ISD1820 Replayable Voice Module – High Clarity Mic Embedded [NEW]

SKU: FA2044-0-1
Operating Voltage

3V – 5V DC
Recording Duration

10 Seconds (Standard Configuration)
Audio Storage

Integrated Non-Volatile Flash (100-year retention)
Microphone Type

High-Sensitivity Embedded Condenser
Speaker Output

8Ω, 0.5W (JST/Pin compatible)
Control Interface

3.3V / 5V TTL Logic or Manual Buttons
Sampling Frequency

6.4 kHz
Board Dimensions

38mm x 42.5mm
Product Description
The [NEW] ISD1820 Replayable Voice Module is an upgraded audio capture solution featuring an enhanced, high-sensitivity embedded microphone for superior voice clarity. This compact board allows users to record, store, and playback high-fidelity voice messages or sound effects without the need for complex programming or external storage media.
Utilizing specialized internal flash memory, the module ensures that your recordings remain intact even after the power is disconnected (Non-Volatile Storage). This new version is specifically tuned for better signal-to-noise ratios, making it ideal for clear verbal instructions, custom alerts, or interactive greeting devices. Whether operated as a standalone unit with the onboard tactile buttons or integrated into a microcontroller-based system (Arduino/Raspberry Pi/STM32), it provides a robust and reliable audio interface for any project.
Key Features
  • Upgraded High-Clarity Mic: Features a premium embedded electret microphone for crisp, natural-sounding voice capture.
  • Non-Volatile Memory: Audio is saved directly to the chip’s internal flash; no battery backup is required to keep the recording.
  • Three Playback Modes:
    • PLAYE (Edge): One-touch playback of the entire message.
    • PLAYL (Level): Plays only while the button is held (useful for momentary prompts).
    • Repeat/Loop: Continuous playback capability via onboard jumper setting.
  • Zero-Programming Operation: Record and play instantly using physical buttons—no code required for basic use.
  • MCU Compatible: Standard 2.54mm headers allow for easy triggering via 3.3V or 5V logic from any microcontroller.
  • Built-in Amplifier: Includes a powerful onboard driver capable of powering the included 8Ω 0.5W speaker at high volume levels.
Usage & Applications
  • Custom Greeting Cards/Gifts: Create personalized, high-quality audio messages for special occasions.
  • Security & Safety Alerts: Integrate with motion sensors to play “Intruder Alert” or safety instructions in hazardous areas.
  • Industrial Machine Prompts: Add voice-guided operation steps to control panels or heavy machinery.
  • Educational Projects: A favorite for STEM students building talking robots, interactive maps, or science fair displays.
  • Assistive Technology: Develop low-cost communication aids for individuals with speech or visual impairments
Q: How does the "High Clarity" microphone differ from the standard version?

This [NEW] version utilizes a higher-grade microphone element and optimized circuitry to reduce background hiss and improve the frequency response of vocal recordings compared to generic modules.

Q: Can I record over a previous message?

Yes. Simply press and hold the REC button to start a new recording. The previous message is automatically overwritten. There is no limit to how many times you can re-record.

Q: Can I use a larger speaker for more volume?

The onboard amplifier is designed for 0.5W. While it can drive slightly larger 8Ω speakers, if you need significantly more volume (e.g., for a large room), you should connect the audio output to an external amplifier module.

Q: Is it compatible with 3.3V systems like the Raspberry Pi or ESP32?

Yes. The control pins accept 3.3V logic levels, making it safe to use with modern low-power microcontrollers.

Q: What happens if I want a recording longer than 10 seconds?

The 10-second limit is set by the sampling rate resistor on the board. You can increase the time up to 20 seconds by changing a resistor, though this will slightly reduce the audio quality.

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