Slides

Source Code

/*
 * Arduino Clone of the classic Simon Game
 *
 * Made at Hack Aarhus / OSAA
 * http://www.hackaarhus.dk
 * http://www.osaa.dk
 *
 * Released into the public domain by
 * Rene Hangstrup Moeller, July 2010
 *
 * http://www.giddyplanet.com
 */

//---------------------------------------------------------
//	GLOBALS weeeee!
//=========================================================

// the number of leds/switches
int SIZE = 4;

// milliseconds delay between each element in the sequence
int PLAY_DELAY = 250;
int INPUT_DELAY = 200;

// the sequence
int sequence[128];

// current sequence length
int seqlen = 0;

// Sound frequencies for each led-switch pair
int notes[] = {
    261/2, 392/2, 587/2, 880/2
};

//---------------------------------------------------------
//	PIN MAPPINGS
//=========================================================

// the buzzer control pin
int buzzPin = 11;

// calculate pin for led
int ledPin(int num) {
  return (num + 1) * 2;
}

// calculate pin for button
int buttonPin(int num) {
  return ledPin(num) + 1;
}

//---------------------------------------------------------
//	HELPER FUNCTIONS
//=========================================================

// mute the buzzer and turn off all leds
void turnOff() {
    noTone(buzzPin);
    for (int n = 0; n < SIZE; n++) {
      digitalWrite(ledPin(n), LOW);
    }
}

// new game
void newGame() {
  // generate random sequence with two entries
  sequence[0] = random(SIZE);
  sequence[1] = random(SIZE);
  seqlen = 2;

  // blink leds 10 times to indicate game start
  for (int i = 0; i < 10; i++) {
    for (int n = 0; n < SIZE; n++) {
      digitalWrite(ledPin(n), HIGH);
    }
    delay(200);

    turnOff();
    delay(200);
  }
}

// add an entry to the sequence
void expand() {
  sequence[seqlen++] = random(SIZE);
}

// play the sequence
void playSequence() {
  Serial.println("Playing sequence");

  for (int i = 0; i < seqlen; i++) {
    int v = sequence[i];
    tone(buzzPin, notes[v]);

    for (int n = 0; n < SIZE; n++) {
      digitalWrite(ledPin(n), n == v ? HIGH : LOW);
    }

    delay(PLAY_DELAY);
    noTone(buzzPin);

    for (int n = 0; n < SIZE; n++) {
      digitalWrite(ledPin(n), LOW);
    }

    delay(PLAY_DELAY);
  }
  turnOff();
}

// wait for button press
int nextButton() {

  while (true) {

    for (int n = 0; n < SIZE; n++) {
      if (digitalRead(buttonPin(n)) == HIGH) {
        digitalWrite(ledPin(n), HIGH);

        while (digitalRead(buttonPin(n)) == HIGH) {
          delay(INPUT_DELAY);
        }

        turnOff();
        return n;
      }
    }
    delay(INPUT_DELAY);
  }

  return 0; // never
}

// read sequence from player
int readSequence() {
  for (int i = 0; i < seqlen; i++) {
    int nb = nextButton();

    if (nb != sequence[i]) {
      Serial.println("Error");
      return false;
    }
  }

  Serial.println("Accepted");
  return true;
}

//---------------------------------------------------------
//	ARDUINO ENTRY POINTS
//=========================================================

// initialize the Arduino
void setup() {
  // initialize random number sequence
  randomSeed(micros() + analogRead(0));

  // configure pins for LEDs and buttons
  for (int i = 0; i < SIZE; i++) {
    pinMode(ledPin(i), OUTPUT);
    pinMode(buttonPin(i), INPUT);
  }

  // configure pin for sound
  pinMode(buzzPin, OUTPUT);

  // initialize serial communication for debugging
  Serial.begin(9600);
  Serial.println("Setup completed. Welcome to Simon");
}

// The game loop - each run corresponds to a game
void loop() {
  Serial.println("Starting new game");
  newGame();

  int running = true;

  while (running) {
    delay(1000);
    playSequence();
    running = readSequence();
    if (running) {
      expand();
    }
  }   

  delay(250);
}