--- product_id: 544697651 title: "Gravity: Offline Language Learning Voice Recognition Sensor for Arduino/Raspberry Pi/Python / ESP32 - I2C & UART" brand: "dfrobot" price: "C$2395" currency: NIO in_stock: true reviews_count: 5 category: "Dfrobot" url: https://www.desertcart.ni/products/544697651-gravity-offline-language-learning-voice-recognition-sensor-for-arduino-raspberry store_origin: NI region: Nicaragua --- # Built-in + external speaker feedback I2C & UART multi-protocol support 121 built-in + 17 custom commands Gravity: Offline Language Learning Voice Recognition Sensor for Arduino/Raspberry Pi/Python / ESP32 - I2C & UART **Brand:** dfrobot **Price:** C$2395 **Availability:** ✅ In Stock ## Summary > 🎤 Own your voice-controlled projects—offline, instant, unstoppable. ## Quick Answers - **What is this?** Gravity: Offline Language Learning Voice Recognition Sensor for Arduino/Raspberry Pi/Python / ESP32 - I2C & UART by dfrobot - **How much does it cost?** C$2395 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/544697651-gravity-offline-language-learning-voice-recognition-sensor-for-arduino-raspberry) ## 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 - • **Offline Voice Mastery:** 121 fixed commands + 17 custom triggers for zero-latency control—no WiFi needed. - • **Instant Vocal Feedback:** Built-in speaker and external interface deliver real-time voice responses for intuitive interaction. - • **Plug & Play Versatility:** Seamlessly integrates with Arduino, Raspberry Pi, ESP32 via I2C/UART at 3.3V/5V. - • **Noise-Resistant Dual Mics:** Dual microphone design ensures crystal-clear recognition even in noisy environments. - • **Compact Creative Powerhouse:** Small 49x32mm footprint perfect for embedding in smart homes, robotics, and interactive toys. ## Overview The DFROBOT Gravity Offline Voice Recognition Sensor is a compact, versatile module featuring 121 built-in voice commands plus 17 customizable ones, operating entirely offline. Compatible with popular platforms like Arduino, Raspberry Pi, and ESP32 via I2C and UART, it boasts a dual-microphone design for superior noise resistance and real-time voice feedback through built-in and external speakers. Ideal for smart home automation, robotics, and interactive devices, it empowers developers to create responsive voice-controlled projects without internet dependency. ## 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. - It's been while since I bought this and had a quick play with it, but now it's been integrated into an actual project I'm happy to review it as being very good - I've found it recognises phrases easily. It maybe could do with having more customisable phrases as a lot of the pre-programmed ones are quite specific and won't be used, but for the price it's pretty good. Review: Very good, needs occasional reboot - Works surprisingly well. I'm using it with an ESP32. I was particularly impressed with the fact that I can record a command with my male voice and the device will recognize that same command from my wife's voice. I do wish it had an external microphone connector instead of an external speaker connector. Like others have said, it does seem to stop responding to the wake command about an hour after booting up. It's easy enough to just have the ESP32 reboot it periodically but it would be better to just not. All in all, if you're making a robot and considering this, buy it, you won't regert it. ## Features - Offline Voice Recognition: Enjoy quick response with this module's offline voice recognition, featuring 121 built-in fixed command words and 17 customizable commands, no internet connection required. - Versatile Compatibility: Easily integrate this module into your projects with its support for I2C and UART communication methods, compatibility with 3.3V/5V controllers, and various platforms like Arduino, Raspberry Pi, and ESP32. - Real-time Voice Feedback: Stay informed with the built-in speaker and external speaker interface that provide immediate voice feedback on recognition results, enhancing user experience and interaction. - Dual Microphone Design: Experience enhanced noise resistance and longer recognition distance with the module's dual microphone setup, ensuring reliable voice recognition even in noisy environments. - Creative Applications: Unleash your creativity in voice-controlled projects, including smart home appliances, toys, lamps, and robotics, with this compact module sized at 49x32mm, perfect for embedding in various applications. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C5XG3BXW | | Best Sellers Rank | #5,554 in Computers ( See Top 100 in Computers ) #41 in Single-Board Computers | | Brand | DFROBOT | | Built-In Media | Built-in speaker and interface for external speaker | | CPU Model | Core i7 | | CPU model | Core i7 | | Compatible Devices | Arduino, Raspberry Pi | | Connectivity Technology | I2C | | Connectivity technology | I2C | | Customer Reviews | 4.1 out of 5 stars 93 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 | | Mfr Part Number | SEN0539-EN | | Model Name | Gravity | | Model Number | SEN0539-EN | | Model name | Gravity | | Operating System | Linux | | Operating system | Linux | | Processor Brand | Intel | | Processor Count | 1 | | RAM Memory Technology | LPDDR3 | | Smart Home Compatibility | Smart Home Compatible | | Wireless Compability | Bluetooth | ## Product Details - **Brand:** DFROBOT - **CPU model:** Core i7 - **Connectivity technology:** I2C - **Included components:** Built-in speaker and interface for external speaker - **Model name:** Gravity ## Images ![Gravity: Offline Language Learning Voice Recognition Sensor for Arduino/Raspberry Pi/Python / ESP32 - I2C & UART - Image 1](https://m.media-amazon.com/images/I/61hi4u0rOEL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well and easy to use. *by M***E on 15 March 2025* It's been while since I bought this and had a quick play with it, but now it's been integrated into an actual project I'm happy to review it as being very good - I've found it recognises phrases easily. It maybe could do with having more customisable phrases as a lot of the pre-programmed ones are quite specific and won't be used, but for the price it's pretty good. ### ⭐⭐⭐⭐⭐ Very good, needs occasional reboot *by R***E on 1 February 2025* Works surprisingly well. I'm using it with an ESP32. I was particularly impressed with the fact that I can record a command with my male voice and the device will recognize that same command from my wife's voice. I do wish it had an external microphone connector instead of an external speaker connector. Like others have said, it does seem to stop responding to the wake command about an hour after booting up. It's easy enough to just have the ESP32 reboot it periodically but it would be better to just not. All in all, if you're making a robot and considering this, buy it, you won't regert it. ### ⭐⭐⭐⭐⭐ 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ni/products/544697651-gravity-offline-language-learning-voice-recognition-sensor-for-arduino-raspberry](https://www.desertcart.ni/products/544697651-gravity-offline-language-learning-voice-recognition-sensor-for-arduino-raspberry) --- *Product available on Desertcart Nicaragua* *Store origin: NI* *Last updated: 2026-07-08*