DFRobot Gravity Offline Voice Recognition Sensor I2C UART for Arduino ESP32

🎙️ DFRobot Gravity Offline Voice Recognition Module

121 Built-in Commands + 17 Custom Words, No Internet Needed

Overview

This Gravity Offline Speech Recognition Sensor from DFRobot is a plug-and-play module for human-computer interaction, voice assistants, and smart home projects. It works fully offline for enhanced privacy and reliability, and connects via I2C or UART to Arduino, micro:bit, ESP32, and Raspberry Pi boards.

Key Features121 Ready-to-Use Commands

Common words for education and smart home control work instantly, no setup required.

Self-Learning Function

Train up to 17 custom command words, including any sound or language.

Offline & Private

No cloud connection needed, ideal for schools, outdoor projects, and unstable networks.

Onboard Speaker & Mic

Highly integrated design with real-time voice response and simplified wiring.

SpecificationsOperating Voltage3.3 - 5VMax Operating Current≤370 mA (5V)CommunicationI2C / UARTI2C Address0x64Fixed Commands121Custom Commands17Microphone Sensitivity-28dBModule Size49x32mm (1.93x1.26in)Operating Temperature0-70°CPackage Contents

Gravity Voice Recognition Module (I2C & UART) x1
Gravity-4P I2C/UART Sensor Connector x1

Product ImagesFAQDoes it need internet access?

No, this module operates fully offline for maximum privacy and reliability.

What boards is it compatible with?

Arduino UNO, micro:bit, ESP32, and Raspberry Pi via I2C or UART.

Can I add my own voice commands?

Yes, up to 17 custom commands can be trained using any sound or language.