Description Description About Gravity Offline Voice Recognition Sensor Take your voice-controlled projects to the next level — without ever needing an internet connection. The DFRobot Gravity Offline Voice Recognition Sensor is a smart, flexible module designed for makers who want real-time, offline voice interaction for their DIY electronics. Whether you’re building a robot, smart lamp, or interactive toy, this module makes voice control simple. It comes pre-loaded with 121 useful command words right out of the box, and lets you add up to 17 custom commands of your own. The best part? You can train it to respond to practically any sound — a whistle, a snap, or even your cat’s meow. Built for real-world use, the module features dual microphones for improved noise resistance and longer-range recognition. A built-in speaker (plus the option to connect an external one) means your project can give audio feedback instantly. It supports both I2C and UART connections and plays nice with popular boards like Arduino, Raspberry Pi, ESP32, and more — whether you’re working with 3.3V or 5V systems. Features Offline & Real-Time: No internet required. Works anywhere, anytime. Highly Flexible: Train any sound as a command — not just words. Dual Mic Design: Clear voice capture even in noisy environments. Built-In Audio Feedback: Responds with real-time voice prompts. Easy Integration: Gravity interface and support for I2C/UART. Cross-Compatible: Works with Arduino, Raspberry Pi, ESP32, micro:bit, and FireBeetle. Specifications: Specification Detail Operating Voltage 3.3 – 5V Maximum Operating Current ≤370 mA (5V) Communication I2C/UART I2C Address 0x64 Fixed Commands 121 Fixed Wake-up Command 1 Custom Commands 17 Learning Activation Command 1 Onboard Microphone Sensitivity -28dB Module Size 49×32 mm / 1.93×1.26” Operating Temperature 0-70℃ Applications Voice-controlled smart home projects Educational & STEM kits DIY robots and interactive gadgets Hands-free control systems What’s in the Box? 1 × DFRobot Gravity: Offline Voice Recognition Sensor 1 × Gravity 4-Pin I2C/UART Cable
