int ledPinR = 11;
int ledPinG = 10;
int ledPinB = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledPinR, OUTPUT);
  pinMode(ledPinG, OUTPUT);
  pinMode(ledPinB, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  rgbLedDisplay(random(256), random(256), random(256));
  delay(10);
}
void rgbLedDisplay(int R, int G, int B){
  analogWrite(ledPinR, constrain(R, 0, 255));
  delay(10);
  analogWrite(ledPinG, constrain(G, 0, 255));
  delay(10);
  analogWrite(ledPinB, constrain(B, 0, 255));
}