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Bluetooth Controlled Robot Car – Circuit, Code & Components

Learn about a Bluetooth controlled robot car, including the required components, circuit connections, wiring, Arduino code and working principle. Complete step-by-step build instructions are provided with the purchased project through a QR code.

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🎓
Difficulty
Beginner
📱
Control
Bluetooth
🚗
Application
Robot Car
🤖
Project Type
Robotics

Bluetooth Controlled Robot Car

A Bluetooth controlled robot car is a popular Arduino robotics project that allows a small robotic vehicle to be controlled wirelessly using Bluetooth commands from a compatible mobile device.

The project demonstrates how an Arduino controller, Bluetooth module, motor driver and DC motors can work together to create a wireless robotic vehicle.

It is suitable for students, hobbyists, makers and beginners who want to learn about Arduino programming, Bluetooth communication, motor control and basic robotics.

RoboGears provides robotics components and project kits that can be used for building Bluetooth controlled robot car projects.

Components Required

The following components are commonly used for an Arduino Bluetooth controlled robot car.

Component Quantity Purpose
Arduino UNO Development Board 1 Main microcontroller
Bluetooth Module 1 Receives wireless control commands
Motor Driver Module 1 Controls the robot motors
DC BO Motors 2 Drives the robot wheels
Robot Car Chassis 1 Mechanical platform
Robot Wheels 2 Provides movement
Castor Wheel 1 Supports the robot chassis
Battery / Power Supply 1 Powers the robot
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Get the RoboGears robot project and receive access to the complete build guidance through the QR code provided with your purchase.

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Bluetooth Robot Car Circuit Diagram

The circuit connects the Arduino controller, Bluetooth module, motor driver and DC motors to create a wireless controlled robot car.

RoboGears Bluetooth Robot Car Circuit Diagram

Bluetooth Robot Car Wiring & Pin Connections

The main connections allow Bluetooth commands to reach the Arduino, while the motor driver controls the robot's motors.

Bluetooth Module

The Bluetooth module communicates wirelessly with a mobile device and sends movement commands to the Arduino.

Arduino Controller

Arduino receives Bluetooth commands and processes them to determine the required direction of the robot.

Motor Driver

The motor driver receives control signals from Arduino and provides the required motor control for forward, reverse, left and right movement.

DC BO Motors

The motors are connected to the motor driver and rotate according to the movement command received by the controller.

Bluetooth Controlled Robot Car Arduino Code

Example Arduino program for controlling a two-wheel robot car using Bluetooth commands. The movement commands can be sent from a Bluetooth terminal or compatible robot-control application.

/* RoboGears - Bluetooth Controlled Robot Car Example configuration: Bluetooth module: RX/TX -> Arduino serial communication Motor Driver: ENA -> D5 IN1 -> D8 IN2 -> D9 IN3 -> D10 IN4 -> D11 ENB -> D6 Bluetooth commands: F = Forward B = Backward L = Left R = Right S = Stop IMPORTANT: Check your actual circuit diagram before uploading. Pin assignments may need to be changed according to the motor driver and Bluetooth module used. */ const int ENA = 5; const int IN1 = 8; const int IN2 = 9; const int IN3 = 10; const int IN4 = 11; const int ENB = 6; char command; int motorSpeed = 200; void setup() { pinMode(ENA, OUTPUT); pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); pinMode(IN3, OUTPUT); pinMode(IN4, OUTPUT); pinMode(ENB, OUTPUT); Serial.begin(9600); stopRobot(); } void loop() { if (Serial.available() > 0) { command = Serial.read(); switch(command) { case 'F': case 'f': forward(); break; case 'B': case 'b': backward(); break; case 'L': case 'l': left(); break; case 'R': case 'r': right(); break; case 'S': case 's': stopRobot(); break; default: break; } } } /* FORWARD */ void forward() { analogWrite(ENA, motorSpeed); analogWrite(ENB, motorSpeed); digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } /* BACKWARD */ void backward() { analogWrite(ENA, motorSpeed); analogWrite(ENB, motorSpeed); digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); } /* LEFT */ void left() { analogWrite(ENA, motorSpeed); analogWrite(ENB, motorSpeed); digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); } /* RIGHT */ void right() { analogWrite(ENA, motorSpeed); analogWrite(ENB, motorSpeed); digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); } /* STOP */ void stopRobot() { analogWrite(ENA, 0); analogWrite(ENB, 0); digitalWrite(IN1, LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, LOW); }

How the Bluetooth Robot Car Works

The robot uses Bluetooth communication to receive movement commands and Arduino to control the motor driver.

1

Send Command

A movement command such as forward, backward, left, right or stop is sent from a Bluetooth-enabled mobile device.

2

Process Command

The Bluetooth module sends the received command to the Arduino, which determines the required robot movement.

3

Move Robot

Arduino controls the motor driver, which drives the DC motors in the required direction.

Bluetooth Robot Car Troubleshooting

Common problems you may encounter while testing a Bluetooth controlled robot car.

Bluetooth module does not connect Check the Bluetooth module power supply, wiring and serial communication settings.
Robot does not move Check the motor-driver connections, motor power supply and motor driver input connections.
Robot moves in the wrong direction Check the motor polarity and motor-driver wiring. The motor direction can also be changed in the Arduino program.
One motor is not working Check the individual motor wires, motor-driver channel and power connection.
Robot stops or resets unexpectedly Check the battery condition and ensure the motors are receiving a suitable power supply.
Commands are not responding Verify the Bluetooth serial connection and make sure the commands being sent match the characters used in the Arduino program.

Frequently Asked Questions

What is a Bluetooth controlled robot car?

A Bluetooth controlled robot car is a small robotic vehicle that receives wireless movement commands through a Bluetooth module and uses a microcontroller and motor driver to control its motors.

Which controller is used for the robot car?

Arduino boards such as the Arduino UNO can be used as the main controller for this type of robotics project.

How does Bluetooth control the robot?

A Bluetooth module receives commands from a compatible mobile device and passes those commands to the Arduino through serial communication.

What commands can control the robot?

Typical commands include forward, backward, left, right and stop. The exact command characters depend on the Arduino program and Bluetooth control application.

Is this project suitable for beginners?

Yes. A Bluetooth robot car is a popular beginner robotics project for learning Arduino programming, wireless communication and motor control.

Do I get the complete build instructions?

Yes. The detailed step-by-step build guidance is provided with the purchased project through the QR code included with the product.

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Complete Build Guide via QR Code

The detailed step-by-step construction guide is not published on this public project page. When you purchase the RoboGears project, you receive a QR code that provides access to the complete build guide.

Purchase the project, scan the QR code and start building.

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Get the RoboGears Bluetooth Robot Car Project and access the complete build guidance through the QR code included with your purchase.

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