Arduino Voice Controlled Robot

Voice Controlled Robot

1. Connections for HC-05 Bluetooth module:-

Image result for arduino bluetooth robot

Arduino HC-05 Bluetooth Module

3.3V Vcc

Gnd Gnd

Tx Rx

Rx Tx

2. Connections for L293D module:-

Here in L293d motor driver at the top we have total 7 pins . 4 Pins are used for controlling the motor and 3 pins in the middle of the l293d module are used for powering the module.

Connect the arduino and L293d as follows:-

Arduino Pins:- L293d Motor Driver

Pin 13 M1 a // for controlling motor 1

Pin 12 M1 b

Pin 11 M2 a // for controlling motor 2

Pin 10 M2 b

Vin 12v

Gnd Gnd // providing power to L293d module

5v 5v

2. Code for Voice Controlled Robot :-

String voice;

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);

pinMode(12, OUTPUT);

pinMode(11, OUTPUT);

pinMode(10, OUTPUT);

}

void loop() 
  {
    while (Serial.available())
    { 
     delay(10); //Delay added to make thing stable
      char c = Serial.read(); //Conduct a serial read
       if (c == '#') 
       {
         break;
       } 
       //Exit the loop when the # is detected after the word
      voice += c; //Shorthand for voice = voice + c
    } 
    if (voice.length() > 0)
    {
    Serial.println(voice);

if(voice == "*forward")

{
        digitalWrite(13,HIGH); 
        digitalWrite(12,LOW);  
        digitalWrite(11,HIGH);  
        digitalWrite(10,LOW); //code for foward move
     }

else if(voice == "*backward")
   {
        digitalWrite(13,LOW);

digitalWrite(12,HIGH);

digitalWrite(11,LOW);  
     digitalWrite(10,HIGH); //code for backward move
   }

else if(voice == "*left")
   {

digitalWrite(13,HIGH);

digitalWrite(12,HIGH);

digitalWrite(11,HIGH);  
        digitalWrite(10,LOW);        //code for left move
   }

else if(voice == "*right")
   {
   
        digitalWrite(13,HIGH);

digitalWrite(12,LOW);

digitalWrite(11,HIGH);  
        digitalWrite(10,HIGH);     //code for right move
   }

else if(voice == "*stop")
   {

digitalWrite(13,HIGH);

digitalWrite(12,HIGH);

digitalWrite(11,HIGH);  
        digitalWrite(10,HIGH);
   //code for stopping robot
   } 
voice="";                         
//Reset the variable after initiating
}
}

Upload the above code to the arduino.

3. Android app for Voice Controlled Robot :-

Download the following android app and install it using your playstore or web browser.

https://play.google.com/store/apps/details?id=robotspace.simplelabs.amr_voice&hl=en

follow the below steps :-

BT Voice Control for Arduino- screenshot

Connect the HC-05 Module displayed in the list after you click the connect robot.

Once the bluetooth is paired , click the mic icon on the app after that a message box like tap to speak will appear and send the command using your voice one by one as foward , backward ,left and right and stop to stop the robot just by tapping the icon on the app.

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