BT Controlled Car Using Arduino and L298N | New Topic

In this blog, we are going to know about the BT Controlled Car Using Arduino and L298N. Welcome to Poly Notes Hub, a leading destination for diploma and degree engineering notes for engineering students.

Author Name: Arun Paul.

BT Controlled Car Using Arduino and L298N

The Arduino UNO, HC-05 Bluetooth module, L298N motor driver, and two DC motors will be used in this project to create a Bluetooth-controlled automobile. This car can be wirelessly controlled with a smartphone and a Bluetooth controller app, allowing us to maneuver it forward, backward, left, and right with simple commands.

The primary goal of this project is to understand how to connect a Bluetooth module to Arduino and control the movement of a robot car. It’s a terrific entry-level robotics and electronics project for students, amateurs, and DIY enthusiasts.

What You Will Learn From this Project?

• Connect and configure the HC-05 Bluetooth module.
• Control DC motors using the L298N motor driver.
• Program Arduino to respond to Bluetooth commands.
• Use a mobile app to wirelessly control a robot.

Required Components for BT (HC-05) Controlled Car

Here is the list of required components in this project –

1. Arduino UNO
2. HC-05 Bluetooth Module
3. L298N Motor Driver Module
4. 2 DC Motors (connected to wheels)
5. Chassis, wheels, caster wheel
6. Battery pack (6V–12V, depending on motor specs)
7. Jumper wires
8. Smartphone (with a BT Controller app like “Arduino Bluetooth Controller”)

📌 Learn About L298N Motor Driver Module – Click Here to Learn | 📌 If you want know more about Bluetooth Module HC-05 then Click Here | 📌 Click Here to take a tour on Arduino Uno and its Pinout Details.

Wiring Guide of HC-05 to UNO & L298N Motor Driver

HC-05 to Arduino UNO

L298N Motor Driver

Arduino Code (Copy it and Upload it to Arduino)

char command;

void setup() {
  Serial.begin(9600);
  pinMode(4, OUTPUT); // IN4
  pinMode(5, OUTPUT); // IN3
  pinMode(6, OUTPUT); // IN2
  pinMode(7, OUTPUT); // IN1
}

void loop() {
  if (Serial.available() > 0) {
    command = Serial.read();
    stopCar(); // Default to stop before any command
    
    switch (command) {
      case 'F': forward(); break;
      case 'B': backward(); break;
      case 'L': left(); break;
      case 'R': right(); break;
      case 'S': stopCar(); break;
    }
  }
}

void forward() {
  digitalWrite(7, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
}

void backward() {
  digitalWrite(7, LOW);
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(4, HIGH);
}

void left() {
  digitalWrite(7, LOW);
  digitalWrite(6, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
}

void right() {
  digitalWrite(7, HIGH);
  digitalWrite(6, LOW);
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
}

void stopCar() {
  digitalWrite(7, LOW);
  digitalWrite(6, LOW);
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
}

Bluetooth Control App for Wireless Communication

Use any free app like:

• Arduino Bluetooth Controller by “Giumig Apps” (Android)
• Map buttons to send: F, B, L, R, S