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writing to SD card of featherwing from feather
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Please be positive and constructive with your questions and comments.

writing to SD card of featherwing from feather

by FReynolds on Wed Oct 27, 2021 9:20 pm

I would like to record sound and save it to an SD from which I can replay the sound file sometime in the future. Several products have SD card slots, but the sound files have to be stored on the SD via a PC before they can be played on the feather. I want to be able to record a sound stream from a mic or from a bluetooth connection and save it on an SD card and replay the sound sometime in the future using only the feather and wings or other gadgets attached to the feather.

I have looked at the Music Wings but I cannot find a way to write a sound file / stream to the SD card of a Music Wing. The AdaLogger product can write bits to an SD card but I cannot see a way to get the bits from the AdaLogger to a Music Wing (or any other .mp3 player for that matter) without removing the SD card from the AdaLogger and putting it in the SD card slot of the Music Wing.

Any music/sound player products out there that provide a solution?

Posts: 9
Joined: Wed Apr 14, 2021 12:45 am

Re: writing to SD card of featherwing from feather

by mikeysklar on Fri Oct 29, 2021 4:17 pm


The Adafruit Music Maker FEatherWing can record MP3/OGG/WAV direct to SD.


OGG recording example:

https://github.com/adafruit/Adafruit_VS ... rd_ogg.ino

Code: Select all | TOGGLE FULL SIZE
  This is an example for the Adafruit VS1053 Codec Breakout

  Designed specifically to work with the Adafruit VS1053 Codec Breakout
  ----> https://www.adafruit.com/products/1381

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries. 
  BSD license, all text above must be included in any redistribution

// This is a very beta demo of Ogg Vorbis recording. It works...
// Connect a button to digital 7 on the Arduino and use that to
// start and stop recording.

// A mic or line-in connection is required. See page 13 of the
// datasheet for wiring

// Don't forget to copy the v44k1q05.img patch to your micro SD
// card before running this example!

// include SPI, MP3 and SD libraries
#include <SPI.h>
#include <Adafruit_VS1053.h>
#include <SD.h>

// define the pins used
#define RESET 9      // VS1053 reset pin (output)
#define CS 10        // VS1053 chip select pin (output)
#define DCS 8        // VS1053 Data/command select pin (output)
#define CARDCS A0     // Card chip select pin
#define DREQ 3       // VS1053 Data request, ideally an Interrupt pin

#define REC_BUTTON 7

Adafruit_VS1053_FilePlayer musicPlayer = Adafruit_VS1053_FilePlayer(RESET, CS, DCS, DREQ, CARDCS);

File recording;  // the file we will save our recording to
#define RECBUFFSIZE 128  // 64 or 128 bytes.
uint8_t recording_buffer[RECBUFFSIZE];

void setup() {
  Serial.println("Adafruit VS1053 Ogg Recording Test");

  // initialise the music player
  if (!musicPlayer.begin()) {
    Serial.println("VS1053 not found");
    while (1);  // don't do anything more

  musicPlayer.sineTest(0x44, 500);    // Make a tone to indicate VS1053 is working
  if (!SD.begin(CARDCS)) {
    Serial.println("SD failed, or not present");
    while (1);  // don't do anything more
  Serial.println("SD OK!");
  // Set volume for left, right channels. lower numbers == louder volume!
  // when the button is pressed, record!
  digitalWrite(REC_BUTTON, HIGH);
  // load plugin from SD card! We'll use mono 44.1KHz, high quality
  if (! musicPlayer.prepareRecordOgg("v44k1q05.img")) {
     Serial.println("Couldn't load plugin!");
     while (1);   

uint8_t isRecording = false;

void loop() { 
  if (!isRecording && !digitalRead(REC_BUTTON)) {
    Serial.println("Begin recording");
    isRecording = true;
    // Check if the file exists already
    char filename[15];
    strcpy(filename, "RECORD00.OGG");
    for (uint8_t i = 0; i < 100; i++) {
      filename[6] = '0' + i/10;
      filename[7] = '0' + i%10;
      // create if does not exist, do not open existing, write, sync after write
      if (! SD.exists(filename)) {
    Serial.print("Recording to "); Serial.println(filename);
    recording = SD.open(filename, FILE_WRITE);
    if (! recording) {
       Serial.println("Couldn't open file to record!");
       while (1);
    musicPlayer.startRecordOgg(true); // use microphone (for linein, pass in 'false')
  if (isRecording)
  if (isRecording && digitalRead(REC_BUTTON)) {
    Serial.println("End recording");
    isRecording = false;
    // flush all the data!
    // close it up

uint16_t saveRecordedData(boolean isrecord) {
  uint16_t written = 0;
    // read how many words are waiting for us
  uint16_t wordswaiting = musicPlayer.recordedWordsWaiting();
  // try to process 256 words (512 bytes) at a time, for best speed
  while (wordswaiting > 256) {
    //Serial.print("Waiting: "); Serial.println(wordswaiting);
    // for example 128 bytes x 4 loops = 512 bytes
    for (int x=0; x < 512/RECBUFFSIZE; x++) {
      // fill the buffer!
      for (uint16_t addr=0; addr < RECBUFFSIZE; addr+=2) {
        uint16_t t = musicPlayer.recordedReadWord();
        //Serial.println(t, HEX);
        recording_buffer[addr] = t >> 8;
        recording_buffer[addr+1] = t;
      if (! recording.write(recording_buffer, RECBUFFSIZE)) {
            Serial.print("Couldn't write "); Serial.println(RECBUFFSIZE);
            while (1);
    // flush 512 bytes at a time
    written += 256;
    wordswaiting -= 256;
  wordswaiting = musicPlayer.recordedWordsWaiting();
  if (!isrecord) {
    Serial.print(wordswaiting); Serial.println(" remaining");
    // wrapping up the recording!
    uint16_t addr = 0;
    for (int x=0; x < wordswaiting-1; x++) {
      // fill the buffer!
      uint16_t t = musicPlayer.recordedReadWord();
      recording_buffer[addr] = t >> 8;
      recording_buffer[addr+1] = t;
      if (addr > RECBUFFSIZE) {
          if (! recording.write(recording_buffer, RECBUFFSIZE)) {
                Serial.println("Couldn't write!");
                while (1);
          addr = 0;
    if (addr != 0) {
      if (!recording.write(recording_buffer, addr)) {
        Serial.println("Couldn't write!"); while (1);
      written += addr;
    if (! (musicPlayer.sciRead(VS1053_SCI_AICTRL3) & (1 << 2))) {
       recording.write(musicPlayer.recordedReadWord() & 0xFF);

  return written;

Posts: 6227
Joined: Mon Aug 01, 2016 8:10 pm

Re: writing to SD card of featherwing from feather

by FReynolds on Sat Oct 30, 2021 1:11 am


Posts: 9
Joined: Wed Apr 14, 2021 12:45 am

Please be positive and constructive with your questions and comments.