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ESP32 with Gravity Voice Recognition Module

02-07-2025

The Gravity Voice Recognition Module is a user-friendly module developed by DFRobot that allows microcontrollers like Arduino or ESP32 to recognize voice commands offline (without internet access). It's ideal for voice-controlled smart devices, robots, automation systems, and other embedded applications.

🔧 Key Features:

Feature	Details
Offline Voice Recognition	No internet or cloud processing required.
Custom Command Training	Can be trained with up to 80 custom commands (user-defined).
Predefined Wake Word	Comes with built-in wake words (like “Hello Robot”).
Speaker-Independent	Works for most users without personalized training.
Communication Interface	Supports both UART and I2C for communication.
Language Support	English and Mandarin (depending on firmware version).
Compact Design	Small PCB module suitable for embedding in electronics projects.

🧠 How It Works:

Wake-Up Mode: Waits for a predefined wake word (like "Hello Robot").
Command Recognition: Once awake, it listens for the next spoken command and returns a corresponding ID.
Command Mapping: The microcontroller receives this ID and triggers actions like turning on lights, moving motors, etc.

📡 Communication Interfaces:

UART (Serial Communication):
- Default Baud rate: 115200
- Commands are sent/received as bytes or ASCII strings.
I2C (For simultaneous multi-module control):
- Default address: 0x64
- Easy integration with other I2C devices like OLED, sensors, etc.

🔌 Typical Connections with Arduino/ESP32:

Module Pin	Arduino Pin
VCC	5V / 3.3V
GND	GND
RX	D2 (SoftSerial TX)
TX	D3 (SoftSerial RX)

🧪 Voice Command Training:

Use the DFRobot voice training software or serial commands to:
- Add/Delete commands
- Set wake-up time
- View recognized command IDs

Example command (in serial):

📁 Example Output:

When a command is recognized, the module sends:

Where 01 is the command ID previously trained and mapped.

💡 Applications:

Smart Home Control
Voice-controlled Robots
Assistive Technologies
Touchless Switches
DIY AI Projects

HOW TO OPERATE

#include "DFRobot_DF2301Q.h"

#define Led 2

//I2C communication

DFRobot_DF2301Q_I2C asr;

void setup() {

Serial.begin(115200);

pinMode(Led, OUTPUT); //Init LED pin to output mode

digitalWrite(Led, LOW); //Set LED pin to low

// Init the sensor

while (!(asr.begin())) {

Serial.println("Communication with device failed, please check connection");

delay(3000);

}

Serial.println("Begin ok!");

/**

* @brief Set voice volume

* @param voc - Volume value(1~7)

*/

// asr.setVolume(4);

/**

@brief Set mute mode

@param mode - Mute mode; set value 1: mute, 0: unmute

*/

asr.setMuteMode(0);

/**

@brief Set wake-up duration

@param wakeTime - Wake-up duration (0-255)

*/

asr.setWakeTime(20);

/**

@brief Get wake-up duration

@return The currently-set wake-up period

*/

uint8_t wakeTime = 0;

wakeTime = asr.getWakeTime();

Serial.print("wakeTime = ");

Serial.println(wakeTime);

// asr.playByCMDID(1); // Wake-up command

/**

@brief Play the corresponding reply audio according to the ID

@param CMDID - command word ID

*/

//asr.playByCMDID(23); // Command word ID

}

void loop() {

/**

@brief Get the ID corresponding to the command word

@return Return the obtained command word ID, returning 0 means no valid ID is obtained

*/

uint8_t CMDID = asr.getCMDID();

switch (CMDID) {

    case 103:                                                  //If the command is “Turn on the light”

digitalWrite(Led, HIGH); //Turn on the LED

      Serial.println("received'Turn on the light',command flag'103'");  //Serial transmits "received"Turn on the light",command flag"103

break;

    case 104:                                                  //If the command is “Turn off the light”

digitalWrite(Led, LOW); //Turn off the LED

      Serial.println("received'Turn off the light',command flag'104'");  //The serial transmits "received"Turn off the light",command flag"104""

break;

default:

if (CMDID != 0) {

Serial.print("CMDID = "); //Printing command ID

Serial.println(CMDID);

}

delay(300);

}

ESP32 with Gravity Voice Recognition Module

ESP32 with Gravity Voice Recognition Module

🔧 Key Features:

🧠 How It Works:

📡 Communication Interfaces:

🔌 Typical Connections with Arduino/ESP32:

🧪 Voice Command Training:

📁 Example Output:

💡 Applications:

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Blog Details

ESP32 with Gravity Voice Recognition Module

🔧 Key Features:

🧠 How It Works:

📡 Communication Interfaces:

🔌 Typical Connections with Arduino/ESP32:

🧪 Voice Command Training:

📁 Example Output:

💡 Applications:

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