WART: (really) cheap audio playback

WART may be the the worst sounding audio playback systems ever created. But it's six lines of code and works on the tiniest processors.

R. D. Poor

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Description

WART uses the garden-variety UART available in any microcontroller to generate PWM audio. This project shows you how the PWM works, and includes schematics, photos, an Arduino project file and a python script to convert your favorite .WAV file to a "WART format" .h file. As a special bonus, you get a pre-made wart.h file for your listening enjoyment!

Details

Full build details and other goodies are in https://github.com/rdpoor/WART

Beyond the basics shown in this project, some future directions to consider:

Run at a higher bit rate
Use an H bridge to drive the speaker
The current system uses one full byte to represent nine different PWM levels. This is inefficient -- create a more compact representation.
Make it easier to convert audio files into WART-format .h files.

Files

LICENSE You are free to copy and modify the code under the terms of the MIT License. license - 1.07 kB - 07/12/2021 at 12:05		Download
Rolling.wav A sample recording of the WART output. x-wav - 1.49 MB - 06/28/2021 at 13:13		Download
wart.py Convert a .wav file to a WART-format .h file x-python-script - 3.25 kB - 06/27/2021 at 02:41		Download
wart.h Sample wart.h file for your listening enjoyment. h - 974.75 kB - 06/27/2021 at 02:41		Download
wart.ino Arduino project file (only six lines long!). ino - 205.00 bytes - 06/27/2021 at 02:41		Download