BeatCube! The magical 4x4x4 LED Cube that detects music! ---> https://youtu.be/gIms3RQuJqA

cub.ino

/* https://youtu.be/gIms3RQuJqA */

/* Cuby! The magical 4x4x4 LED Cube that detects music!
 *  This project was done with an arduino 1, which contains 14 digital pins, and 6 analog ones
 *  Cuby is a 4x4x4 LED Cube. That means that there are 4 planes of 16 LEDs each
 *  One of those planes, however, won't be controllable, it will be directly connected to the ground exit of the arduino
 *  So each time a LED is turned on, wherever it is placed, the corresponding LED of that plane will also switch on
 *  This is because of a lack of pins. One analog pin must be used by the sound detector, leaving only 3 controllable planes
 *  The division of pins will be done like this:
 *  - D0 to D13 are the first 14 positive side of the leds
 *  - A0 and A1 are the other 2 positive leds
 *  - A2, A3 and A4 will be the grounds. One for each controllable plane
 *  - A5 will be used by the sound detector
 */

int LED[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
int LEDCount = 16;
int PlanePin[] = {A2, A3, A4, A5};
int PlanePinCount  = 4;
int SoundSensorPin = A7; 

int SoundThreshold = -1; // The first value read by the microphone will be the ambient sound (have a quiet room right before connecting the arduino!)
int SoundDivision = 10;

void setup() {
  Serial.begin(9600);
  for (int pin=0; pin<LEDCount; pin++) {
    pinMode( LED[pin], OUTPUT );
  }
  for (int pin=0; pin<PlanePinCount; pin++) {
    pinMode( PlanePin[pin], OUTPUT );
    digitalWrite( PlanePin[pin], HIGH);
  }
  pinMode(SoundSensorPin, INPUT);
  SoundThreshold = analogRead(SoundSensorPin)+1;
}

void turnOnPlane(int plane) {
  if (digitalRead(PlanePin[plane]) == HIGH) {
    digitalWrite(PlanePin[plane], LOW);    
  }
}

void turnOffPlane(int plane) {
  if (digitalRead(PlanePin[plane]) == LOW) {
    digitalWrite(PlanePin[plane], HIGH);    
  }
}

void turnOff(int led){
  digitalWrite(led, LOW);
}

void turnOn(int led){
  digitalWrite(led, HIGH);
}

void fadeOut(int level){
  for (int plane=PlanePinCount-1; plane > level; plane--) {
    turnOffPlane(plane);
  }
}

void fadeIn(int level) {
  for (int pin=0; pin<LEDCount; pin++) {
    turnOn(LED[pin]);
  }
  for (int plane=0; plane<=level; plane++) {
    turnOnPlane(plane);
  }
}

void turnOffAll() {
  for (int pin=0; pin<LEDCount; pin++) {
    turnOff(LED[pin]);
  }
}


void turnOnLevel(int level) {
  fadeOut(level);
  if (level == -1) {
    turnOffAll();
  }
  else fadeIn(level);
}

void loop() {
  int sensorData = analogRead(SoundSensorPin); 
  int deltaSound = sensorData - SoundThreshold;
  int level = map(deltaSound, -SoundDivision, 4*SoundDivision, -1, PlanePinCount-1);
  Serial.println((String) sensorData + " - " + SoundThreshold + ": " + level);
  turnOnLevel(level);
}