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Introduction 

In this tutorial you will learn how to use a voice recognition - serial - module with the Arduino uno board. This module can store up to 15 voice commands. Those are divided into 3 groups, with 5 commands in each group. First we should train the module with voice instructions group by group. After that, we should import one group before it could recognize the 5 voice instructions within that group. 
If we need to implement instructions in other groups, we should import the group first. 

In this tutorial we will use an RGB LED and we will try to change the color of it with voice commands.

What you will need - Hardware

For this tutorial you will need:

Recording

The first thing that we have to do is to record voice instructions/commands. Each voice instruction has the maximum length of 1300ms (1.3sec), which ensures that most words can be recorded. Once you start recording, you can’t stop the recording process until you finish all the 5 voice instructions/commands of one group. Also, once you start recording, the previous content of that group will be erased. 

Download and extract AccessPort from here. This tool will allow us to send HEX commands to the voice recognition module.
​
Connection between Arduino* and module for recording procedure:
  • Module Vcc to Arduino 5V
  • Module GND to Arduino GND
  • Module RX to Arduino RX
  • Module TX to Arduino TX
*You must remove ATmega328p from board or program it with blink example. If you want you can also use one usb to serial board to complete this procedure. 

Available commands:
  • Delete Group 1 - send hex AA 01
  • Delete Group 2 - send hex AA 02
  • Delete Group 3 - send hex AA 03
  • Delete All Groups - send hex AA 04
  • Record Group 1 - send hex AA 11
  • Record Group 2 - send hex AA 12
  • Record Group 3 - send hex AA 13
  • Import Group 1 - send hex AA 21
  • Import Group 2 - send hex AA 22
  • Import Group 3 - send hex AA 23
  • Query the recorded group - send hex AA 24
Let's get started with our voice commands!
Picture
click to re size
We will record the group 1 with 5 commands: White, Red, Blue, Green and OFF. Open AccessPort app and begin the serial communication at 9600 bps. (click on image). Now click on hex and type AA 11 and click the send button. This will start the recording procedure for the first group.
In this step, time is the key... You will be asked to record each command (white, red etc) three times.
If you having troubles with this, try to read this manual. When recording is completed type and send AA 21.
Disconnect the voice recognition module from the Arduino uno board and proceed to next step. 

The Circuit
The connections are pretty easy, see the above image with the breadboard circuit schematic.

Note: Module RX - Arduino TX and Module TX - Arduino RX

The code

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int redPin = 9; // R petal on RGB LED module connected to digital pin 11
int greenPin = 10; // G petal on RGB LED module connected to digital pin 9
int bluePin = 11; // B petal on RGB LED module connected to digital pin 10
byte com = 0; //reply from voice recognition

void setup()
{
  Serial.begin(9600);
  pinMode(redPin, OUTPUT); // sets the redPin to be an output
  pinMode(greenPin, OUTPUT); // sets the greenPin to be an output
  pinMode(bluePin, OUTPUT); // sets the bluePin to be an output
  delay(2000);
  Serial.write(0xAA);
  Serial.write(0x37);
  delay(1000);
  Serial.write(0xAA);
  Serial.write(0x21);
  color(255,255,255); // turn RGB LED on -- white
  delay(5000);
}

void loop() // run over and over again
{
  while(Serial.available()){
    com = Serial.read();
    switch(com){
      case 0x11:
        color(255,255,255); // turn RGB LED on -- white
        break;
      case 0x12:
        color(255, 0, 0); // turn the RGB LED red
      break;
      case 0x13:
        color(0,255, 0); // turn the RGB LED green
      break;
      case 0x14:
        color(0, 0, 255); // turn the RGB LED blue
      break;
      case 0x15:
        color(0,0,0); // turn the RGB LED off
      break;
   }
  }
}

void color (unsigned char red, unsigned char green, unsigned char blue) // the color generating function
{
  analogWrite(redPin, red*102/255);
  analogWrite(bluePin, blue*173/255);
  analogWrite(greenPin, green*173/255);
}
Download the code from here and open it with Arduino IDE. ​
voicerecognition_tutorial.zip
File Size: 0 kb
File Type: zip
Download File

Well done!

You have successfully completed one more "How to" tutorial and you learned how to use the voice recognition module. What next? Try to add more voice commands!

I hope you liked this, let me know in the comments.

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