LED roulette

Projects Programming
1

Hi guys!

I'm just beginning to understand programing arduino and I'm making a simple roulette with four leds and I want to make them stop randomly. At the moment it just stops at the same place every time. Can you please guide me?
Here is my code:

const int buttonPin = 2;

int lightpins[4] = {
  10,11,12,13};

int state=0;

void setup()
{
  pinMode (buttonPin,INPUT);
  pinMode (lightpins[0],OUTPUT);
  pinMode (lightpins[1],OUTPUT);
  pinMode (lightpins[2],OUTPUT);
  pinMode (lightpins[3],OUTPUT);

  digitalWrite (lightpins[0],LOW);
  digitalWrite (lightpins[1],LOW);
  digitalWrite (lightpins[2],LOW);
  digitalWrite (lightpins[3],LOW);
}

void loop ()
{
  int reading = digitalRead (buttonPin);
  int blinktime=20;
  boolean done;
  if (reading == HIGH)
  {
    if (state==0)
    {
      state=1;
      done=false;
      blinktime=20;
      blinktime += random(3);
      while (!done)
      {
        for (int j=0;j<4;j++)
        {
          blinktime += 4;

          digitalWrite(lightpins[j],HIGH);
          if (blinktime>200)
          {
            done=true;

            break;
          }
          delay(blinktime);
          digitalWrite(lightpins[j],LOW);
          delay(blinktime);
        }
      }

    }
  }
  else
  {
    state=0;
  }
}
2

So where and how do you plan to seed your RNG (random number generator)? If it always starts the same (default) then it will always run the same.

3

A common way of seeding the PRNG is to put this in startup()

randomSeed(analogRead(0));

That way the sequence starts at a place determined by the floating analog input, so at most 1024 different starting points, but may be good enough for your application.

4

I was hoping i could use random in the end somehow Like i said, im new to programming so i'm struggling a bit.
Thank you for the reply, i'll try with that!