT);
    pinMode(G, OUTPUT);
    pinMode(B, OUTPUT);
  }
  void setColor(bool r, bool g, bool b) {
    digitalWrite(R, r);
    digitalWrite(G, g);
    digitalWrite(B, b);
  }
  void setCustomColor(int r, int g, int b) {
    analogWrite(R, r);
    analogWrite(G, g);
    analogWrite(B, b);
  }
};

rgbLED LEDs[4];

void setup() {
  LEDs[0].init(4, 3, 2);
  LEDs[1].init(7, 6, 5);
  LEDs[2].init(10, 9, 8);
  LEDs[3].init(13, 12, 11);
}
void loop() {
  /*
    LEDs[0].setColor(1, 0, 0);
    LEDs[1].setColor(0, 1, 0);
    LEDs[2].setColor(0, 0, 1);
    LEDs[3].setColor(1, 1, 1);
  */
  /*
    for(int i = 0; i < 4; i++){
    int r = rand() % 2;
    int g = rand() % 2;
    int b = rand() % 2;
    LEDs[i].setColor(r, g, b);
    delay(50);
    }
  */
  int r = rand() % 2;
  int g = rand() % 2;
  int b = rand() % 2;
  for (int i = 0; i < 4; i++) {
    LEDs[i].setColor(r, g, b);
    delay(150);
  }
  for (int i = 3; i >= 0; i--) {
    LEDs[i].setColor(0, 0, 0);
    delay(150);
  }
}