How to Use Voice Playback Module: Examples, Pinouts, and Specs

The PEMENOL Voice Playback Module (Part ID: 11) is a versatile device designed to store and play back audio recordings. It is commonly used in applications such as toys, alarms, interactive devices, and other systems requiring pre-recorded audio playback. This module is compact, easy to integrate, and supports high-quality audio output, making it ideal for both hobbyist and professional projects.

The following table outlines the key technical details of the PEMENOL Voice Playback Module:

The PEMENOL Voice Playback Module has the following pin configuration:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V DC power source and the GND pin to ground.
2. Connect a Speaker: Attach a speaker to the SPK+ and SPK- pins for audio output. Alternatively, use the AUX output for external audio devices.
3. Control Playback:
   • Use the PLAY pin to trigger audio playback. A HIGH signal starts playback.
   • Use the NEXT and PREV pins to navigate through audio files.
   • Set the LOOP pin HIGH to enable continuous playback of the current audio file.
4. Serial Communication: For advanced control, connect the TX and RX pins to a microcontroller (e.g., Arduino UNO) to send commands via UART.

• Ensure the power supply voltage is within the specified range (3.3V to 5V) to avoid damaging the module.
• Use a decoupling capacitor (e.g., 10µF) across the VCC and GND pins to stabilize the power supply.
• If using UART communication, configure the baud rate to 9600 bps (default setting).
• Avoid connecting a speaker with an impedance lower than 8 ohms to prevent overloading the module.

Below is an example of how to control the PEMENOL Voice Playback Module using an Arduino UNO:

// Example code to control PEMENOL Voice Playback Module with Arduino UNO
// Connect the module's TX pin to Arduino pin 10 and RX pin to pin 11
// Use SoftwareSerial for UART communication

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial voiceModule(10, 11); // RX, TX

void setup() {
  // Initialize serial communication with the module
  voiceModule.begin(9600);
  Serial.begin(9600); // For debugging

  // Send a command to play the first audio file
  Serial.println("Sending play command...");
  voiceModule.write(0x01); // Command to play the first audio file
}

void loop() {
  // Example: Send a command to play the next audio file every 10 seconds
  delay(10000);
  Serial.println("Sending next command...");
  voiceModule.write(0x02); // Command to play the next audio file
}

1. No Audio Output:

   • Ensure the speaker is properly connected to the SPK+ and SPK- pins.
   • Verify that the power supply voltage is within the specified range.
   • Check if the audio files are correctly formatted (WAV or MP3) and stored in the module.

2. Playback Does Not Start:

   • Confirm that the PLAY pin is receiving a HIGH signal.
   • If using UART, ensure the baud rate is set to 9600 bps and the TX/RX connections are correct.

3. Distorted Audio:

   • Use a speaker with an impedance of at least 8 ohms.
   • Check for noise or instability in the power supply and add a decoupling capacitor if necessary.

4. Module Not Responding to UART Commands:

   • Verify the TX and RX connections between the module and the microcontroller.
   • Ensure the correct command format is being sent.

Q: Can I use this module with a 3.3V microcontroller?
A: Yes, the module supports an operating voltage range of 3.3V to 5V, making it compatible with 3.3V microcontrollers.

Q: How many audio files can the module store?
A: The module has an internal storage capacity of up to 8MB, which can store multiple audio files depending on their size and format.

Q: Can I control the volume of the audio output?
A: Volume control is not directly supported via GPIO pins. However, you can adjust the volume of the audio files before uploading them to the module.

Q: Is it possible to use an external amplifier with this module?
A: Yes, you can connect the AUX output to an external amplifier for higher audio output power.