Arduino Bluetooth Car

Arduino Code

1. Include the SoftwareSerial library, which allows you to create a serial communication interface on digital pins of the Arduino board.

#include <SoftwareSerial.h>

2. Define the digital pins that are connected to the TX and RX pins of the Bluetooth module.

int bluetoothTx = 10;
int bluetoothRx = 11;

3. Create a SoftwareSerial object to communicate with the Bluetooth module using the previously defined pins.

SoftwareSerial bluetooth(bluetoothTx, bluetoothRx);

4. Define the input pins of the motor driver module.

int in1 = 4;
int in2 = 5;
int in3 = 6;
int in4 = 7;

5. Define a variable val to store the received command.

int val;

6. Set up the Arduino board by setting the pin modes for the motor driver module inputs and starting serial communication with the Bluetooth module.

void setup()
{
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);

  Serial.begin(9600);
  bluetooth.begin(9600);
}

7. Continuously check for incoming Bluetooth commands using the bluetooth.available() method. If a command is received, read it into the val variable.

Schematic

Make connections according to the circuit diagram given below.

Installing Arduino IDE

First, you need to install Arduino IDE Software from its official website Arduino. Here is a simple step-by-step guide on “How to install Arduino IDE“.

Installing Libraries

Before you start uploading a code, download and unzip the following libraries at /Progam Files(x86)/Arduino/Libraries (default), in order to use the sensor with the Arduino board. Here is a simple step-by-step guide on 'How to Add Libraries in Arduino IDE“

• SoftwareSerial.h

Working Explanation

The code sets up the pins for the Bluetooth module and creates a SoftwareSerial object. It also sets up the pins for controlling the motors of the car. In the loop() function, the code checks for any Bluetooth commands available and stores them in the val variable. It then uses if-else statements to control the direction of the car based on the received command. The digitalWrite() function is used to set the pins for the motor in a particular direction.

For example, if the received command is ‘F’, the car moves forward by setting pin in1 and in3 to HIGH and pin in2 and in4 to LOW. Similarly, for other commands like ‘B’ (backward), ‘L’ (left), ‘R’ (right), ‘S’ (stop), ‘I’ (forward right), ‘J’ (backward right), ‘G’ (forward left), and ‘H’ (backward left), the code sets the pins accordingly to control the motor direction.

Applications

• Education
• Entertainment
• Research
• Home automation
• Surveillance
• Industrial automation