🚗 Bluetooth Car Controller

A Bluetooth-controlled car using Arduino and a Python desktop GUI built with Tkinter.

📦 Project Structure

• arduino/ – Arduino sketch to control the car motors via HC-05 Bluetooth module.
• python_gui/ – A desktop app built in Python using Tkinter to send control signals.
• images/ – Screenshots or visual assets (optional).

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🛠 Hardware Used

• Arduino Uno/Nano
• HC-05 Bluetooth Module
• L298N Motor Driver
• 2 DC Motors
• Jumper Wires
• Power Supply
• Python-capable PC
• Toy Wheels

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Wiring Guide for Bluetooth Car Controller

Arduino UNO Pin Connections

Component	Arduino Pin / Connection	Notes
HC-05 Bluetooth
HC-05 TX	D10 (Arduino RX via SoftwareSerial)	Connect directly
HC-05 RX	D11 (Arduino TX via voltage divider)	Use 1kΩ + 2kΩ voltage divider to step 5V → 3.3V
HC-05 VCC	5V	Do NOT use 3.3V pin
HC-05 GND	GND
HC-05 KEY (optional)	Leave unconnected	Only if you want to enter AT command mode

L298N Motor Driver	Arduino Pin / Connection	Notes
IN1	D2	Controls Motor A direction
IN2	D3	Controls Motor A direction
IN3	D4	Controls Motor B direction
IN4	D5	Controls Motor B direction
ENA	D6 (PWM)	Controls Motor A speed
ENB	D7 (PWM)	Controls Motor B speed
12V (Motor Power)	Connect to external battery (7.4V–12V)	Powers motors, NOT Arduino!
GND	Connect to battery GND and Arduino GND	Common ground is essential
5V Output (optional)	Can power Arduino if jumper on L298N	Or leave disconnected if Arduino powered by USB

Motors	Connect to L298N Motor Outputs

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Important Notes

• Voltage Divider: Use a simple resistor divider on HC-05 RX pin to avoid damaging the module (5V Arduino TX → 3.3V HC-05 RX).
• Power Supply:
  • Use a separate battery (7.4V–12V Li-ion or NiMH pack) to power motors through the L298N.
  • Do NOT power motors from Arduino 5V pin.
• Common Ground: Make sure Arduino GND, battery GND, and L298N GND are connected together.
• SoftwareSerial Pins: D10 is RX (Arduino receives), D11 is TX (Arduino transmits).
• PWM Pins: D6 and D7 support PWM for speed control.

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🚘 Commands Used

Command	Action
F	Move Forward
B	Move Backward
L	Turn Left
R	Turn Right
S	Stop

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🧠 How It Works

1. The Arduino listens for single-character commands over Bluetooth (F, B, L, R, S).
2. The Python GUI sends these commands via serial when buttons are pressed.
3. Motors are controlled through the L298N driver based on the command.

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🐍 Python GUI

Run the GUI with:

cd python_gui
python bt_car_controller.py

Install required dependencies:

bash
Copy
Edit
pip install pyserial

🔐 Permissions
Make sure your user has permission to access the COM port (on Linux/Mac, add user to dialout group).


📄 License
This project is MIT Licensed. Feel free to use, modify, and share!