uint8_t pins[] = {2,3,4,5,6,7,8,9,10,11,12,13};
uint8_t pins_left = sizeof(pins);
uint16_t cicle=0;

void setup() {
  Serial.begin(115200);
  for(auto p: pins) pinMode(p, OUTPUT);
  for(auto p: pins) digitalWrite(p, HIGH);
  randomSeed(analogRead(A0));
  delay(1000);

}

void loop() {
  while(pins_left) {
    uint8_t r = random(pins_left--);
    for(auto p: pins) {
           Serial.println(cicle);
      if(!digitalRead(p) || r-- == 0){ 
       digitalWrite(p,LOW);
        cicle++;
       }
    }
    delay(1000);
  }
}