How to Use SparkFun ISD1932 Voice Recorder Breakout v1.1: Examples, Pinouts, and Specs

The SparkFun ISD1932 Voice Recorder Breakout v1.1 (Manufacturer Part ID: BOB-09579) is a compact and versatile voice recording module designed for audio recording and playback applications. It features a built-in microphone, speaker output, and configurable recording durations, making it an excellent choice for projects requiring sound playback or voice prompts. The module is based on the ISD1932 chip, which provides high-quality audio recording and playback capabilities.

• Interactive voice prompts for embedded systems
• Audio playback for toys and educational devices
• Voice reminders or alarms
• Sound effects for DIY projects
• Prototyping audio-enabled IoT devices

The following table outlines the key technical details of the SparkFun ISD1932 Voice Recorder Breakout v1.1:

The breakout board has the following pin layout:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to ground.
2. Recording Audio:
   • Connect a push-button between the REC pin and GND.
   • Press and hold the button to start recording. Release the button to stop recording.
3. Playback Audio:
   • For edge-triggered playback, connect a push-button between the PLAYE pin and GND. Press the button to play the recorded audio once.
   • For level-triggered playback, connect a push-button between the PLAYL pin and GND. The audio will play as long as the button is held down.
4. Speaker Connection: Connect an 8Ω speaker to the SP+ and SP- pins for audio output.
5. Optional Feed-Through Mode: To monitor audio in real-time, connect the FT pin to GND.

• Ensure the power supply voltage is within the specified range (2.4V to 5.5V) to avoid damaging the module.
• Use an 8Ω speaker for optimal audio output. Higher impedance speakers may result in lower volume.
• Avoid recording in noisy environments to achieve better audio quality.
• If using an external microcontroller (e.g., Arduino), ensure proper debounce handling for push-button inputs.

The following example demonstrates how to control the ISD1932 module using an Arduino UNO:

// Pin definitions for the ISD1932 module
const int REC_PIN = 2;    // Pin connected to the REC pin on the module
const int PLAYE_PIN = 3;  // Pin connected to the PLAYE pin on the module

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

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

void loop() {
  // Example: Record audio for 5 seconds
  digitalWrite(REC_PIN, LOW);  // Start recording
  delay(5000);                 // Record for 5 seconds
  digitalWrite(REC_PIN, HIGH); // Stop recording
  delay(2000);                 // Wait for 2 seconds

  // Example: Play the recorded audio
  digitalWrite(PLAYE_PIN, LOW);  // Trigger playback
  delay(100);                    // Short delay to ensure edge trigger
  digitalWrite(PLAYE_PIN, HIGH); // End playback trigger
  delay(5000);                   // Wait for playback to finish
}

1. No Audio Output:

   • Ensure the speaker is properly connected to the SP+ and SP- pins.
   • Verify that the module is powered correctly (check VCC and GND connections).
   • Check if the recording process was successful.

2. Poor Audio Quality:

   • Record in a quieter environment to reduce background noise.
   • Ensure the microphone is not obstructed or damaged.
   • Use the appropriate sampling rate for your application.

3. Playback Not Triggering:

   • Confirm that the PLAYE or PLAYL pin is correctly connected to a push-button or microcontroller.
   • Check for loose or faulty connections.

4. Module Not Responding:

   • Verify that the power supply voltage is within the specified range.
   • Inspect all connections for shorts or loose wires.

Q: Can I use an external microphone with this module?
A: No, the module is designed to work with its built-in microphone. External audio input is supported via the feed-through mode.

Q: How can I extend the recording duration?
A: The recording duration is fixed and depends on the sampling rate. Lowering the sampling rate increases the duration but reduces audio quality.

Q: Can I use this module with a 3.3V microcontroller?
A: Yes, the module operates within a voltage range of 2.4V to 5.5V, making it compatible with 3.3V systems.

Q: Is it possible to store multiple recordings?
A: No, the ISD1932 chip supports only one recording at a time. New recordings overwrite the previous one.