Arduino Smart Car Robot

Obstacle avoidance + Bluetooth control + Voice control

Obstacle Avoidance

Ultrasonic sensor detects obstacles and navigates around them

Bluetooth Control

Control the car remotely using a smartphone app

F
B
L
R
S

Voice Control

Forward

Backward

Turn Left

Turn Right

Stop

Voice Commands

❮
❯

Smart Car Robot with Arduino

This project is a multi-functional robot car built using the Arduino platform. It combines three control methods: obstacle avoidance, Bluetooth control, and voice control. The car uses an ultrasonic sensor for navigation, a Bluetooth module for wireless communication, and an L293D motor driver to control the motors. This tutorial will guide you through building this versatile robot car step by step.

Project Features

Obstacle Avoidance Bluetooth Control Voice Commands Ultrasonic Sensor Arduino UNO L293D Motor Driver

Control Methods

The robot car can be controlled using three different methods:

Obstacle Avoidance

The car autonomously navigates around obstacles using the ultrasonic sensor.

Bluetooth Control

Control the car remotely using a smartphone app via Bluetooth.

Voice Control

Operate the car using voice commands through the smartphone app.

Components List

To build this project, you'll need the following components:

Arduino UNO

The brain of the robot

L293D Motor Driver

Controls the motors

Ultrasonic Sensor

Detects obstacles

Bluetooth Module

HC-05 or HC-06

Servo Motor

For sensor movement

Gear Motors

x4 with wheels

Li-ion Batteries

3x 18650 batteries

Jumper Wires

For connections

Circuit Diagram

Circuit Diagram

The circuit connects the Arduino UNO to the motor driver, ultrasonic sensor, Bluetooth module, and servo motor.

Arduino Code

smart_car.ino
#include <Servo.h>
#include <AFMotor.h>

#define Echo A0
#define Trig A1
#define motor 10
#define Speed 170
#define spoint 103

char value;
int distance;
int Left;
int Right;
int L = 0;
int R = 0;
int L1 = 0;
int R1 = 0;

Servo servo;
AF_DCMotor M1(1);
AF_DCMotor M2(2);
AF_DCMotor M3(3);
AF_DCMotor M4(4);

void setup() {
    Serial.begin(9600);
    pinMode(Trig, OUTPUT);
    pinMode(Echo, INPUT);
    servo.attach(motor);
    M1.setSpeed(Speed);
    M2.setSpeed(Speed);
    M3.setSpeed(Speed);
    M4.setSpeed(Speed);
}

void loop() {
    // Uncomment the control method you want to use:
    // Obstacle();
    // Bluetoothcontrol();
    // voicecontrol();
}

void Bluetoothcontrol() {
    if (Serial.available() > 0) {
        value = Serial.read();
        Serial.println(value);
    }
    
    if (value == 'F') {
        forward();
    } else if (value == 'B') {
        backward();
    } else if (value == 'L') {
        left();
    } else if (value == 'R') {
        right();
    } else if (value == 'S') {
        Stop();
    }
}

void Obstacle() {
    distance = ultrasonic();
    if (distance <= 12) {
        Stop();
        backward();
        delay(100);
        Stop();
        L = leftsee();
        servo.write(spoint);
        delay(800);
        R = rightsee();
        servo.write(spoint);
        
        if (L < R) {
            right();
            delay(500);
            Stop();
            delay(200);
        } else if (L > R) {
            left();
            delay(500);
            Stop();
            delay(200);
        }
    } else {
        forward();
    }
}

void voicecontrol() {
    if (Serial.available() > 0) {
        value = Serial.read();
        Serial.println(value);
        
        if (value == '\\') {
            forward();
        } else if (value == '-') {
            backward();
        } else if (value == '<') {
            L = leftsee();
            servo.write(spoint);
            if (L >= 10) {
                left();
                delay(500);
                Stop();
            } else if (L < 10) {
                Stop();
            }
        } else if (value == '>') {
            R = rightsee();
            servo.write(spoint);
            if (R >= 10) {
                right();
                delay(500);
                Stop();
            } else if (R < 10) {
                Stop();
            }
        } else if (value == '*') {
            Stop();
        }
    }
}

// Ultrasonic sensor distance reading
int ultrasonic() {
    digitalWrite(Trig, LOW);
    delayMicroseconds(4);
    digitalWrite(Trig, HIGH);
    delayMicroseconds(10);
    digitalWrite(Trig, LOW);
    long t = pulseIn(Echo, HIGH);
    long cm = t / 29 / 2; // Convert time to distance in cm
    return cm;
}

void forward() {
    M1.run(FORWARD);
    M2.run(FORWARD);
    M3.run(FORWARD);
    M4.run(FORWARD);
}

void backward() {
    M1.run(BACKWARD);
    M2.run(BACKWARD);
    M3.run(BACKWARD);
    M4.run(BACKWARD);
}

void right() {
    M1.run(BACKWARD);
    M2.run(BACKWARD);
    M3.run(FORWARD);
    M4.run(FORWARD);
}

void left() {
    M1.run(FORWARD);
    M2.run(FORWARD);
    M3.run(BACKWARD);
    M4.run(BACKWARD);
}

void Stop() {
    M1.run(RELEASE);
    M2.run(RELEASE);
    M3.run(RELEASE);
    M4.run(RELEASE);
}

int rightsee() {
    servo.write(20);
    delay(800);
    Left = ultrasonic();
    return Left;
}

int leftsee() {
    servo.write(180);
    delay(800);
    Right = ultrasonic();
    return Right;
}

Setup Instructions

Obstacle Avoidance Mode

1. Connect car to computer
2. Remove slashes before Obstacle() in loop
3. Disconnect Bluetooth TX/RX wires
4. Upload code and reconnect wires

Bluetooth Control Mode

1. Connect car to computer
2. Remove slashes before Bluetoothcontrol()
3. Disconnect Bluetooth TX/RX wires
4. Upload code and reconnect wires
5. Install control app on smartphone

Project Team

K

Khaled Wasef

Team Leader

H

Haitham Hisham

Hardware

M

Mohamed Magdy

Programming

B

Basmala Taha

Documentation

F

Fadia Mohamed

Testing

S

Suheila Abdelnasser

Design

Project Information

  • Category Robotics
  • Platform Arduino UNO
  • Components 11+ electronic parts
  • Control Methods 3 modes
  • Complexity Intermediate
  • Supervisors Dr. Asmaa Elsakaan, Dr. Asmaa Barakat

Key Specifications

  • Obstacle Detection 12cm range
  • Motor Speed 170 RPM
  • Bluetooth Range 10 meters
  • Power Supply 3x Li-ion 18650
  • Dimensions 20x15x10 cm

Resources

  • Complete Arduino Code
  • Circuit Diagram
  • Component List
  • Control App Download
  • Assembly Instructions
Download Project Files