How To Make Bluetooth Controlled Robotic Car

Building a Bluetooth-controlled robotic car is one of the most exciting projects for beginners in robotics and electronics. It’s a hands-on way to learn how to work with Arduino, motors, and Bluetooth communication while creating something cool that you can control with your smartphone! Whether you’re a beginner or just looking for a fun weekend project, this guide will walk you through everything you need to know to get your very own Bluetooth-controlled robot on the move.

Components Required:

• Arduino Uno
• L298N Motor Driver Module
• HC-05 Bluetooth Module
• BO Motor*4
• Wheels
• Jumper Wire
• Battery

Circuit Diagram:

Code:

char data; // Variable to store received data

void setup() {
  Serial.begin(9600); // Start serial communication at 9600 baud rate

  // Set motor control pins as output
  pinMode(7, OUTPUT); 
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);

}

void loop() {
  if (Serial.available() > 0) {
    data = Serial.read(); // Read received data

    // Control motor movement based on received data
    switch (data) {
      case 'F': // Move Forward
        digitalWrite(7, HIGH);
        digitalWrite(6, LOW);
        digitalWrite(5, HIGH);
        digitalWrite(4, LOW);
        break;
      case 'B': // Move Backward
        digitalWrite(7, LOW);
        digitalWrite(6, HIGH);
        digitalWrite(5, LOW);
        digitalWrite(4, HIGH);
        break;
      case 'L': // Turn Left
        digitalWrite(7, LOW);
        digitalWrite(6, HIGH);
        digitalWrite(5, HIGH);
        digitalWrite(4, LOW);
        break;
      case 'R': // Turn Right
        digitalWrite(7, HIGH);
        digitalWrite(6, LOW);
        digitalWrite(5, LOW);
        digitalWrite(4, HIGH);
        break;
      case 'S': // Stop
        digitalWrite(7, LOW);
        digitalWrite(6, LOW);
        digitalWrite(5, LOW);
        digitalWrite(4, LOW);
        break;
    }
  }
}

Test and Control with Your Smartphone

Once you’ve uploaded the code to your Arduino, it’s time to test it out. Pair your smartphone with the Bluetooth module (using a Bluetooth app such as Bluetooth Terminal or any custom app that allows serial communication). Open the app, connect to the HC-05/HC-06, and start sending commands like ‘F’, ‘B’, ‘L’, ‘R’, and ‘S’ to control the robot’s movements.

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