Monday Kids Voice Playback Module MP3 Voice Prompts Voice Broadcast Device For Arduino MP3 Music Player Development Board
$7.71
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SKU
EK559
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MP3 Module User Manual
1. Encoded Control Description
In addition to direct triggering for up to 9 MP3 tracks, this module supports on-demand playback selection for up to 31 MP3 tracks when integrated with a microcontroller (MCU).
Before powering on the module, connect pin A10 to Ground (GND) as indicated in the diagram. Upon power-up, the module will enter Encoding Control Mode.
Pins A1–A5 serve as encoding control ports operating in active-low inverted binary code, where A1 represents the least significant bit (LSB).
The mapping for track selection is detailed in the table below:
| No. | A5 | A4 | A3 | A2 | A1 | Action |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1 | 0 | Play Track 001 |
| 2 | 1 | 1 | 1 | 0 | 1 | Play Track 002 |
| 3 | 1 | 1 | 1 | 0 | 0 | Play Track 003 |
| 4 | 1 | 1 | 0 | 1 | 1 | Play Track 004 |
| 5 | 1 | 1 | 0 | 1 | 0 | Play Track 005 |
| 6 | 1 | 1 | 0 | 0 | 1 | Play Track 006 |
| 7 | 1 | 1 | 0 | 0 | 0 | Play Track 007 |
| 8 | 1 | 0 | 1 | 1 | 1 | Play Track 008 |
| 9 | 1 | 0 | 1 | 1 | 0 | Play Track 009 |
| 10 | 1 | 0 | 1 | 0 | 1 | Play Track 010 |
| 11 | 1 | 0 | 1 | 0 | 0 | Play Track 011 |
| 12 | 1 | 0 | 0 | 1 | 1 | Play Track 012 |
| 13 | 1 | 0 | 0 | 1 | 0 | Play Track 013 |
| 14 | 1 | 0 | 0 | 0 | 1 | Play Track 014 |
| 15 | 1 | 0 | 0 | 0 | 0 | Play Track 015 |
| 16 | 0 | 1 | 1 | 1 | 1 | Play Track 016 |
| 17 | 0 | 1 | 1 | 1 | 0 | Play Track 017 |
| 18 | 0 | 1 | 1 | 0 | 1 | Play Track 018 |
| 19 | 0 | 1 | 1 | 0 | 0 | Play Track 019 |
| 20 | 0 | 1 | 0 | 1 | 1 | Play Track 020 |
| 21 | 0 | 1 | 0 | 1 | 0 | Play Track 021 |
| 22 | 0 | 1 | 0 | 0 | 1 | Play Track 022 |
| 23 | 0 | 1 | 0 | 0 | 0 | Play Track 023 |
| 24 | 0 | 0 | 1 | 1 | 1 | Play Track 024 |
| 25 | 0 | 0 | 1 | 1 | 0 | Play Track 025 |
| 26 | 0 | 0 | 1 | 0 | 1 | Play Track 026 |
| 27 | 0 | 0 | 1 | 0 | 0 | Play Track 027 |
| 28 | 0 | 0 | 0 | 1 | 1 | Play Track 028 |
| 29 | 0 | 0 | 0 | 1 | 0 | Play Track 029 |
| 30 | 0 | 0 | 0 | 0 | 1 | Play Track 030 |
| 31 | 0 | 0 | 0 | 0 | 0 | Play Track 031 |
2. MCU Control Example
Based on the encoding table above, 0 represents Low Level (GND) and 1 represents High Level (VCC).
After outputting the corresponding code from the MCU I/O ports, hold the state for 200–500 ms (or longer), then restore to the default state (High Level) to trigger playback.
sbit A5 = P1^4; sbit A4 = P1^3; sbit A3 = P1^2; sbit A2 = P1^1; sbit A1 = P1^0; // Main control logic (e.g., triggering Track 003) A5=1; A4=1; A3=1; A2=0; A1=0; // Send code: 11100 Delay_ms(200); // Hold pulse for 200ms A5=1; A4=1; A3=1; A2=1; A1=1; // Restore default state: 11111
3. Technical Specifications
Power Supply: 5V DC / 1A
Trigger Inputs: 9 dedicated ports
Track Capacity: 9 tracks via direct triggers, 31 tracks via MCU encoding control
Speaker Output: 0–3W, 4–8Ω (Adjustable volume)
Max MicroSD Support: Up to 16GB
4. Precautions & Operating Notes
1. The operating voltage must not exceed 5.5V DC.
2. Supports speakers up to 3W (4–8Ω). When operating with a 3W speaker at high volume, monitor thermal performance and consider attaching a heatsink if necessary.
5. TF Card / MicroSD Directory Structure
To ensure proper file indexing on the TF card, follow this directory format:
1. Create a root folder named "01".
2. MP3 audio files inside the folder must be named starting with a 3-digit prefix (e.g., 001.mp3 through 999.mp3).
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