Voice Controlled Car

A robot which can be controlled using specific voice commands. Speech to Text functionality is used to convert voice commands to text which are then sent to Arduino through Bluetooth communication.

Voice commands have become a primary way to interact with devices after the development of devices like Alexa and Google Home. Through this project, control of the robots becomes handy.

The voice commands are perceived using an android application which converts speech to text. This text is in the form of a string. It is then sent to Arduino via the Bluetooth module. We accept character by character from the serial buffer sent by the app and combine them to form a string. Then the code compares it to the command. If it matches, the command is carried out. For example, if the string we received is "right", the bot turns right.

Components :

• Arduino Uno
• L293D(Motor Driver)
• Motors x 2
• LM 7805 Voltage Regulator
• IR Sensors x 2
• Bread Board
• Chassis(of appropriate size)
• Jumper Wires
• Battery (Power Source)
• Bluetooth Module HC-05

You can find the app here

Connections :

The motor connections are here

Bluetooth module connections:

Code:

  
int motor_input1=11;
int motor_input2=10;
int motor_input3=5;
int motor_input4=6;
String voice;
void setup() 
{
  Serial.begin(9600);
  pinMode(motor_input1, OUTPUT);   //RIGHT MOTOR
  pinMode(motor_input2, OUTPUT);   //RIGHT MOTOR
  pinMode(motor_input3, OUTPUT);   //LEFT MOTOR
  pinMode(motor_input4, OUTPUT);   //LEFT MOTOR
}
void loop() 
{  
  while(Serial.available()>0)
  {
    delay(10);
    char c=Serial.read();
    if(c=='#')
    {
      break;
    }
    voice+=c;
    }
   if(voice=="forward"){
    digitalWrite(motor_input1, LOW);
    digitalWrite(motor_input2, HIGH);
    digitalWrite(motor_input3, LOW);
    digitalWrite(motor_input4, HIGH);
     delay(5000);
    }
  else
    if(voice=="back"){
    digitalWrite(motor_input1, HIGH);
    digitalWrite(motor_input2, LOW);
    digitalWrite(motor_input3, HIGH);
    digitalWrite(motor_input4, LOW);  
    delay(5000);}
  else
   if(voice=="left"){
    digitalWrite(motor_input1, LOW);
    digitalWrite(motor_input2, HIGH);
    digitalWrite(motor_input3, HIGH);
    digitalWrite(motor_input4, LOW);
    delay(800); 
    }
  else
   if(voice=="right"){
    digitalWrite(motor_input1, HIGH);
    digitalWrite(motor_input2, LOW);
    digitalWrite(motor_input3, LOW);
    digitalWrite(motor_input4, HIGH);
    delay(800);   }
   if(voice.length()>0)
    {
      Serial.println(voice);
       voice="";
    digitalWrite(motor_input1, LOW);
    digitalWrite(motor_input2, LOW);
    digitalWrite(motor_input3, LOW);
    digitalWrite(motor_input4, LOW);
    }
   }