Build Bluetooth Control Robotic Car with Arduino

November 26, 2023

"How can you build a Bluetooth-controlled robot car with Arduino?"

Introduction:

Bluetooth-controlled robots powered by Arduino—a thrilling project that combines the power of technology and the joy of hands-on creation. Get ready to embark on a journey where wires meet wireless connectivity, and circuits dance to the beat of your imagination.

Here is the flowchart to understand how a Bluetooth-controlled robot works. Let us learn how to create this type of robot at home.

Arduino, the heart of our project, is an open-source electronics platform that has become the go-to choice for makers and tinkerers worldwide. Its user-friendly interface and vast community support make it the perfect companion for turning your robotic dreams into reality.

Bluetooth Magic:

What makes our robot truly enchanting is its wireless powers through Bluetooth technology. By integrating a Bluetooth module with Arduino, you open up a world of possibilities. Imagine controlling your robot from your smartphone or computer with just a few steps—the future of robotics is at your fingertips!

Building Blocks of Brilliance:

Let's break down the essential components for our Bluetooth-controlled robot:

Arduino Board: The brain of the operation.

Motor Drivers: To control the robot's movements.

Motors and Wheels: To move your robotics car.

Bluetooth Module: The bridge between your device and the robot.

Coding Adventure:

Now, here comes the exciting part—coding! With Arduino's easy-to-learn programming language, you can breathe life into your robot. Create functions to move forward, backward, and turn, which are left and right.

Let’s build a Bluetooth-controlled car with Arduino.

Here's a basic guide to get you started:

Components required :

Bluetooth Module HC-05
4 DC gear motors with 4 wheels.
L298n Motor driver
Arduino Uno board
Male-female jumper wire
7.4 v lithium ion battery
Robotic car chassis.
Glue gun with sticks, and as per requirement.

Step-by-Step Guide to Building Your Bluetooth Car:

Arduino UNO Board:

The brains behind the operation, Arduino serves as the central hub for processing commands and controlling the car's movements.

L298n Motor Driver:

Choose a motor driver capable of driving the motors in both directions, allowing your car to go forward and backward.

DC Motors and Wheels:

The heart of your car, DC motors drive the wheels and propel your creation across various terrains.

Bluetooth Module:

Integrate a Bluetooth module (such as HC-05 or HC-06) for wireless communication, enabling you to control the car from a distance.

Battery Pack:

Power up your car with a suitable battery pack, ensuring it provides enough voltage to drive the motors and Arduino.

Jumper Wires:

Connect the components seamlessly with a set of jumper wires.

Robotic Car Chassis:

Select or build a chassis that suits your design preferences and accommodates the chosen motors and wheels.

1. Assemble the Chassis:

Begin by assembling the chassis, attaching the motors and wheels securely. After the assembling part, the robot car looks like this.

2. Connect Motors to the Motor Driver:

Wire the DC motors to the motor driver, ensuring the correct polarity for each motor.

3. Connect Motor Driver to Arduino:

Establish connections between the motor driver and the Arduino board, linking the input pins on the motor driver to the digital pins on the Arduino.

4. Integrate the Bluetooth Module:

Connect the TX pin of the Bluetooth module to the RX pin of the Arduino and vice versa. Connect the VCC and GND pins of the Bluetooth module to the corresponding pins on the Arduino.

5. Power Up:

Connect the battery pack to power both the Arduino and the motors via the motor driver.

6. Upload Arduino Code:

Paste a simple Arduino code that reads Bluetooth commands and controls the motors accordingly.

Note: Before you're going to upload the code, please remove the TX & RX connection between the Bluetooth module and Arduino Uno.

Source of Bluetooth-control Robotic car

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int m1a = 9;
int m1b = 10;
int m2a = 11;
int m2b = 12;
int enA = 6; // Enable A (speed control) pin
int enB = 5; // Enable B (speed control) pin
char command;
void setup() {
  pinMode(m1a, OUTPUT);
  pinMode(m1b, OUTPUT);
  pinMode(m2a, OUTPUT);
  pinMode(m2b, OUTPUT);
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  
  // Initialize motor speed to 0 (stopped)
  analogWrite(enA, 0);
  analogWrite(enB, 0);
  
  Serial.begin(9600);
}
void loop() {
 
 
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7: Control the Robot

Pair your Bluetooth module with your smartphone or computer. Send commands (e.g., 'F' for forward, 'B' for backward, 'L' for left, and 'R' for right) via the terminal app to control the robot.