---
product_id: 740865091
title: "Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART"
brand: "dfrobot"
price: "R2519"
currency: ZAR
in_stock: false
reviews_count: 5
category: "Dfrobot"
url: https://www.desertcart.co.za/products/740865091-gravity-offline-language-learning-voice-recognition-sensor-for-micro-bit
store_origin: ZA
region: South Africa
---

# 17 custom self-learned commands I2C & UART plug-and-play 121 built-in commands Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART

**Brand:** dfrobot
**Price:** R2519
**Availability:** ❌ Out of Stock

## Summary

> 🎤 Own your smart space with offline voice mastery!

## Quick Answers

- **What is this?** Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART by dfrobot
- **How much does it cost?** R2519 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/740865091-gravity-offline-language-learning-voice-recognition-sensor-for-micro-bit)

## Best For

- dfrobot enthusiasts

## Why This Product

- Trusted dfrobot brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Custom Sound Training:** Empower your projects with 17 unique custom commands—train whistles, snaps, or even pet meows!
- • **Offline Privacy First:** No cloud needed—voice recognition happens locally, ensuring your data stays private and secure.
- • **121 Preloaded Commands:** Skip setup hassle with a vast library of fixed commands ready to trigger smart actions immediately.
- • **Real-Time Audio Feedback:** Built-in and external speaker support delivers instant voice confirmation for flawless interaction.
- • **Plug & Play Voice Control:** Seamlessly integrates with micro:bit, Arduino, and ESP32 for instant voice command activation.

## Overview

The Gravity Offline Language Learning Voice Recognition Sensor is a compact, privacy-focused module compatible with micro:bit, Arduino, and ESP32. Featuring 121 built-in commands plus 17 customizable ones, it supports I2C and UART communication with plug-and-play ease. Its offline operation ensures fast, secure voice control with real-time audio feedback, ideal for smart home automation, robotics, and interactive projects.

## Description

Introduction The Gravity: Offline Voice Recognition Sensor is an offline voice recognition module that utilizes a new offline voice recognition chip. It comes with 121 built-in commands and supports 17 custom commands, functioning even without an internet connection. It adopts a dual-microphone design for superior noise resistance, and is equipped with built-in and external speaker interfaces for real-time feedback. Compatible with various 3.3V or 5V controllers, it's an ideal choice for applications requiring voice control or interaction, like smart homes, toys, lamps, and robot projects. Self-Learning Function This voice recognition module is equipped with a self-learning feature, supporting the addition of 17 custom command words. It offers the flexibility to train any sound as a command, such as a whistle, a snap, or even a cat's meow, greatly enhancing the versatility of interactive audio projects. User-Friendly The offline speech recognition sensor boasts a user-friendly design. It comes with 121 built-in fixed command words, eliminating the need for users to record their own voices. Real-Time Voice Feedback The module is equipped with an integrated speaker and an interface for an external speaker, enabling it to deliver real-time vocal feedback on recognition outcomes.The module is equipped with an integrated speaker and an interface for an external speaker, enabling it to deliver real-time vocal feedback on recognition outcomes. High Compatibility Support I2C and UART, with a Gravity interface Compatible with 3.3V/5V Specification Operating Voltage: 3.3 - 5V Maximum Operating Current:≤370 mA (5V) Communication: I2C/UART I2C Address: 0x64 Fixed Command: 121 Fixed Wake-up Command: 1 Custom Command: 17 Learning Activation Command: 1 Onboard Microphone Sensitivity: -28db Module Size: 49×32 mm/1.93×1.26”

Review: Works well and easy to use.
Review: Very good, needs occasional reboot

## Features

- 【Easy to Use】: this voice recognition sensor is compatible with micro:bit, Arduino Uno and ESP32. It can be programmed using MakeCode and supports plug-and-play functionality. At the same time, this voice recognition sensor also support I2C and UART communication methods, with a Gravity interface.
- 【121 built-in fixed command words】: The offline voice recognition sensor comes with 121 built-in fixed command words, eliminating the need for users to record their own voices. For instance, in an intelligent window system, when it starts to rain or thunder, there's no need for manual window operation. The offline voice recognition module can recognize the pre-set command word "close the window," triggering the automatic closing of the window to cope with sudden weather changes.
- 【Self-Learning Function+Adding 17 Custom Command Words】: This voice recognition module is equipped with a self-learning function and supports the addition of 17 custom command words. Any sound could be trained as a command, such as whistling, snapping, or even cat meows, which brings great flexibility to interactive audio projects. For instance automatic pet feeder. When a cat emits a meow, the offline voice recognition module can recognize the meow and trigger the feeder to automatically provide food for the cat.
- 【No network required】: This voice recognition sensor can be used without the need for a network connection, making it suitable for various settings. It provides fast response to specific command words and instructions. Moreover, the onboard MCU is equipped with voice recognition algorithms, ensuring that conversations are not recorded or uploaded to the cloud, thus ensuring greater privacy and security.
- 【Integrated Microphone and Speaker with Compact Size】: built-in speaker and external speaker interface for real-time voice feedback of recognition results. Compact size of only 49×32 mm, convenient for embedding in applications.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C5XG3BXW |
| Box Contents | Built-in speaker and interface for external speaker |
| Brand | DFROBOT |
| Brand Name | DFROBOT |
| CPU Manufacturer | Multiple |
| CPU Model | Unknown |
| Compatible Devices | micro:bit, Arduino, ESP32 |
| Connectivity Technology | I2C |
| Country of Origin | USA |
| Customer Reviews | 4.2 out of 5 stars 86 Reviews |
| Included Components | Built-in speaker and interface for external speaker |
| Item Dimensions L x W x H | 49L x 32W x 32H Millimeters |
| Manufacturer | DFROBOT |
| Model Name | AI Offline Language Learning Voice and Speech Recognition Module |
| Network Connectivity Technology | I2C |
| Processor Brand | Multiple |
| Processor Count | 1 |
| RAM Memory Technology | DDR4 |
| Wireless Compability | Bluetooth |

## Product Details

- **Brand:** DFROBOT
- **Model Name:** AI Offline Language Learning Voice and Speech Recognition Module
- **CPU Model:** Unknown
- **Connectivity Technology:** I2C
- **Included Components:** Built-in speaker and interface for external speaker

## Images

![Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART - Image 1](https://m.media-amazon.com/images/I/61hi4u0rOEL.jpg)
![Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART - Image 2](https://m.media-amazon.com/images/I/61vS31cv6LL.jpg)
![Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART - Image 3](https://m.media-amazon.com/images/I/61zDC8HS-XL.jpg)
![Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART - Image 4](https://m.media-amazon.com/images/I/712HdcAoXKL.jpg)
![Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART - Image 5](https://m.media-amazon.com/images/I/71SE5MdpG5L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well and easy to use.
*by M***E on 15 March 2025*



### ⭐⭐⭐⭐⭐ Very good, needs occasional reboot
*by R***E on 1 February 2025*



### ⭐⭐⭐⭐⭐ Gute "Nuschelbox" für kleines Geld, mit Potential
*by B***E on 19 September 2025*

Schönes Ding ich nenne es die "Nuschelbox" schade das man nicht alle Befehle ändern kann, aber dafür kann man ja ein paar eigene Befehle mit eigener Sprache festlegen und wenn man dann auch ungefähr die Betonung wieder trifft klappt es auch ganz gut mit der Sprachsteuerung. Auch die erkennungsreichweite finde ich beeindruckend (man muss nicht direkt davor kleben). Für ein IVR System würde ich sagen unbrauchbar aber als alternative zu gängigen Sprachgesteuerten Online Smarthome lösungen definitiv eine gute wahl dadurch das kein Internet benötigt wird.

## Frequently Bought Together

- Gravity: Offline Language Learning Voice Recognition Sensor for micro:bit/Arduino / ESP32 - I2C & UART
- WWZMDiB Voice Recognition Module V3 .1 Compatible with Arduino Elechouse Supports up to 80 Voice Commands
- Arduino Uno REV3 [A000066] – ATmega328P Microcontroller, 16MHz, 14 Digital I/O Pins, 6 Analog Inputs, 32KB Flash, USB Connectivity, Compatible with Arduino IDE for DIY Projects and Prototyping

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-21*