int R = 9;
int G = 10;
int B = 11;
int renk;
int gecikme = 1000;

void setup() {
  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  Serial.begin(9600); 
}

void loop() {
  renk = random(6); 
  Serial.println(renk); 

  switch (renk) {
    case 0:
      analogWrite(R, 0);
      analogWrite(G, 255);
      analogWrite(B, 255);
      delay(gecikme);
      break;

    case 1:
      analogWrite(R, 255);
      analogWrite(G, 0);
      analogWrite(B, 255);
      delay(gecikme);
      break;

    case 2:
      analogWrite(R, 255);
      analogWrite(G, 255);
      analogWrite(B, 0);
      delay(gecikme);
      break;
      
      case 3:
      analogWrite(R, 255);
      analogWrite(G, 0);
      analogWrite(B, 0);
      delay(gecikme);
      break;
      
      case 4:
      analogWrite(R, 0);
      analogWrite(G, 255);
      analogWrite(B, 0);
      delay(gecikme);
      break;
      
      case 5:
      analogWrite(R, 0);
      analogWrite(G, 0);
      analogWrite(B, 255);
      delay(gecikme);
      break;
      
  }
}