🚗 ESP32 Smart Car with PWM Speed Control and Obstacle Detection

This is a smart car project built using the ESP32 microcontroller. The car is remotely controlled via Bluetooth and uses PWM to control motor speed. It also features an ultrasonic sensor to detect obstacles and stop automatically when something is too close.

[Md.Torikul Islam]
🔗 [https://github.com/torikul007]

📋 Features

• 🔁 PWM Motor Speed Control via ENA/ENB pins (0–255)
• 📡 Bluetooth Control using HC-05 module (or use built-in ESP32 Bluetooth)
• 🚧 Obstacle Detection using Ultrasonic Sensor (HC-SR04)
• 🚨 Visual Alert via Buzzer or LED when obstacle detected
• 🔊 Horn & Lights (optional extension)
• 💡 Speed Control using number commands ('0'–'9')

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🧰 Hardware Used

Component	Description
ESP32	Main microcontroller
L298N Motor Driver	Dual H-Bridge motor driver
2 DC Motors	For driving the car
HC-05 Bluetooth	For wireless control via phone/PC
HC-SR04 Ultrasonic	For obstacle detection
Buzzer or LED	For visual/horn alert
18650 Battery x2	Power source
Chassis & Wheels	Smart car body
Jumper Wires	Wiring connections

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🧠 How It Works

1. Bluetooth commands (like 'F', 'B', 'L', 'R') are sent from a phone or PC.
2. ESP32 reads the command through Serial2.
3. For forward movements ('F', 'G', 'I'), the ultrasonic sensor checks if the path is clear.
4. If no obstacle is detected, the car moves; else, it stops and alerts.
5. PWM values control the motor speed via analogWrite(ENA/ENB, speedValue).

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🎮 Command List

Command	Action
F	Move Forward (safe)
B	Move Backward
L	Turn Left
R	Turn Right
G	Forward Left Turn
I	Forward Right Turn
H	Backward Left Turn
J	Backward Right Turn
S	Stop
0–9	Set Speed (low–high)

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🛠️ How to Upload the Code

1. Open Arduino IDE.
2. Select ESP32 Dev Module as board.
3. Connect your ESP32 via USB.
4. Install required libraries (like ESP32Servo.h).
5. Paste the code from main.ino and upload.

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📂 File Structure

✍️ Author

[Md.Torikul Islam]
🔗 [https://github.com/torikul007]