How to make Bluetooth Controlled Car using Arduino UNO and L293D Motor Shield with HC-05

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INTRODUCTION

In this project, we will learn how to make a Bluetooth controlled car using Arduino UNO, L293D motor driver shield, and a Bluetooth module.

This robot can be controlled wirelessly using a mobile phone, making it a fun and practical project for beginners in robotics and Arduino.

WATCH YOUTUBE VIDEO

Watch full working of Bluetooth Control Car:

COMPONENTS REQUIRED

Item Image	Item Name	Quantity	Buy
	Arduino UNO	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	L293D Motor Driver Shield	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	HC-05 Bluetooth Module	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	DC Motors	4	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Wheels	4	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Battery Pack (18650)	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Jumper Wires	As Required	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}

TOOLS REQUIRED

Image	Tool Name	Quantity	Buy
	Screwdriver	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}
	Wire Cutter	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}

APPS AND ONLINE SERVICES

Image	App Name	Access
	Arduino IDE	{getButton} $text={Download} $icon={download} $color={#007bff}
	Bluetooth Control App	{getButton} $text={Download} $icon={download} $color={#007bff}

WIRING CONNECTIONS

Bluetooth Module ↔ Arduino

HC-05	Arduino
VCC	5V
GND	GND
TX	RX (Pin 0)
RX	TX (Pin 1)

Motor Shield

Attach L293D motor shield directly on Arduino UNO and connect motors to M1, M2, M3, M4 ports.

ARDUINO CODE

char data; /* Arduino Bluetooth Controlled Car Install Adafruit Motor Shield Library before uploading this code. AFMotor Library https://learn.adafruit.com/adafruit-motor-shield/library-install -> If you need helping guide on how to install library for the motor shield or how to use motor shield then watch this: https://youtu.be/vooJEyco1J4 Caution: Remove the jumper or switch off the battery switch before connecting the Arduino board to computer. For more support contact me on Telegram: @UtGoTech */ #include <AFMotor.h> #include <SoftwareSerial.h> SoftwareSerial bluetoothSerial(9, 10); // RX, TX //initial motors pin AF_DCMotor motor1(1, MOTOR12_1KHZ); AF_DCMotor motor2(2, MOTOR12_1KHZ); AF_DCMotor motor3(3, MOTOR34_1KHZ); AF_DCMotor motor4(4, MOTOR34_1KHZ); char command; void setup() { bluetoothSerial.begin(9600); //Set the baud rate to your Bluetooth module. } void loop() { if (bluetoothSerial.available() > 0) { command = bluetoothSerial.read(); Stop(); //initialize with motors stoped switch (command) { case 'F': forward(); break; case 'B': back(); break; case 'L': left(); break; case 'R': right(); break; } } } void forward() { motor1.setSpeed(255); //Define maximum velocity motor1.run(FORWARD); //rotate the motor clockwise motor2.setSpeed(255); //Define maximum velocity motor2.run(FORWARD); //rotate the motor clockwise motor3.setSpeed(255); //Define maximum velocity motor3.run(FORWARD); //rotate the motor clockwise motor4.setSpeed(255); //Define maximum velocity motor4.run(FORWARD); //rotate the motor clockwise } void back() { motor1.setSpeed(255); //Define maximum velocity motor1.run(BACKWARD); //rotate the motor anti-clockwise motor2.setSpeed(255); //Define maximum velocity motor2.run(BACKWARD); //rotate the motor anti-clockwise motor3.setSpeed(255); //Define maximum velocity motor3.run(BACKWARD); //rotate the motor anti-clockwise motor4.setSpeed(255); //Define maximum velocity motor4.run(BACKWARD); //rotate the motor anti-clockwise } void left() { motor1.setSpeed(255); //Define maximum velocity motor1.run(BACKWARD); //rotate the motor anti-clockwise motor2.setSpeed(255); //Define maximum velocity motor2.run(BACKWARD); //rotate the motor anti-clockwise motor3.setSpeed(255); //Define maximum velocity motor3.run(FORWARD); //rotate the motor clockwise motor4.setSpeed(255); //Define maximum velocity motor4.run(FORWARD); //rotate the motor clockwise } void right() { motor1.setSpeed(255); //Define maximum velocity motor1.run(FORWARD); //rotate the motor clockwise motor2.setSpeed(255); //Define maximum velocity motor2.run(FORWARD); //rotate the motor clockwise motor3.setSpeed(255); //Define maximum velocity motor3.run(BACKWARD); //rotate the motor anti-clockwise motor4.setSpeed(255); //Define maximum velocity motor4.run(BACKWARD); //rotate the motor anti-clockwise } void Stop() { motor1.setSpeed(0); //Define minimum velocity motor1.run(RELEASE); //stop the motor when release the button motor2.setSpeed(0); //Define minimum velocity motor2.run(RELEASE); //rotate the motor clockwise motor3.setSpeed(0); //Define minimum velocity motor3.run(RELEASE); //stop the motor when release the button motor4.setSpeed(0); //Define minimum velocity motor4.run(RELEASE); //stop the motor when release the button }

WORKING PRINCIPLE

The Bluetooth module receives commands from your mobile phone and sends them to Arduino. Arduino processes the signals and controls the motors through the motor driver.

TIPS

• Use correct baud rate (9600)
• Check TX-RX connections carefully
• Use fully charged battery

CONCLUSION

This project helps you learn wireless control and motor driving using Arduino. It is a great step towards building advanced robotics projects.