BLUETOOTH RACE CAR

Project is Four-Wheel Drive Racing Car Controlled via Bluetooth from a Smartphone.

Introduction

This project is one of the first attempts to build a small racing car that can be controlled via a smartphone using Bluetooth technology. This car features four-wheel drive, making it flexible and easy to maneuver, along with a quick response to commands. Remote control provides the user with an enjoyable and innovative driving experience through a simple mobile application.
Car Features

Easy to drive from the phone: The car can be controlled through a smartphone application using Bluetooth technology.
Instant response: The car responds quickly and immediately to commands sent from the phone.
Four-wheel drive: The car is equipped with four motors that provide four-wheel drive, allowing for better control and stronger performance on various surfaces.

Four-Wheel Drive Benefits

Ability to change direction: Thanks to the four-wheel drive system, the car can change direction left or right from the same point of stability, enhancing its maneuverability.

Components Used

Arduino Uno
Driver L298N
4 Motors
Two 18650 Batteries
Horizontal Dual Battery Holder
Connecting Wires
On/Off Switch

Explanation of Components

1. Arduino Uno

It is an open-source development board based on a microcontroller that allows control of electronic components. It is programmed in the Arduino language and is responsible for receiving commands from the HC-05 Bluetooth module and executing them on the car.

2. Driver L298N

It is a motor control unit used to control the direction and speed of electric motors. It allows for separate control of the four motors, providing the car with greater maneuverability.

3. HC-05

It is a Bluetooth module used to enable wireless communication between the smartphone and the car. It operates in the 2.4GHz frequency range and is known for its ease of programming and use.

Wiring Diagram

[Insert the wiring diagram showing how to connect the components together here.]

Code

				
					//code from chat gpt

// Define the motor driver pins connected to the Arduino

#define IN1 8    // Input 1 for Motor A

#define IN2 7    // Input 2 for Motor A

#define IN3 6    // Input 1 for Motor B

#define IN4 5    // Input 2 for Motor B

// Bluetooth module pin

#define bluetoothSerial Serial

void setup() {

  // Set all motor driver pins as output

  pinMode(IN1, OUTPUT);

  pinMode(IN2, OUTPUT);

  pinMode(IN3, OUTPUT);

  pinMode(IN4, OUTPUT);

  // Start serial communication at 9600 baud rate

  bluetoothSerial.begin(9600);}

void loop() {

  // Check if there is any data available from the Bluetooth module

  if (bluetoothSerial.available()) {

    char command = bluetoothSerial.read(); // Read the incoming data

    // Control the car based on the command received

    switch (command) {

      case 'F': // Move Forward

        moveForward();

        break;

      case 'B': // Move Backward

        moveBackward();

        break;

      case 'L': // Turn Left

        turnLeft();

        break;

      case 'R': // Turn Right

        turnRight();

        break;

      case 'S': // Stop the car

        stopCar();

        break;}}}

// Function to move the car forward

void moveForward() {

  digitalWrite(IN1, HIGH);

  digitalWrite(IN2, LOW);

  digitalWrite(IN3, HIGH);

  digitalWrite(IN4, LOW);}

// Function to move the car backward

void moveBackward() {

  digitalWrite(IN1, LOW);

  digitalWrite(IN2, HIGH);

  digitalWrite(IN3, LOW);

  digitalWrite(IN4, HIGH);}

// Function to turn the car left

void turnLeft() {

  digitalWrite(IN1, LOW);

  digitalWrite(IN2, HIGH);

  digitalWrite(IN3, HIGH);

  digitalWrite(IN4, LOW);}

// Function to turn the car right

void turnRight() {

  digitalWrite(IN1, HIGH);

  digitalWrite(IN2, LOW);

  digitalWrite(IN3, LOW);

  digitalWrite(IN4, HIGH);

}

// Function to stop the car

void stopCar() {

digitalWrite(IN1, LOW);

  digitalWrite(IN2, LOW);

  digitalWrite(IN3, LOW);

  digitalWrite(IN4, LOW);
}

Application Used for Control

The Bluetooth RC Controller application was used to control the car, allowing commands to be sent from the phone to the car via Bluetooth.

Problems Encountered

Problem of motor stopping when placed on the table: When the car was lifted, the motors were running slowly. After investigation, it was found that the cause was a drop in the voltage and current available to the motors.
– Solution: Replace the batteries with higher efficiency ones.

2. The car moved strangely: Upon powering the car, we noticed that its movement was abnormal.
– Solution: Correct the connections of the motors to the Driver L298N.