MIDI Digital Music Module is a professional music synthesis module based on the General MIDI 2.0 standard, featuring complete MIDI audio processing and output capabilities. The module is equipped with a rich wavetable sound library, including 128 General MIDI tones and 128 extended tones, as well as dozens of professional percussion sounds. The module supports 16 independent MIDI channels, with Channel 9 dedicated to professional percussion sounds, enabling complex multi-channel music arrangement. In terms of audio processing, the module supports up to 64-voice polyphony simultaneously (without effects) or 38-voice polyphony with effects, featuring 32-note polyphonic processing capability to ensure smooth multi-part performance. The module integrates a professional-grade audio effects system, featuring a built-in 4-band parametric equalizer, multiple reverb and chorus effects, and a stereo audio amplifier that allows direct playback through headphones or speakers. By inputting standard MIDI signals via the serial interface, it outputs high-fidelity stereo audio. This module is compatible with mainstream controllers such as Arduino, micro:bit, and ESP32, making it suitable for applications including electronic instrument design, educational programming kits, and various embedded audio systems. It provides a complete audio solution for embedded music applications. Note: When using headphones for playback, some types of headphones are not compatible with this module and may cause playback issues. It is recommended to use 4-pole (TRRS) headphones. For optimal audio performance, the recommended load speaker specification is 4Ω impedance with a 3W rated power. Under this condition, the amplifier can achieve its nominal maximum output power while ensuring good frequency response and low distortion characteristics.
| Parameter | Specification |
|---|---|
| Baud Rate | 31.25 × (1 ± 0.01) Kbaud |
| Operating Voltage | 5V/3.3V |
| Interface | PH2.0 pitch connector |
| Connection Method | PH2.0 3-pin anti-reverse connection cable |
| Dimensions | 38.4 × 30.4 mm (compatible with LEGO bricks and M4 screw mounting holes) |
| Headphone Jack Diameter | 3.5 mm |
| Support Board | Arduino、ESP32 |
| Pin | Specification |
|---|---|
| G | GND |
| V | 5V/3.3V |
| S | Signal |
The module adopts a multi-channel synthesizer architecture with 16 independent MIDI channels (0–15, with Channel 9 dedicated to percussion/rhythm). Each channel can be independently configured with instrument timbre, volume, pan, and various effects parameters, enabling complex multi-part music arrangement.
Channels 0–8, 10–15: Melodic instrument channels Channel 9: Dedicated percussion channel supporting multiple drum kit sound sets All channels support real-time timbre switching and parameter control
The module features two complete sound banks, plus a dedicated percussion sound bank for Channel 9:
- Standard GM Sound Bank (Bank 0): 128 General MIDI instrument tones
- Expanded Sound Bank (Bank 127): 128 enhanced and special tones
- Dedicated Percussion Bank: Multiple professional drum kits, accessible via Channel 9
Built-in DSP effects processing engine delivering broadcast-quality audio:
- 4-band parametric equalizer: Independent adjustment for Low / Low-Mid / High-Mid / High frequencies
- Each band supports ±12 dB gain adjustment
- Supports channel-independent EQ settings
- Reverb Effects: Multiple reverb types including Room Reverb, Hall Reverb, Plate Reverb, Church Reverb, and more
- Chorus Effects: Multiple chorus types including Stereo Chorus, Ensemble Chorus, Flanger Chorus, and more
- Pan Control: Precise stereo positioning adjustment
Click here download ATSAM2695 datasheet PDF of the schematic
Click here view Arduino Library API Documentation
Click here download Arduino example program
- Channel 9 Percussion Playback – Demonstrates drum kit playback via the dedicated percussion channel
- GM Sound Bank Melody Playback – Plays a melody using the Steel String Guitar from the standard GM sound bank
- ESP32 MicroPython Example: Click here to download the ESP32 MicroPython example program
Microbit MakeCode extension link: https://github.com/emakefun-makecode-extensions/emakefun_midi