MP3 Player
Mini music player based on Raspberry Pi Pico 2.
Author: Liță Gabriel-Laurențiu
GitHub Project Link: https://github.com/UPB-PMRust-Students/proiect-gabruellita
Description
The project consists of a mini music player built around a Raspberry Pi Pico 2, capable of:
- Playing music from a microSD card.
- Displaying song information on a small LCD screen.
- Supporting play, pause, next, and previous controls through physical buttons.
- Using Rust with Embassy for efficient multitasking.
At first, the device will play audio through a small speaker connected via a PAM8403 mini amplifier.
Optionally, if the basic setup is successful, the player may be expanded with headphone jack output and/or Bluetooth audio support.
Motivation
I wanted a simple external device that can play and control music independently without being tied to a laptop.
Rust and Embassy provide the necessary performance and multitasking tools to manage this efficiently on the Raspberry Pi Pico.
Architecture
The Raspberry Pi Pico 2W acts as the brain of the system, managing all peripherals:
- microSD card: Stores the audio files.
- DFPlayer Mini: Handles audio file playback directly from the SD card.
- Speaker (through PAM8403 amplifier): Outputs the audio.
- LCD 1602 + I2C interface: Displays the current track information and playback status.
- Buttons: Allow control of music playback.
Data flow:
- Pico sends commands to the DFPlayer Mini via UART.
- DFPlayer plays the file and outputs audio to the amplifier and then the speaker.
- Pico updates the LCD and handles button presses asynchronously.
Diagrama Block
Components
| Component | Purpose | Details |
|---|---|---|
| Raspberry Pi Pico 2W | Main controller | Runs firmware and manages all components |
| microSD card + adapter | Storage | Holds audio files |
| DFPlayer Mini | MP3 player module | Reads and plays audio from SD |
| PAM8403 Mini Amplifier | Audio amplification | Boosts the signal for speaker output |
| Speaker | Audio output | Basic sound output |
| LCD 1602 with I2C Interface | Display | Shows track info and playback status |
| Push Buttons | User control | Play, Pause, Next, Previous actions |
Hardware Overview
- The Pico controls the music player by sending commands over UART to the DFPlayer Mini.
- DFPlayer Mini reads the audio files from the microSD card.
- The audio output is amplified by the PAM8403 amplifier and played through a small speaker.
- The LCD 1602 displays song and status info via the I2C interface.
- Buttons provide direct user interaction for playback controls.
Optional Features (Future Extensions)
If the basic functionality is successfully implemented, the project could be extended with:
-
Headphone Jack Output:
Using a 3.5mm Audio Jack Module, allowing headphone connections. -
Bluetooth Audio Output:
Integrating a Bluetooth Audio Receiver Module to allow wireless music playback. -
High-Power Amplifier Upgrade:
Switching from the PAM8403 to a more powerful TPA3118 amplifier for better speaker output.
Note: These features are optional and depend on the success of the core implementation.
Bill of Materials (Hardware)
| Product Code | Device | Usage | Price |
|---|---|---|---|
| 0104110000013743 | DFPlayer Mini MP3 Module | Audio playback from microSD | 13,99 lei |
| 0104110000003584 | LCD 1602 + I2C Interface | Display song info | 16,34 lei |
| 0104110000035356 | TPA3118 Mono Audio Amplifier (60W) | High power audio (optional) | 19,99 lei |
| 0104110000003737 | PAM8403 Mini Stereo Amplifier (3W) | Basic speaker amplification | 2,99 lei |
| 0104110000006547 | 3.5mm Audio Jack Module | Headphone output (optional) | 4,99 lei |
| 0104110000019561 | Bluetooth Audio Receiver Module | Wireless playback (optional) | 23,99 lei |
| 5056561803975 | Raspberry Pi Pico 2W | Main controller | ~39,66 lei |
| Setup Type | Components |
|---|---|
| Core Setup | Pico 2W, DFPlayer Mini, microSD, LCD 1602 I2C, Buttons, PAM8403, Speaker |
| Optional Setup | + 3.5mm Audio Jack, + Bluetooth Receiver, + TPA3118 Amplifier |
Software Design
Rust will be used for firmware development, utilizing asynchronous programming with Embassy.
| Library | Purpose | Description |
|---|---|---|
| embassy-rp | Raspberry Pi Pico-specific drivers | Accesses and controls RP2040 peripherals (UART, GPIO, I2C, etc.) |
| embassy | Async executor | Manages efficient multitasking |
| embedded-hal | Hardware abstraction layer | Unified API for embedded peripherals |
| ssd1306 | Display driver | Controls the LCD screen through I2C |
| heapless | Static data structures | Provides memory-safe buffers without dynamic allocation |
| embedded-sdmmc | SD card filesystem | Handles file reading from microSD |
| DFPlayer Mini UART driver (to be implemented) | Serial commands | Sends control commands to DFPlayer Mini module |
Functional Diagram
Log
(To be completed as the project progresses)
Photos
(To be added after prototype assembly)
Links
(To be added once resources and documentation are finalized)