Voice Recorder is a device that captures speech (or audio) in various situations like meetings, lectures, interviews, conferences, broadcasts etc. so that you can easily edit or play them back.The most common sound playback module is ISD 1820 Voice Recorder Module. It is based on ISD1820, which is a multiple‐message record/playback device. It can offer true single‐chip voice recording, no‐volatile storage, and playback capability around 10-20 seconds. The module is very handy and easy to use with various microcontroller boards.
| Pin | Function |
| VCC | DC 2.4-5.5V |
| GND | Ground |
| FT | FeedThrough: This mode enables the Microphone to drive the speaker directly. |
| REC/REC (Button) | The module starts recording whenever REC is HIGH. |
| MIC | microphone input |
| P-E/PLAY-E (Button) | Playback, Edge‐activated |
| P-L/PLAY-L (Button) | Playback, Level‐activated, |
| SPI | The SP+ and SP‐ pins provide a direct drive for loudspeakers with impedances as low as8Ω. |
| Power Supply | 3.3V |
How to use
Tutorial – https://www.electronicshub.org/interfacing-isd1820-voice-recorder-module-with-arduino/
Common Applications
1. Security Systems
2. Accident voice recordings
3. Record message during collisions
Some example projects that students can try out in the ATL Lab
1. Make a voice recording project using Arduino and sound playback module
https://www.hackster.
2. Make a voice player project controlled by ultrasonic sensor (https://youtu.be/FB4AMvU5yXM)
YouTube Video
Safety Measures to Follow
1. The module contains delicate parts so it should be handled with care.
Important Links
1. The Science Behind Sound –
https://www.youtube.com/watch?v=24yESm63tSY
2. Video Tutorial
https://www.youtube.com/watch?v=TTY-NrZg-EI
