How to Build a Bluetooth Control Car with Arduino Nano and HC-05 Module

Hello and Welcome back! In this project, you’ll learn how to build your own Bluetooth control car using an Arduino Nano board, an HC-05 Bluetooth module, and an L298N motor driver. To make the car chassis, I have used the rigifoam. By combining the regiform with other low-cost materials like gear motors, batteries, and jumper wires, we’ll be able to create a fully functional car that can be controlled remotely using your smartphone or tablet.

But that’s not all! With the SriTu Hobby app, you’ll have access to three different types of remotes – manual, gesture, and voice – giving you even more options for controlling your car. This project is a great way to explore the world of electronics and learn more about how they can be used to create amazing devices.

You can download the SriTu Hobby app using this link — Download

OK let’s do this project step by step. The required components are given below.

Arduino Nano board — Our Store / Amazon
HC-05 Bluetooth module — Our Store / Amazon

L298N motor driver — Our Store / Amazon
Gear motors — Our Store / Amazon
Robot wheels — Our Store / Amazon

Caster wheel — Our Store / Amazon
Li-ion Batteries — Amazon
Battery holder — Our Store / Amazon

Jumper wires — Our Store / Amazon
Breadboard — Our Store / Amazon

Disclosure: These Amazon links are Affiliate links. As an Amazon Associate, I earn from qualifying purchases.

Step 1

Firstly, identify these components.

Step 2

Secondly, let’s create the chassis of this car. For that use the following sizes. I used a piece of rigifoam for that. But you can use foam board or cardboard.

Step 3

Thirdly, cut the car chassis into the following shape.

Step 4

Next, connect the robot wheels for the gear motors. Then install them on the front of the car.

Step 5

Now, drill two holes near the gear motors and put the wires through these holes.

Step 6

Next, install the rear wheel on the car chassis. Use the following images for that.

Step 7

Then, place the motor driver on top of the car chassis. After that, connect the gear motors to it.

Step 8

Now, place the Arduino Nano board and Bluetooth module on the breadboard. Then, connect the Bluetooth module to the Arduino Nano board. Use the circuit diagram below for that.

Step 9

After that, install the breadboard on the car chassis. Next, connect the motor driver board to the Arduino nano board.

Step 10

Now, install the li-ion battery holder on the top of the car chassis. And then, connect it to the motor driver board. For that, you use can use the circuit diagram above.

Step 11

Next, connect the Arduino Nano board to the computer. And then, upload the program to the Arduino board.

Code and circuit diagram — Download

/*Bluetooth control car with Arduino Nano board
   Home Page

*/

#define IN1 2
#define IN2 3
#define IN3 4
#define IN4 5

#define ENA 9
#define ENB 10

#define Speed 180

void setup() {
  Serial.begin(9600);
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);
}

void loop() {
  if (Serial.available() > 0) {
    char value = Serial.read();
    Serial.println(value);

    if (value == 'U') {
      Forward();
    } else if (value == 'D') {
      Backward();
    } else if (value == 'S') {
      Stop();
    } else if (value == 'L') {
      Left();
    } else if (value == 'R') {
      Right();
    }
  }
}

void Forward() {
  analogWrite(ENA, Speed);
  analogWrite(ENB, Speed);
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}
void Backward() {
  analogWrite(ENA, Speed);
  analogWrite(ENB, Speed);
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}
void Stop() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
}
void Left() {
  analogWrite(ENA, Speed);
  analogWrite(ENB, Speed);
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}
void Right() {
  analogWrite(ENA, Speed);
  analogWrite(ENB, Speed);
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}

Now, copy and paste this code to the Arduino IDE. And then, select board and port.

Next, remove the RX and TX jumper wires. And then, click the upload button.

Reconnect the jumper wires after this code is uploaded.

Step 12

Next, remove the USB cable and put the batteries into the battery holder.

Step 13

Now let’s set up the Bluetooth controller app step by step. Follow the instructions below for that.

First, download and install the SriTu Hobby app from the play store.
SriTu Hobby app — Download
Now, open this app and click the “control” button.

Then select Remote Control.

Next, click on the gear wheel button and find your device. In this case, you need to enable location and location permission. And then, select your device. Then, it will connect.
Also, you can change the modes using the arrow button.

Troubleshooting tips

Check that all of the connections,
Check that the code has been uploaded correctly to the Arduino Nano board.
Check your power source.

In conclusion, this is a fun and easy project that anyone can do with a few simple materials. You can also customize the car by adding more features or modifying the code. The full video guide is below. We hope to see you in our upcoming projects and tutorials.

How to Build a Bluetooth Control Car with Arduino Nano and HC-05 Module