Kids' Wooden Radio

#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
#include <Adafruit_NeoPixel.h>

#define BUTTON_1 A2 // yellow left
#define BUTTON_2 A1 // yellow right
#define BUTTON_3 A3 // red left
#define BUTTON_4 A0 // red right
#define BUTTON_5 A4 // blue left
#define BUTTON_6 2 // blue right
#define BUTTON_7 3 // black

#define BUTTONS_COUNT 7

#define BUTTON_RELEASED 0
#define BUTTON_PRESSED 1
#define BUTTON_HANDLED 2

byte buttonPins[] = {BUTTON_1, BUTTON_2, BUTTON_3, BUTTON_4, BUTTON_5, BUTTON_6, BUTTON_7};
byte buttonState[] = {0, 0, 0, 0, 0, 0, 0};

#define NEOPIXEL_PIN 9
#define RED 0
#define GREEN 1
#define BLUE 2

float currentRGB[] = {0, 0, 0};
float changeRGB[] = {0, 0, 0};
byte newRGB[] = {0, 0, 0};

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(4, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ400);
SoftwareSerial playerSerial(7, 6); // RX, TX
DFRobotDFPlayerMini player;

#define FOLDER_RED 0
#define FOLDER_BLUE 1
#define FOLDER_YELLOW 2

byte currentSong[] = {0, 0, 0}; // 1 to size of folder
byte folderSizes[] = {0, 0, 0};
byte volume = 5;
byte lightIntensity = 0;

void setup() {
  randomSeed(analogRead(A7));
  playerSerial.begin(9600);
  Serial.begin(115200);
  pixels.begin();
  pixelsUnifiedColor(0);

  for (int i = 0; i < BUTTONS_COUNT; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
    buttonState[i] = BUTTON_RELEASED;
  }
  
  Serial.println();
  Serial.println(F("DFRobot DFPlayer Mini Demo"));
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
  
  if (!player.begin(playerSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while(true);
  }
  Serial.println(F("DFPlayer Mini online."));

  //player.EQ(DFPLAYER_EQ_ROCK);
  player.outputDevice(DFPLAYER_DEVICE_SD);
  player.volume(volume);
  //player.play(1);

  folderSizes[FOLDER_RED] = player.readFileCountsInFolder(FOLDER_RED + 1);
  folderSizes[FOLDER_BLUE] = player.readFileCountsInFolder(FOLDER_BLUE + 1);
  folderSizes[FOLDER_YELLOW] = player.readFileCountsInFolder(FOLDER_YELLOW + 1);
  Serial.println(F("Radio ready."));
}

void loop() {  
  if (player.available()) {
    printDetail(player.readType(), player.read()); //Print the detail message from DFPlayer to handle different errors and states.
  }

  readButtons();
  crossFade();
  delay(15);
}

void readButtons() {
  for (int i = 0; i < BUTTONS_COUNT; i++) {
    if (digitalRead(buttonPins[i]) == HIGH) {
      buttonState[i] = BUTTON_RELEASED;
    }
    else if (buttonState[i] == BUTTON_RELEASED) {
      buttonState[i] = BUTTON_PRESSED;
    }
  }

  if (buttonState[0] == BUTTON_PRESSED) { // yellow left
    buttonState[0] = BUTTON_HANDLED;
    playNextInFolder(FOLDER_YELLOW);
  }
  else if (buttonState[1] == BUTTON_PRESSED) { // yellow right
    buttonState[1] = BUTTON_HANDLED;
    playPreviousInFolder(FOLDER_YELLOW);
  }
  else if (buttonState[2] == BUTTON_PRESSED) { // red left
    buttonState[2] = BUTTON_HANDLED;
    playNextInFolder(FOLDER_RED);
  }
  else if (buttonState[3] == BUTTON_PRESSED) { // red right
    buttonState[3] = BUTTON_HANDLED;
    playPreviousInFolder(FOLDER_RED);
  }
  else if (buttonState[4] == BUTTON_PRESSED) { // blue left
    buttonState[4] = BUTTON_HANDLED;
    playNextInFolder(FOLDER_BLUE);
  }
  else if (buttonState[5] == BUTTON_PRESSED) { // blue right
    buttonState[5] = BUTTON_HANDLED;
    playPreviousInFolder(FOLDER_BLUE);
  }
  else if (buttonState[6] == BUTTON_PRESSED) { // black
    volume = volume >= 15 ? 5 : volume + 5;
    player.volume(volume);
    buttonState[6] = BUTTON_HANDLED;
  }
}

void playNextInFolder(byte folder) {
  currentSong[folder]++;
  if (currentSong[folder] > folderSizes[folder]) {
    currentSong[folder] = 1;
  }
  player.playFolder(folder + 1, currentSong[folder]);
}

void playPreviousInFolder(byte folder) {
  currentSong[folder]--;
  if (currentSong[folder] <= 0) {
    currentSong[folder] = folderSizes[folder];
  }
  player.playFolder(folder + 1, currentSong[folder]);
}

void printDetail(uint8_t type, int value){
  switch (type) {
    case TimeOut:
      Serial.println(F("Time Out!"));
      break;
    case WrongStack:
      Serial.println(F("Stack Wrong!"));
      break;
    case DFPlayerCardInserted:
      Serial.println(F("Card Inserted!"));
      break;
    case DFPlayerCardRemoved:
      Serial.println(F("Card Removed!"));
      break;
    case DFPlayerCardOnline:
      Serial.println(F("Card Online!"));
      break;
    case DFPlayerPlayFinished:
      Serial.print(F("Number:"));
      Serial.print(value);
      Serial.println(F(" Play Finished!"));
      break;
    case DFPlayerError:
      Serial.print(F("DFPlayerError:"));
      switch (value) {
        case Busy:
          Serial.println(F("Card not found"));
          break;
        case Sleeping:
          Serial.println(F("Sleeping"));
          break;
        case SerialWrongStack:
          Serial.println(F("Get Wrong Stack"));
          break;
        case CheckSumNotMatch:
          Serial.println(F("Check Sum Not Match"));
          break;
        case FileIndexOut:
          Serial.println(F("File Index Out of Bound"));
          break;
        case FileMismatch:
          Serial.println(F("Cannot Find File"));
          break;
        case Advertise:
          Serial.println(F("In Advertise"));
          break;
        default:
          break;
      }
      break;
    default:
      break;
  }
}

void prepareCrossFade(byte red, byte green, byte blue, unsigned int duration) {
  float rchange = red - currentRGB[RED];
  float gchange = green - currentRGB[GREEN];
  float bchange = blue - currentRGB[BLUE];

  changeRGB[RED] = rchange / (float) duration;
  changeRGB[GREEN] = gchange / (float) duration;
  changeRGB[BLUE] = bchange / (float) duration;

  newRGB[RED] = red;
  newRGB[GREEN] = green;
  newRGB[BLUE] = blue;

  Serial.print(newRGB[RED]);
  Serial.print(" ");
  Serial.print(newRGB[GREEN]);
  Serial.print(" ");
  Serial.print(newRGB[BLUE]);
  Serial.print(" (");
  Serial.print(changeRGB[RED]);
  Serial.print(" ");
  Serial.print(changeRGB[GREEN]);
  Serial.print(" ");
  Serial.print(changeRGB[BLUE]);
  Serial.println(")");
}

boolean crossFade() {
  if (currentRGB[RED] == newRGB[RED] && currentRGB[GREEN] == newRGB[GREEN] && currentRGB[BLUE] == newRGB[BLUE]) {
    return true;
  }
  for (byte i = 0; i < 3; i++) {
    if (changeRGB[i] > 0 && currentRGB[i] < newRGB[i]) {
      currentRGB[i] = currentRGB[i] + changeRGB[i];
    }
    else if (changeRGB[i] < 0 && currentRGB[i] > newRGB[i]) {
      currentRGB[i] = currentRGB[i] + changeRGB[i];
    }
    else {
      currentRGB[i] = newRGB[i];
    }
  }
  pixelsUnifiedColor(pixels.Color(currentRGB[RED], currentRGB[GREEN], currentRGB[BLUE]));
  return false;
}

void pixelsUnifiedColor(uint32_t color) {
  for (unsigned int i = 0; i < pixels.numPixels(); i++) {
    pixels.setPixelColor(i, color);
  }
  pixels.show();
}

void rainbow(int j) {
  uint16_t i;
  byte num = pixels.numPixels() - 1;
  pixels.setPixelColor(pixels.numPixels() - 1, 100, 100, 100);

  for (i = 0; i < num; i++) {
    pixels.setPixelColor(i, colorWheel(((i * 256 / num) + j) & 255));
  }
  pixels.show();
}

uint32_t colorWheel(byte wheelPos) {
  // Input a value 0 to 255 to get a color value.
  // The colours are a transition r - g - b - back to r.
  wheelPos = 255 - wheelPos;
  if (wheelPos < 85) {
    return pixels.Color(255 - wheelPos * 3, 0, wheelPos * 3);
  }
  if (wheelPos < 170) {
    wheelPos -= 85;
    return pixels.Color(0, wheelPos * 3, 255 - wheelPos * 3);
  }
  wheelPos -= 170;
  return pixels.Color(wheelPos * 3, 255 - wheelPos * 3, 0);
}