Looping Louie Advanced

looping.ino

#define POT_PIN 1
#define DC_MOTOR_PIN 3
#define BUTTON_PIN 2
#define LED_PIN 13

int speed = 0;
int minSpeed = 60;
int maxSpeed = 255;
int val = 0;
int prevButtonState = 0;
int buttonState = 0;
int skip = 0;
bool started = false;
bool crazy = false;

void setup() {
  // put your setup code here, to run once
  pinMode(DC_MOTOR_PIN, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  val = analogRead(POT_PIN);
  if(started) {
    speed = minSpeed + (maxSpeed - minSpeed) * (val / 1023.0);
  }
  if(crazy && random(10) > 5) {
    speed = speed * (random(100) / 100.0);
    if(random(10) > 8) {
      skip = 3;
    }
  }
    /* Run motor */
  if(skip > 0) {
    analogWrite( DC_MOTOR_PIN, 0 );  
    skip -= 1;
  } else {
      analogWrite( DC_MOTOR_PIN, speed );  
  }
  
  buttonState = digitalRead(BUTTON_PIN);
  if (buttonState == HIGH && prevButtonState == LOW) {
    if(!started) {
      started = true;
    } else {
      crazy = !crazy;
    }
  } 
  prevButtonState = buttonState;
  
  if(crazy) {
    digitalWrite(LED_BUILTIN, HIGH);
  } else {
    digitalWrite(LED_BUILTIN, LOW);
  }
  delay(100);
}