Recording WAV files with VS1053 and Arduino Nano - working example

Other Hardware Audio
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Hi,
I just thought I'd document this here:

I was able to get reliable WAV file recording working, using an arduino nano, and a VS1053 circuit board (that also contained an SD card writer).

I wasn't able to find an off-the-shelf solution to this problem, so spent a couple of days working through some options before putting this pull request together:

It might not work for everybody (I'm not sure if it will work with those ESP32 boards) but it should be a real headstart for anyone trying to save .wav files directly from a VS1053 circuit.

The reason I wanted to do this, was that the default Adafruit code used Ogg Vorbis recording, which is a bit unusual, and had a bit of a delay before recording started.
The VS1053 chip is supposed to be able to generate the signal for a WAV file natively, so it should be possible to get it to save .WAV files instead of .ogg files.

I'm very happy to have solved this problem, I really hope this helps someone else.

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If anyone wants to try saving WAV files without replacing the default Adafruit VS1053 library, I've posted the following sketch which works with the default libraries:

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