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 sound output. This module provides a simple and efficient way to add audio functionality to your projects, making it ideal for hobbyists, educators, and professionals alike.

The PEMENOL Voice Playback Module is equipped with the following technical features:

• Manufacturer Part ID: 11
• Operating Voltage: 3.3V to 5V DC
• Current Consumption: < 50mA (during playback)
• Audio Format: WAV or AD4
• Storage Capacity: Up to 8MB (via onboard flash memory or external storage)
• Playback Modes: Single playback, loop playback, and trigger-based playback
• Output: Mono audio output (speaker or headphone)
• Control Interface: GPIO pins or serial communication
• Dimensions: 30mm x 20mm x 5mm

The module features a set of pins for power, control, and audio output. Below is the pinout table:

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 Audio Output: Attach a speaker to the SPK+ and SPK- pins. Ensure the speaker impedance matches the module's specifications (typically 8Ω).
3. Control Playback: Use GPIO pins from a microcontroller (e.g., Arduino UNO) to control playback, volume, and track selection via the PLAYE, NEXT, PREV, VOL+, and VOL- pins. Alternatively, use UART communication for more advanced control.
4. Load Audio Files: Store audio files in the supported format (WAV or AD4) onto the module's flash memory or an external storage device. Ensure file names and formats comply with the module's requirements.

• Power Supply: Use a stable power source to avoid noise or distortion in audio playback.
• Speaker Selection: Use a speaker with the recommended impedance (8Ω) and power rating to prevent damage to the module.
• Debounce Input Signals: If using mechanical switches to trigger playback, debounce the signals to avoid erratic behavior.
• Volume Control: Adjust the volume carefully to avoid overdriving the speaker or causing distortion.
• UART Communication: When using UART, ensure the baud rate matches the module's default setting (typically 9600 bps).

Below is an example of how to control the module using an Arduino UNO:

// Example code to control PEMENOL Voice Playback Module with Arduino UNO

// Define pin connections
#define PLAYE_PIN 2  // Pin connected to PLAYE (playback trigger)
#define NEXT_PIN 3   // Pin connected to NEXT (next track trigger)
#define VOL_UP_PIN 4 // Pin connected to VOL+ (volume up trigger)

void setup() {
  // Set pin modes
  pinMode(PLAYE_PIN, OUTPUT);
  pinMode(NEXT_PIN, OUTPUT);
  pinMode(VOL_UP_PIN, OUTPUT);

  // Initialize pins to HIGH (inactive state)
  digitalWrite(PLAYE_PIN, HIGH);
  digitalWrite(NEXT_PIN, HIGH);
  digitalWrite(VOL_UP_PIN, HIGH);
}

void loop() {
  // Trigger playback
  digitalWrite(PLAYE_PIN, LOW); // Active low signal
  delay(500);                  // Wait for 500ms
  digitalWrite(PLAYE_PIN, HIGH); // Deactivate trigger

  delay(2000); // Wait for 2 seconds before the next action

  // Skip to the next track
  digitalWrite(NEXT_PIN, LOW); // Active low signal
  delay(500);                  // Wait for 500ms
  digitalWrite(NEXT_PIN, HIGH); // Deactivate trigger

  delay(2000); // Wait for 2 seconds before the next action

  // Increase volume
  digitalWrite(VOL_UP_PIN, LOW); // Active low signal
  delay(500);                    // Wait for 500ms
  digitalWrite(VOL_UP_PIN, HIGH); // Deactivate trigger

  delay(5000); // Wait for 5 seconds before repeating the loop
}

1. No Sound Output

   • Cause: Incorrect speaker connection or incompatible speaker impedance.
   • Solution: Verify the speaker is connected to SPK+ and SPK- and matches the recommended impedance (8Ω).

2. Distorted Audio

   • Cause: Insufficient power supply or overdriven speaker.
   • Solution: Use a stable power source and ensure the volume is not set too high.

3. Playback Not Triggering

   • Cause: Incorrect wiring or signal levels.
   • Solution: Check the connections to the PLAYE pin and ensure the trigger signal is active low.

4. UART Communication Fails

   • Cause: Mismatched baud rate or incorrect wiring.
   • Solution: Verify the baud rate is set to 9600 bps and check the TX/RX connections.

• Q: Can I use headphones instead of a speaker?
  A: Yes, but ensure the headphones are compatible with the module's output specifications.

• Q: How many audio files can the module store?
  A: The number of files depends on the total storage capacity (up to 8MB) and the size of each file.

• Q: Can I control the module without a microcontroller?
  A: Yes, you can use mechanical switches connected to the control pins for basic functionality.

• Q: What is the maximum playback duration?
  A: The duration depends on the size of the audio files and the available storage capacity.

This documentation provides a comprehensive guide to using the PEMENOL Voice Playback Module effectively. For further assistance, refer to the manufacturer's datasheet or contact technical support.