//for leds
byte led[5]={8,9,10,11,12};
void initLedPins(){
  for(int i=0;i<5;i++){
   pinMode(led[i],OUTPUT);
   }
}



//random
#define MIN_UNIQUES 3  //must be at least one lower then sum of numbers betwhen NUMSTART and NUMEND
#define NUMSTART 1 //random start number, include the given number
#define NUMEND 5 //random end number, include the given number
int rndVal;
int counter = 0;
int r_last[MIN_UNIQUES];
int retrys = 0;




void setup() {
  Serial.begin(115200);
  initLedPins();


  //to create near real random numbers use randomSeed.
  //reboot more times to see it in serialmonitor
  Serial.print("without seed every boot comes the same number: ");
  Serial.println(random(0, 4096));

  randomSeed(analogRead(0)); //one call per session is ok. use unconnected analogpin

  Serial.print("with seed ever an another number: ");
  Serial.println(random(0, 4096));
 
 
  delay(3000);
}




void loop() {
  
  int randNum = myRandom(NUMSTART,NUMEND); //get Random number...
  
  digitalWrite(led[randNum-1],HIGH); //...set led...


  Serial.print("Number "); //...print infos
  if (randNum < 10) Serial.print(" ");
  Serial.print(randNum);
  Serial.print(" - ");
  if (retrys < 10) Serial.print(" ");
  Serial.print(retrys);
  Serial.print(" Retrys ");
  for (int i = 0; i < retrys; i++) {
    Serial.print("#");
  }
  Serial.println();

  delay(200); //hmmmm.THAT seems how the worst command that we know! i want nothing to say to that!
  digitalWrite(led[randNum-1],LOW); //led off
}




int myRandom(int nums, int nume) {
  int r = random(nums, nume); //give first try
  retrys = 0;
  for (int i = 0; i < MIN_UNIQUES; i++) { //compare number with all numbers in array to check if try unique
    if (r == r_last[i]) {
      r = random(nums, nume+1); //if not, retry...
      i = -1; //...from start...
      retrys++; //...and count trys... only to show in serialmonitor.
    }
  }
  counter++; //count for last-numbers array
  if (counter == MIN_UNIQUES) {  //if array end reached, back to array start
    counter = 0;
     }
  r_last[counter] = r; //save last unique number


  return r; //send number
}