This sample code is for pelita 3d printing project using arduino.

Pelita.ino

const int LED = 10; 
long random_led;
long random_time;
int difer_time();

void setup() {
  pinMode(LED, OUTPUT);  
}

int min_led = 200;
int max_led = 1024;

void loop() {
  
  random_led = random(min_led, max_led);  // random number to shine led
  random_time = difer_time(random_led);   // convert strength to time
  analogWrite(LED, random_led);           // set LED to value PWM
  delay(random_time);                     // set delay depending of the strength

}

int difer_time(int s){
  
  int a, b, wait;
  
  b = map(s, min_led, max_led, 1, 100); // remap strength to 100%
  
  // 3 stages of random speed. If more light then longer delay
  if (b > 80){
    wait = random(80, 100); // max strength
  }
  else if (b > 20 && b < 60){
    wait = random(20, 80); // midle strength. 
  }
  else{
    wait = random(1, 20); // led almost turned of, time very short.
  }
  
  return wait;
}