"Etch-a-Phone"

     In our team "Etch-a-Phone" (Etch-a-Sketch + Xylophone) project, we created a puzzle for an escape room. In the escape room, the players will find a clue telling them to play "Santa Claus is Comin' to Town." A microphone beneath the xylophone detects notes played and a string of LEDs gives the player feedback on whether they have hit the correct notes. When each segment of the song is played correctly, one digit of a five-digit code will be drawn.

     My role in the project development included designing and soldering the PCBs, programming the light string logic for gameplay, and implementing a reset function (with blinking lights as a fore-warning) so the game can be reset autonomously after a set amount of time.

Reset and LED Light String Game Logic

void StateMachine() {

  // logic for when the note is detected

  if(noteDet){

    //Serial.println(songIndex);

    lastHit = micros();

    noteDet = false;

    if(santaClauseIsComingToTown[songIndex] == noteVal){

      send = 0;

      SendData();

      songIndex++;

      sequenceIndex++;

      Lights(XY_GREEN);

      Serial.println("Green");    

      wrongCount = 0;

      CheckSequence();

    } //

    else if (wrongCount < maxWrongNotes) {

      Lights(XY_YELLOW);

      send = 1;

      SendData();

      Serial.println("Yellow");

      wrongCount++;      

    }

    else {

      send = 2;

      SendData();

      Lights(XY_RED);

      Serial.println("Red");

      if(maxWrongNotes < 5) {

        maxWrongNotes++;

      }

      songIndex -= sequenceIndex;

      sequenceIndex = 0;

      wrongCount = 0;

    }

  } // check to see if it is time to reset as long as there wasn't a hit already

  else if(lastHit != 0){

    currentTime = micros();

    // turn white to be ready for next hit

    if((currentTime - lastHit) >= (MICROS_TO_RESET + MICROS_RESET_LIGHTS)){

      //Serial.println("Ready for Hit");

      Lights(XY_WHITE);

      sentReset = 0;

    } // Check to see if the last hit was long enough ago to reset

    else if((currentTime - lastHit) >= MICROS_TO_RESET){

      // send information to reset if it hasn't already been sent

      if(!sentReset){

        send = 4;

        SendData();

        Serial.println("Reset");

        sentReset = 1;

      }

      // flash the lights red and reset variables for the beginning of the game

      Lights(XY_RED);

      songIndex = 0;

      sequenceIndex = 0;

      sequenceNum = 0;

      leds.set_leds_grow(seqLengths[sequenceNum]);

      wrongCount = 0;

    } // Send a warning on the LEDs if the reset is about to happen

    else if((currentTime - lastHit) >= (MICROS_TO_RESET - MICROS_WARNING)){

      // flash red for even warning segments

      // start back at the beginning of the sequence if they play a note during the warning

      songIndex -= sequenceIndex;

      sequenceIndex = 0;

      wrongCount = 0;

      sentReset = 0;

      if((int)((((currentTime - lastHit) - (MICROS_TO_RESET - MICROS_WARNING))/(MICROS_WARNING/FLASH_SEGMENTS))) % 2 == 0){

        Lights(XY_RED);

      } // flash white for odd warning segments

      else{

        Lights(XY_WHITE);

      }

      //Serial.println("Warning");

    }

  }

}