int randomNumber;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  randomSeed(analogRead(0));
  pinMode(3, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  randomNumber =  random(0, 256);
}

void loop() {
  // put your main code here, to run repeatedly:

  analogWrite(3, random(0, 256));
  analogWrite(11, random(0, 256));
  analogWrite(10, random(0, 256));
  delay(1000);
}