Isd1820: A Voice Recorder Module Guide

Introduction to the ISD1820 Voice Recorder Module

The ISD1820 is a versatile and user-friendly voice recorder module that allows you to record and playback audio with ease. This module is widely used in various applications, such as toys, greeting cards, and interactive projects. In this comprehensive guide, we will explore the features, specifications, and usage of the ISD1820 voice recorder module.

Key Features of the ISD1820 Module

Recording time: Up to 10 seconds
Audio quality: 8-bit resolution, 8kHz sampling rate
Easy-to-use interface with record, playback, and erase functions
Low power consumption
Compact size: 37mm x 54mm
Compatible with Arduino, Raspberry Pi, and other microcontrollers

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Understanding the ISD1820 Module

ISD1820 Module Specifications

Specification	Value
Supply Voltage	2.4V to 5.5V
Recording Time	Up to 10 seconds
Audio Quality	8-bit resolution, 8kHz sampling rate
Audio Output	PWM (Pulse Width Modulation)
Dimensions	37mm x 54mm
Weight	Approximately 10g

ISD1820 Module Pinout

The ISD1820 module has a simple pinout consisting of the following pins:

Pin	Description
VCC	Power supply (2.4V to 5.5V)
GND	Ground
REC	Record button input
PLAYE	Playback/Erase button input
P-E	Playback/Erase mode selection
SPK_1	Speaker positive output
SPK_2	Speaker negative output

Setting Up the ISD1820 Module

Hardware Setup

To set up the ISD1820 module, follow these steps:

Connect the VCC pin to a power supply (2.4V to 5.5V).
Connect the GND pin to the ground of your power supply.
Connect a pushbutton between the REC pin and ground for recording.
Connect a pushbutton between the PLAYE pin and ground for playback/erase.
Connect the P-E pin to VCC for playback mode or ground for erase mode.
Connect a speaker or audio amplifier to the SPK_1 and SPK_2 pins.

Software Setup (Arduino Example)

To use the ISD1820 module with an Arduino, you can follow this example code:

const int recordPin = 2;
const int playPin = 3;
const int PEPin = 4;

void setup() {
  pinMode(recordPin, INPUT_PULLUP);
  pinMode(playPin, INPUT_PULLUP);
  pinMode(PEPin, OUTPUT);
}

void loop() {
  if (digitalRead(recordPin) == LOW) {
    digitalWrite(PEPin, HIGH);
    delay(10000); // Record for 10 seconds
    digitalWrite(PEPin, LOW);
  }

  if (digitalRead(playPin) == LOW) {
    digitalWrite(PEPin, HIGH);
    delay(10000); // Playback for 10 seconds
    digitalWrite(PEPin, LOW);
  }
}

In this example, we define the pins for recording, playback, and P-E mode selection. The setup() function configures the pin modes, and the loop() function checks for button presses to trigger recording or playback.

Recording and Playback with the ISD1820 Module

Recording Audio

To record audio with the ISD1820 module, follow these steps:

Ensure that the module is properly set up as described in the “Setting Up the ISD1820 Module” section.
Press and hold the record button connected to the REC pin.
Speak or play the audio you wish to record near the microphone on the module.
Release the record button when you have finished recording (maximum 10 seconds).

Playing Back Recorded Audio

To play back the recorded audio, follow these steps:

Ensure that the module is properly set up and the P-E pin is connected to VCC for playback mode.
Press and hold the playback button connected to the PLAYE pin.
The recorded audio will be played through the connected speaker or audio amplifier.
Release the playback button when you have finished listening to the audio.

Erasing Recorded Audio

To erase the recorded audio and start fresh, follow these steps:

Ensure that the module is properly set up and the P-E pin is connected to ground for erase mode.
Press and hold the playback/erase button connected to the PLAYE pin.
Keep the button pressed for approximately 5 seconds until you hear a click sound, indicating that the audio has been erased.
Release the playback/erase button.

Advanced Usage and Tips

Adjusting Audio Quality

The ISD1820 module records audio at an 8-bit resolution and 8kHz sampling rate. While this is sufficient for most applications, you can improve the audio quality by using an external audio amplifier or connecting the module to a higher-quality speaker.

Using Multiple ISD1820 Modules

If you require longer recording times or multiple audio segments, you can use multiple ISD1820 modules in parallel. To do this, connect each module’s VCC, GND, and P-E pins together, and use separate record and playback buttons for each module.

Triggering Playback with an External Signal

You can trigger audio playback using an external signal, such as a sensor or another microcontroller. To do this, connect the external signal to the PLAYE pin through a transistor or relay, ensuring that the signal is active low (i.e., pulls the PLAYE pin to ground when active).

Troubleshooting Common Issues

No Audio Recording or Playback

If you experience issues with recording or playback, check the following:

Ensure that the module is properly powered and connected to the correct pins.
Verify that the P-E pin is in the correct mode (VCC for playback, ground for erase).
Check the connections between the module and the speaker or audio amplifier.
Confirm that the record and playback buttons are functioning correctly.

Poor Audio Quality

If the recorded audio sounds distorted or has poor quality, consider the following:

Ensure that the module is not exposed to excessive noise or interference during recording.
Use a higher-quality microphone or audio source for recording.
Connect the module to a better speaker or audio amplifier for playback.
Adjust the volume of the audio source during recording to avoid clipping or distortion.

Frequently Asked Questions (FAQ)

Can I record audio longer than 10 seconds with the ISD1820 module?
No, the maximum recording time for the ISD1820 module is 10 seconds. If you require longer recording times, you can use multiple modules in parallel or consider using a different voice recorder module with a longer recording capacity.
Is it possible to play back the recorded audio at a different speed?
No, the ISD1820 module does not have built-in functionality to change the playback speed. The recorded audio will be played back at the same speed as it was recorded.
Can I connect the ISD1820 module directly to a microcontroller?
Yes, the ISD1820 module can be easily connected to microcontrollers such as Arduino or Raspberry Pi. Simply follow the hardware setup instructions and use the appropriate software libraries or example code to control the module.
How can I improve the sound quality of the recorded audio?
To improve the sound quality, ensure that the module is not exposed to excessive noise or interference during recording. You can also use a higher-quality microphone or audio source and connect the module to a better speaker or audio amplifier for playback.
Is it possible to store multiple audio recordings on the ISD1820 module?
No, the ISD1820 module can only store one audio recording at a time. If you need to store multiple recordings, you can use multiple modules in parallel or consider using a different voice recorder module with multi-recording capabilities.

Conclusion

The ISD1820 voice recorder module is a simple and effective solution for adding audio recording and playback functionality to your projects. With its easy-to-use interface, compact size, and low power consumption, the module is suitable for a wide range of applications, from toys and greeting cards to interactive installations and more.

By following this comprehensive guide, you should now have a solid understanding of the ISD1820 module’s features, specifications, and usage. You can confidently set up the module, record and play back audio, and troubleshoot common issues that may arise.

As you explore the possibilities of the ISD1820 module, feel free to experiment with different configurations, integrate it with other components, and create unique and engaging audio experiences in your projects. Happy recording and playback!