ISD1820 Voice Recording Module

The ISD1820 voice recording module is a simple and cost-effective solution for integrating audio into your electronic projects. Based on the ISD1820 chip from Dallas Semiconductor (now Maxim Integrated), this all-in-one integrated circuit allows you to record, erase, and playback voice messages without requiring complex external microcontrollers or dedicated Flash memory.

This module is ideal for creating voice boxes, sound alarms, or simple audio interactions with your Arduino, ESP32, or other microcontroller boards. It offers significant autonomy due to its low power consumption and supports up to 10 minutes of continuous recording depending on the selected sampling frequency.

Specifications

• Main chip: ISD1820 (Dallas/Maxim)
• Maximum recording time: 10 minutes
• Supply voltage: 2.4 V to 5.5 V
• Sampling frequency: 8 kHz (standard voice quality)
• Interface: Digital (ERASE, PLAY, REC, P-LED, MISC signals)
• Non-volatile memory: retains data without power
• Audio output: direct via low-impedance speaker (8 Ω) or amplified
• Recording format: PAM (Pulse Amplitude Modulation)

For better sound reproduction, it is recommended to add an external audio amplifier if the direct speaker connection is insufficient. Numerous libraries and tutorials are available to easily integrate this module into Arduino IDE environments.