MP3 Player based on ESP32 C3

Here is my MP3 Player. I tried to use only cheep components so anyone can try it to.

Gus

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Description

I published the code and wiring schematic for my MP3 player on github and open-sourced it.
It is based on the ESP32-C3 Super Mini. The system reads SD cards up to 32GB (FAT32 format only), organizes files and folders in alphabetical order, and plays all the tracks within a selected folder. It features a navigation manager, recognizes artist and track names (if available), keeps track of elapsed playback time, and includes volume, play, pause, next, and back controls.

You can clone the project at the github link on the post! =)

Key limitations to keep in mind:
- No seeking: The system does not support fast-forwarding or rewinding; tracks play from start to finish;
- Resource usage: The file manager is somewhat resource-heavy, so I paused the audio buffer during menu browsing to ensure smooth and pleasant navigation;
- File compatibility: Please place only MP3 files in the SD card folders. Other file extensions may cause unexpected behavior.

Files

Schematics.png Portable Network Graphics (PNG) - 175.42 kB - 07/22/2026 at 23:54		Preview

mp3_01.ino ino - 10.12 kB - 07/22/2026 at 23:54		Download
README.md md - 1.62 kB - 07/22/2026 at 23:54		Download
LICENSE license - 1.06 kB - 07/22/2026 at 23:54		Download
read_sd.h h - 838.00 bytes - 07/22/2026 at 23:54		Download

View all 7 files

Components

1 × ESP32 C3 Super Mini
1 × DAC PCM5102a
1 × Monocrome OLED Display I2C 128x64px
1 × Standard SPI Micro SD Reader Module
1 × TP4056 Batery Recharger

View all 11 components

Build Instructions

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1
Here is the schematics for the wiring:
Controls
- Pin 0: Potenciometer
- Pin 1: Button Down
- Pin 2: Button Up
- Pin 8: Button Enter
DAC
- Pin 3: DIN
- Pin 20: BCK
- Pin 21: LRCK
- Jumper H4L on LOW State
- XSMT (3) on VIN
SD Card Module
- Pin 4: SCK
- Pin 5: MISO
- Pin 6: MOSI
- Pin 7: CS
OLED Display
- Pin 9: SCK
- Pin 10: SDA