Bluetooth-Controlled Car With HC-05 Module

Build a car that can be controlled wirelessly via a smartphone using Bluetooth communication.

Supplies

Arduino Uno
HC-05 Module
12V Rechargeable Battery
White LED
Geared DC Motor
L298N Motor Driver
Jumper Wires

ATTACH MOTORS TO THE BASE

Attach the motors as shown above

ATTACH ALL THE BOARDS TO THE BASE

Attach the boards according to space available

UPLOAD THE CODE

NOTE - It is advised that Bluetooth module should be attached to Arduino board after uploading code to avoid errors and prevent possible damage to Bluetooth module.

MAKE ALL THE CONNECTIONS

Follow the circuit diagram and make all the connections

ATTACH LIGHTS (OPTIONAL)

SELECTING BATTERIES

I have used 3 x 4 volts rechargeable batteries(lead acid) attached in series for powering the project, in case if the project does not work properly try attaching an additional 9 volts battery to the Arduino through the dc jack.

General Instructions

NOTE - If your car powers on and connects to the app but doesn't move (or only turns left and right but not forward or reverse), then the battery might not be providing sufficient power. Please check the battery and replace it with a fully charged one if necessary.

Additionally, ensure all connections are secure and the Bluetooth module is properly paired with your smartphone.

Default name for Bluetooth module is " HC-05 ".

Default password for Bluetooth module is " 0000 " or " 1234 ".

Download the Arduino Car Connect App to control the car via Bluetooth - Click Here To Download

(Sorry, the app is not available on the Google Play Store, kindly download the apk file and install the app.)

(The app is designed on MIT App Inventor and is safe to use.)

(Alternatively, You can download other apps from Play Store, but you will need to change some settings for the car to work.)

TESTING

a) Power on the car.

b) Open the Arduino Car Connect App.

c) Click on the connect button.

d) Press the direction/light buttons to control the car.

Watch the Video:

For step-by-step instructions about the Arduino Car Connect App and the Car Demo, check out my YouTube video and follow along as we bring this Bluetooth Car to life!

Code

/* BLUETOOTH CAR WITH ARDUINO UNO AND HC-05

THIS CODE DEMONSTRATES CONTROLLING A CAR VIA SMARTPHONE USING BLUETOOTH COMMUNICATION.

NOTE-IT IS ADVISED THAT BLUETOOTH MODULE SHOULD BE ATTACHED TO ARDUINO BOARD AFTER

UPLOADING CODE TO AVOID ERRORS AND PREVENT POSSIBLE DAMAGE TO BLUETOOTH MODULE.

CODE CREATED BY - AMEYA ANGADI

LAST MODIFIED ON - 26/07/2024

VERSION - 1.3

*/

#define led1 = 13

#define in1 = 12

#define in2 = 11

#define in3 = 10

#define in4 = 9

void setup() {

Serial.begin(9600);

pinMode(9, OUTPUT);

pinMode(10, OUTPUT);

pinMode(11, OUTPUT);

pinMode(12, OUTPUT);

pinMode(13, OUTPUT);

}

void loop() {

if (Serial.available() > 0) {

char inputvalue = char(Serial.read());

if (inputvalue == 'F') {

digitalWrite(12, HIGH);

digitalWrite(11, LOW);

digitalWrite(10, HIGH);

digitalWrite(9, LOW);

}

else if (inputvalue == 'B') {

digitalWrite(12, LOW);

digitalWrite(11, HIGH);

digitalWrite(10, LOW);

digitalWrite(9, HIGH);

}

else if (inputvalue == 'R') {

digitalWrite(12, LOW);

digitalWrite(11, LOW);

digitalWrite(10, HIGH);

digitalWrite(9, LOW);

}

else if (inputvalue == 'L') {

digitalWrite(12, HIGH);

digitalWrite(11, LOW);

digitalWrite(10, LOW);

digitalWrite(9, LOW);

}

else if (inputvalue == 'C') {

digitalWrite(12, LOW);

digitalWrite(11, HIGH);

digitalWrite(10, HIGH);

digitalWrite(9, LOW);

}

else if (inputvalue == 'A') {

digitalWrite(12, HIGH);

digitalWrite(11, LOW);

digitalWrite(10, LOW);

digitalWrite(9, HIGH);

}

else if (inputvalue == 'O') {

digitalWrite(13, HIGH);

}

else if (inputvalue == 's') {

digitalWrite(13, LOW);

}

else if (inputvalue == 'S') {

digitalWrite(12, LOW);

digitalWrite(11, LOW);

digitalWrite(10, LOW);

digitalWrite(9, LOW);

}

Downloads

Bluetooth_Car.ino

Bluetooth-Controlled Car With HC-05 Module