ISD1820 Voice Audio Recording and Playback Module

The ISD1820 Voice Audio Recording and Playback Module records up to 10 seconds of audio through its onboard microphone, storing it on the ISD1820 chip’s built-in non-volatile flash memory, operating from 3V to 5V DC, with a 20cm cable for connecting an external 8 Ohm, 0.5W speaker (not included). Unlike RAM-based audio buffers that lose recorded content when power is cut, this voice recorder module retains its recording permanently across power cycles — recording once and replaying indefinitely without needing a microcontroller or any active power to preserve the audio.

The isd1820 voice recorder’s three hardware playback trigger modes give useful flexibility: an edge-triggered mode plays the recording once per button press, a level-triggered mode loops the recording continuously while the trigger pin is held active, and a third mode plays a single non-interruptible message through to completion regardless of further button presses. This isd1820 module’s trigger pins can be driven by Arduino digital outputs for automated playback in sensor-triggered announcement systems.

sound playback module overwrites its entire stored recording each time a new recording is made — it cannot store multiple separate clips or select between different recordings, so projects needing multiple audio messages would require multiple modules or a different audio playback solution. This StemVolt module is well-suited for engineers building automated voice announcement systems and practical non-volatile audio playback electronics projects.

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Features:

• Non-volatile flash memory retains recording across power cycles
• Three playback trigger modes: edge, level-loop, and single-complete
• Up to 10 seconds recording time stored directly on the chip
• Trigger pins driven by Arduino for automated sensor-triggered playback
• 3V to 5V compatible with Arduino and battery-powered setups

Pin diagram of ISD1820 Module:

Technical specifications:

 Applications:

• ISD1820 used for Arduino sensor-triggered voice announcement build
• Retail shop uses isd1820 voice recorder for India automated greeting message
• Alarm system uses isd1820 module for pre-recorded alert announcement
• Museum exhibit uses sound playback module for looping audio description

Package includes:

• 1 x ISD1820 Voice Audio Recording and Playback Module