Offline Voice Recognition Sensor for micro:bit, Arduino, ESP32 - I2C & UART
π€ Gravity: Offline Voice Recognition Sensor
π§© Overview
Offline voice recognition module (no internet needed)
Compatible with micro:bit, Arduino, and ESP32
Supports both I2C and UART interfaces
Ideal for voice-controlled DIY projects
βοΈ Working Principle
Microphone captures voice input
Onboard processor analyzes and matches commands
Outputs digital signal or serial data to microcontroller
Works entirely offline, no cloud or internet required
π Key Specifications
πΉ Voltage: 3.3V β 5V DC
πΉ Current: ~20β40 mA
πΉ Recognition Mode: Offline, supports multiple custom commands
πΉ Interfaces: UART / I2C / GPIO
πΉ Number of Commands: 7β80 (depends on module and training)
πΉ Response Time: ~200ms (fast recognition)
πΉ Signal Output: High/Low digital pin or serial communication
π§± Module Components
MEMS microphone
DSP / Voice recognition chip
UART/I2C communication ports
Control & status LEDs
π Features
Works offline β no internet needed
Customizable commands (trainable)
Low power, compact design
Supports multi-platform development
π οΈ Applications
Voice-controlled robots π€
Smart home devices π
IoT voice-enabled projects π
Hands-free automation
Educational STEM experiments
β οΈ Usage Tips
Use clean, noise-free environment for best accuracy
Ensure proper power supply (stable 3.3Vβ5V)
Train module for custom voice commands
Use short, distinct command words
β Advantages
Offline operation β no privacy concerns
Fast response (~200ms)
Easy integration with Arduino, micro:bit, ESP32
I2C & UART support β flexible connectivity
β οΈ Limitations
Recognition depends on voice clarity
Limited number of simultaneous commands
Background noise can affect accuracy
