How to Use MKE-M11 UART Control MP3 Player Module: Examples, Pinouts, and Specs

The MKE-M11 UART Control MP3 Player Module is a compact and versatile audio playback device designed for integration into a wide range of electronics projects. It allows for high-quality MP3 playback from a microSD card and can be easily controlled through UART (Universal Asynchronous Receiver/Transmitter) communication, making it ideal for applications such as embedded audio systems, DIY music players, interactive art installations, and educational projects.

• DIY audio players
• Interactive exhibits
• Voice prompts for machines
• Educational tools for teaching electronics and programming
• Home automation audio feedback systems

• Supported Formats: MP3, WMA, WAV
• Supply Voltage: 3.2V - 5.25V
• Output Power: 2W (at 4Ω load)
• Signal-to-Noise Ratio (SNR): 85dB
• Communication Interface: UART (TTL serial)
• Baud Rate: Configurable (default 9600 bps)
• Storage: microSD card slot (supports up to 32GB)

1. Power Supply: Connect the VCC pin to a power source within the specified voltage range and the GND pin to the ground of your power supply.
2. Speaker Connection: Attach a speaker to the SPK1 and SPK2 pins, ensuring correct polarity.
3. UART Communication: Connect the module's TX pin to the RX pin of your microcontroller (e.g., Arduino UNO) and the RX pin to the TX pin of the microcontroller.
4. MicroSD Card: Insert a microSD card with MP3 files into the slot on the module.

• Ensure that the power supply voltage is within the specified range to prevent damage to the module.
• Format the microSD card to FAT16 or FAT32 and store the MP3 files in the root directory.
• Use a regulated power supply to minimize noise in audio playback.
• Keep the UART communication lines as short as possible to reduce interference.
• Avoid placing the module near strong electromagnetic fields.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {
  // Open serial communications:
  Serial.begin(9600);
  // Set the data rate for the SoftwareSerial port:
  mySerial.begin(9600);
  // Send command to play the first MP3 file:
  mySerial.write(0x7E);
  mySerial.write(0xFF);
  mySerial.write(0x06);
  mySerial.write(0x03);
  mySerial.write(0x00);
  mySerial.write(0x00);
  mySerial.write(0x01);
  mySerial.write(0xEF);
}

void loop() {
  // If there's any serial available, send it out the serial port:
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
}

Note: The above code is a simple example to demonstrate how to send a command to the MKE-M11 module to play the first MP3 file on the microSD card. The commands follow the module's communication protocol, which should be referenced for more advanced control.

• No Audio Output: Check the speaker connections, ensure the microSD card is properly inserted and contains valid MP3 files.
• Garbled Audio: Verify that the power supply is stable and within the specified voltage range. Also, check for loose connections.
• Module Not Responding to Commands: Ensure that the UART connections are correct and that the baud rate matches the module's settings.

• If you encounter issues, first check all connections and power supply voltages.
• Format the microSD card on a computer to ensure it is FAT16 or FAT32.
• Use a different microSD card to rule out card-related issues.
• Check the volume level in your MP3 files; it may be too low.
• Ensure that the serial communication is functioning correctly by sending simple commands and checking for responses.

FAQs:

Q: Can I connect this module directly to an Arduino UNO? A: Yes, you can connect it using the SoftwareSerial library as demonstrated in the example code.

Q: What is the maximum size of the microSD card that can be used? A: The module supports microSD cards up to 32GB in size.

Q: How do I change the volume? A: Volume control can be done through specific UART commands as per the module's communication protocol.

Q: Can I play files in a specific order? A: Yes, you can control the playback order through UART commands, allowing you to select specific files to play.

Q: Does the module support audio formats other than MP3? A: Yes, the module also supports WMA and WAV formats.