Description:
The Offline Speech Recognition Module is an efficient solution ideal for human-computer interaction, machine learning, voice assistants, and smart home voice control projects. It is easy to use and compatible with Arduino, micro:bit, and ESP32, with detailed tutorials provided. It offers plug-and-play functionality through I2C and UART. The module features 121 built-in command words commonly used in education and smart home settings and supports 17 customized commands (e.g., recording a cat's meow for an automatic feeder). The module is highly integrated, including an onboard speaker and microphone, providing real-time voice feedback.
Version History & Important Information
Note: DFRobot warehouses stock both V1.0 and V1.1 of this module. You may receive either version. Rest assured, both versions deliver the same core speech recognition functionality, performance, and key features outlined in this product description.
V1.1 (May 8, 2025):
This version includes minor iterative refinements focused on physical handling and assembly convenience:
- Improved Speaker Connection: The onboard speaker connection is an easier plug-and-play connector (V1.0 has a soldered connection). This simplifies assembly and modification.
- Enhanced Sensor Mounting: Mounting holes have been added to the sensor board for more secure attachment.
V1.0 (March 2023):
The original robust and fully capable module. It provides the complete suite of offline speech recognition features and offers a highly effective and reliable user experience.
Version Update of Gravity: Offline Language Learning Voice Recognition Sensor
Features:
- User-Friendly: Plug and play, compatible with Arduino UNO, micro:bit, and ESP32.
- 121 Pre-Programmed Commands: Ready for immediate use without any setup.
- Self-Learning Capability: Supports the addition of 17 customized command words.
- Offline Operation, Enhanced Privacy: No network required.
- High Integration: Includes an onboard speaker and microphone.
- Instant Voice Feedback: Provides real-time recognition results.
Applications:
- Voice recognition interaction
- Voice-controlled terminal
- Competition and project development
Specifications:
- 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”
Part List:
- Gravity: Voice Recognition Module - I2C & UART x1
- Gravity-4P I2C/UART Sensor Connector x1
