How to Use EasyVR plus 3: Examples, Pinouts, and Specs

The EasyVR Plus 3, manufactured by Fortebit, is a versatile voice recognition module designed for creating interactive, voice-controlled applications. It features a built-in microphone and supports multiple languages, making it ideal for a wide range of projects. This module allows users to control devices through voice commands, offering a hands-free and intuitive interface for automation, robotics, and other embedded systems.

• Home automation systems (e.g., controlling lights, appliances, or security systems)
• Robotics (e.g., voice-controlled robots or drones)
• Assistive technologies for accessibility
• Interactive kiosks and displays
• Automotive voice control systems
• Gaming and entertainment systems

The EasyVR Plus 3 is a compact and powerful module with the following key specifications:

The EasyVR Plus 3 module has a set of pins for interfacing with microcontrollers and other devices. Below is the pin configuration:

1. Power the Module: Connect the VCC pin to a 3.3V or 5.0V power source and the GND pin to ground.
2. Connect to a Microcontroller: Use the TX and RX pins to establish UART communication with a microcontroller (e.g., Arduino UNO).
3. Microphone and Speaker: Use the built-in microphone for voice input or connect an external microphone to the MIC pin. Optionally, connect a speaker to the SPK pin for audio feedback.
4. Load Voice Commands: Use the EasyVR Commander software to define and upload voice commands to the module.
5. Integrate into Your Application: Write code on your microcontroller to process voice commands and trigger desired actions.

• Ensure the module is powered within the specified voltage range to avoid damage.
• Place the module in a location with minimal background noise for optimal voice recognition performance.
• Use a level shifter if interfacing with a 3.3V microcontroller to ensure proper UART communication.
• Regularly test and calibrate voice commands to improve recognition accuracy.

Below is an example Arduino sketch to interface with the EasyVR Plus 3 and process voice commands:

#include <EasyVR.h> // Include the EasyVR library

// Define the pins for UART communication
#define RX_PIN 2 // Connect to TX pin of EasyVR Plus 3
#define TX_PIN 3 // Connect to RX pin of EasyVR Plus 3

// Create an EasyVR object
EasyVR easyvr(RX_PIN, TX_PIN);

void setup() {
  Serial.begin(9600); // Initialize serial communication for debugging
  easyvr.begin(9600); // Initialize EasyVR communication

  // Check if the EasyVR module is connected
  if (!easyvr.detect()) {
    Serial.println("EasyVR not detected! Check connections.");
    while (true); // Halt execution if the module is not detected
  }

  Serial.println("EasyVR detected and ready!");
}

void loop() {
  // Check if a voice command is received
  if (easyvr.hasFinished()) {
    int command = easyvr.getCommand(); // Get the recognized command

    switch (command) {
      case 0: // Command 0 (e.g., "Turn on light")
        Serial.println("Command 0 recognized: Turn on light");
        // Add code to turn on a light or perform an action
        break;

      case 1: // Command 1 (e.g., "Turn off light")
        Serial.println("Command 1 recognized: Turn off light");
        // Add code to turn off a light or perform an action
        break;

      default:
        Serial.println("Unknown command received.");
        break;
    }
  }
}

• Install the EasyVR Arduino library from the Arduino IDE Library Manager before uploading the code.
• Ensure the RX and TX pins are correctly connected to the Arduino UNO.

1. EasyVR Not Detected

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Double-check the connections, ensure the module is powered correctly, and verify the RX/TX pin connections.

2. Voice Commands Not Recognized

   • Cause: Background noise or unclear pronunciation.
   • Solution: Reduce background noise, speak clearly, and retrain the voice commands if necessary.

3. No Audio Output

   • Cause: Speaker not connected or volume too low.
   • Solution: Verify the speaker connection and adjust the volume settings in the EasyVR Commander software.

4. UART Communication Issues

   • Cause: Mismatched baud rate or incorrect wiring.
   • Solution: Ensure the baud rate in the code matches the module's settings and check the RX/TX connections.

Q: Can I use the EasyVR Plus 3 with a Raspberry Pi?
A: Yes, the EasyVR Plus 3 can be used with a Raspberry Pi via UART communication. Ensure proper voltage level shifting if required.

Q: How many voice commands can the module store?
A: The module can store up to 32 user-defined voice commands per group, with multiple groups supported.

Q: Does the module support speaker-independent recognition?
A: Yes, the EasyVR Plus 3 supports both speaker-dependent and speaker-independent recognition modes.

Q: Can I use an external microphone with the module?
A: Yes, the module supports an external microphone via the MIC pin for improved voice input quality.