int rosso = 11;
int verde = 10;
int blu = 9;
int coloreled = 0;
int t = 1000;

void setup() {
  pinMode(rosso, OUTPUT);
  pinMode(blu, OUTPUT);
  pinMode(verde, OUTPUT);

}

void loop(){

  analogWrite(blu, random(255));
  analogWrite(rosso, random(255));
  analogWrite(verde, random(255));
  delay(t);
  }