Build a Voice‑Controlled Arduino Car with BLE – DIY Guide

About this project

Components:

• Arduino Uno

• Breadboard

• Motors x2

• Wheels x2

• Chassis (of appropriate size)

• Voltage Regulator LM7805

• L293D

• 12V battery (power source)

• Jumper wires

• Bluetooth Module HC-05

You can find the app here: https://play.google.com/store/apps/details?id=appinventor.ai_cempehlivan92.Arduino_Sesli_Kontrol

Idea:

We connect the Bluetooth module with the mobile app. Once done, the commands which we give through the mobile get sent to the Arduino via the module. We accept character by character from the serial buffer sent by the app and combine them to form a string.

We then compare it to the command. If it matches, the command is carried out. For example, when the string we receive is "Right", the bot turns right.

Connections:

Find all connections here :https://yainnoware.blogspot.com/p/voice-controlled-car.html

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);
    }
    }