Mobile Controlled Car Using Arduino+Bluetooth Module

Hello friends,

In this project i will show you how to make a android phone controlled car using Bluetooth module and Arduino Uno Board.

In this i also show you how to make android app for the same so that you can further change/modify it acc. to your needs.

Overall this project cover everything you need to build up a mobile controlled car(Hardware+coding).

Step 1: Hardware and Software Required

Hardware:

2 Motors(100-300rpm)
car Chassi
2 Tyres
1 caster weel
Breadboard
Battery 9v
Power Adapter(9-24v)
Male to male wires
L293d IC(Motor driver IC)
Arduino Uno
Bluetooth Module

Softwares

Arduino
Android Studio

Use of these all are explained in next steps...

Step 2: Setup of Hardware

1.First design your car using Chassi, tyres, caster wheel and Motors.

2.Paste breadboard on car using double sided tape.

3.Now again using double sided tape fix Arduno board on breadoard.

there is no restriction on setting up hardware in same way...these are just ideas...

Step 3: Connections

Do connections as shown in figure above.

Here L293d is used because maximum output voltage of Arduino board is 5V. But we want more than 5V to run our Motors therefore we use L293D(Motor driver IC containing two H bridges) which can supply upto 32V to motors.
-To 8th pin of L293D ,you can provide voltage upto 32v ,depend on you how much speed of car you need...

Power Supply to Arduino and Motor

Adapter of required voltage can be used to power IC/Motors and separate 9V battery can be used to power Arduino Board
Please don't suppy Arduino Board more than 12V, it can burn out the the Board.
Paste any insulator(Double sided tap) below Arduino to prevent short circuiting.

Bluetooth Module

Connection of VCC and GND of bluetooth module must be done with arduino 5V and GND.
connect TXD pin to RX pin of Arduino.

If any confusions feel free to write to me...

Step 4: Arduino Code

Download Arduino software and write below code in it...

char command;<br>String string;

  void setup()
  {
     pinMode(2,OUTPUT);//MOTOR1
     pinMode(3,OUTPUT);//MOTOR1
     pinMode(4,OUTPUT);//MOTOR 2
     pinMode(5,OUTPUT);//MOTOR 2
Serial.begin(9600);
    
  }

  void loop()
  {
    if (Serial.available() > 0) 
    {string = "";}
    
    while(Serial.available() > 0)
    {
      command = ((byte)Serial.read());
      
      if(command == ':')
      {
        break;
      }
      
      else
      {
        string += command;
      }
      
      delay(1);
    }
    
    if(string == "F")//Forward
    {
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
       Serial.println(string);
    }
    
    if(string =="B")//Back
    {
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
        Serial.println(string);
    }
    
    if(string =="R")//Turn Right
    {
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
        Serial.println(string);
    }
    
    if(string =="L")//Turn Left
    {
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
        Serial.println(string);
    }
    
    if(string =="S")//Stop
    {
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
        Serial.println(string);
    }
    
 }