DFRobot Gravity Offline Voice Recognition Sensor for micro:bit Arduino ESP32

Overview

Bring hands-free control to your next build with the DFRobot Gravity Offline Language Learning Voice Recognition Sensor. Designed for makers, students and educators working with micro:bit, Arduino Uno or ESP32, this compact module listens for spoken commands and reacts instantly, all without an internet connection or cloud service.

Because recognition happens on the onboard MCU, your voice data is never recorded or uploaded, giving you fast response times and stronger privacy for interactive projects. The integrated microphone and speaker keep wiring simple, so you can focus on building clever voice-driven applications rather than debugging a tangle of components.

Key FeaturesBrandDFRobotModelSEN0539-EN (AI Offline Language Learning Voice and Speech Recognition Module)Compatible Devicesmicro:bit, Arduino Uno, ESP32ConnectivityI2C and UART communicationWireless CompatibilityBluetoothBuilt-in Commands121 fixed command words ready to use out of the boxCustom CommandsSelf-learning function supports adding up to 17 custom command wordsAudioOnboard microphone and built-in speaker with interface for an external speakerHighlights

• ✓Works fully offline, so projects respond quickly without any network dependency
• ✓121 built-in command words let you start testing immediately, no configuration needed
• ✓Teach it your own sounds, from whistles and snaps to custom phrases, for truly personal interactions
• ✓Onboard MCU keeps conversations private: nothing is recorded or sent to the cloud
• ✓Compact, highly integrated design saves space and reduces complex wiring

Usage

Ideal for smart home prototypes, voice-activated windows or lighting, interactive exhibits and educational workshops. The self-learning mode opens the door to playful ideas such as sound-triggered pet feeders or audio-reactive robots. Detailed Arduino IDE and MakeCode tutorials are available online to help beginners get started quickly.

Available in multiple size and pack options: please select your preferred configuration from the drop-down menu.

In the Box

• ›Gravity Offline Voice Recognition Sensor module
• ›Connection cable as supplied by the manufacturer