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onda is a pocket FLAC player built on the Freenove ESP32-S3 Display (FNK0104B). It plays FLAC files from the board's microSD card on the built-in speaker, or on headphones through an external PCM5102 DAC. The touch interface is inspired by Spotify and written with LVGL 9.5.

Screenshots come from a desktop build of the interface with a made-up demo library.

What it does

• Lossless FLAC playback, 8–32 bit, up to 96 kHz (176.4/192 kHz files are decimated to 88.2/96 kHz)
• Library built from your tags: albums, artists, genres, .m3u playlists, Liked songs, play counts
• Headphones switch on by themselves when you plug them in, and the music pauses when you unplug them
• Control center (swipe up from the bottom edge): output, volume, brightness, battery, Wi-Fi
• Voice search on the device, without internet (experimental, off by default)
• Timer set to the second (pasta, highline) or stopwatch, with beeps over the music
• USB disk: over the USB-C cable the microSD shows up on your computer like a flash drive
• Wi-Fi web page to upload music, edit tags, fix covers and build playlists, with MusicBrainz lookup
• BOOT button works as a power button: screen off while the music keeps playing, play/pause, power off
• Battery level, charge detection and runtime estimate on a 3.7 V LiPo
• Resumes the same song at the same position after power-off, and even after a crash
• Interface in English or Italian

Pages

Hardware	The board, the PCM5102 DAC, the headphone jack and the battery: wiring and pins
Building and Flashing	Arduino IDE or arduino-cli settings, configuration options
SD Card and Library	How to organise the card, which tags are read, playlists, covers
Using the Player	Screens, gestures, now playing, queue, control center
Battery and Power	BOOT button, screen timeout, auto power-off, charging, runtime
USB Disk	The microSD on your computer over the USB-C cable, without taking it out
Web Interface	File transfer, tag editor, covers, MusicBrainz, playlists
Voice Search	Searching your library by voice, offline (experimental, off by default)
Session Timer and Clock	The timer and where the time comes from
Language and Translations	Switching language and adding translations
Troubleshooting	Crash reports, no sound, detection problems, known limits
Architecture	How the firmware is put together, for contributors

The wiki is generated from docs/wiki in the repository: to change a page, edit the file there and open a pull request.