// Roulette, European Wheel
// c(2017) Th.M. Hupkens. Tested with an Arduino nano

#define PushButton 12

#define Click A5
#define ZeroLed 11
int quarter = A1; // Keeps track of in which quarter the current led is
int led; // Keeps track of which led is ON
bool CCW = true; // Counter clockwise
void setup() {
  for (int i = 2; i <= 11; i++) pinMode(i, OUTPUT);
  pinMode(PushButton, INPUT_PULLUP);
  for (int a = A1; a <= A5; a++) pinMode(a, OUTPUT); // LOW = ON
  for (int nowmber = 1; nowmber < 4; nowmber++)
    for (int i = 2; i <= 10; i++) { // Animation when wheel starts up
      digitalWrite(i, HIGH);
      delay(200 - nowmber * 40 - (i - 2) * 5);
      digitalWrite(i, LOW);
    }
  randomSeed(analogRead(A0)); // Initialise the random nowmber generator
  led = random(2, 11); quarter = random(A1, A5); // choose led from 1 to 10; choose quarter from A1 to A4
  for (int a = A1; a <= A4; a++) digitalWrite(a, a != quarter); digitalWrite(led, HIGH); 
}

void loop() {
  while (digitalRead(PushButton)); 
  unsigned long now = millis();
  while (!digitalRead(PushButton));
  unsigned long tijd = millis() - now;
  int Steps = 37 + random(18); // For the time being
  if (tijd > 500) Steps *= 2;  // Pressing the push button more than half a second gives a longer roll
  if (tijd > 5000) Steps *= 2.01;
  int Stap = 1;
  while (Stap < Steps) {
    Stap++;
    digitalWrite(led, LOW);
    if (CCW) {
      led++;
      if (led > 10) {
        if (quarter == A4) {
          if (led > 11) {
            quarter = A1;
            led = 2;
          }
        }
        else {
          led = 2;
          quarter++;
        }
      }
    }
    else { // if NOT counter clockwise
      led--;
      if (led < 2) {
        if (quarter == A1) {
          led = ZeroLed;
          quarter = A4;
        }
        else {
          led = 10; 
          quarter--;
        }
      }
    }
    for (int a = A1; a <= A4; a++) digitalWrite(a, a != quarter); // if a is not the current quarter then a -> HIGH else a -> LOW
    digitalWrite(led, HIGH);
    digitalWrite(Click, HIGH); delayMicroseconds(40); digitalWrite(Click, LOW);
    unsigned int delaytijd = 40 + Stap * 5;
    if (tijd > 500) delaytijd /= 2;
    delay(delaytijd);
  }
  CCW = !CCW;
}