int PinR = 6;
int PinG = 5;
int PinB = 3;

void setup() {

pinMode(PinR, OUTPUT);
pinMode(PinG, OUTPUT);
pinMode(PinB, OUTPUT);

}

void loop() {
  int i = (rand() % 255 - 1)+1;
  int j = (rand() % 255 - 1)+1;
  int k = (rand() % 255 - 1)+1;
   
  color (i,j,k);
  delay(500);
  Serial.println(String(i) + " " + String(j) + " " + String(k));
}

void color(int R, int G, int B) {

  R = 255 - R;
  G = 255 - G;
  B = 255 - B;

  analogWrite(PinR, R);
  analogWrite(PinG, G);
  analogWrite(PinB, B);

}