int REDpin = 11;
int GREENpin = 10;
int BLUEpin = 9;
void setup() {
  // put your setup code here, to run once:
  pinMode(REDpin , OUTPUT);
  pinMode(GREENpin , OUTPUT);
  pinMode(BLUEpin , OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
    Color(0 , 255 , 255);
    delay(500);
    Color(255 , 0 , 255);
    delay(500);
    Color(255 , 255 , 0);
    delay(500);
}

void Color(int REDv , int GREENv , int BLUEv) {
  analogWrite(REDpin , REDv);
  analogWrite(GREENpin , GREENv);
  analogWrite(BLUEpin , BLUEv);
}