ABSTRACT
This project presents the design and implementation of a voice-controlled mobile robot operated through Bluetooth communication. The main objective is to control the robot’s movement—forward, backward, left, right, and stop—using simple voice commands from a smartphone. The system uses an Arduino microcontroller as the control unit, which receives command strings through a Bluetooth module connected via serial communication. A voice control mobile application converts the user’s spoken words into text commands and transmits them wirelessly to the robot. Based on the received command, the Arduino generates control signals to a motor driver module, which provides the required current to drive two DC motors. The robot chassis movement is achieved by switching motor directions through the motor driver outputs. This low-cost and user-friendly system demonstrates reliable wireless voice-based control and can be extended for assistive robotics, smart navigation, and automation applications.
INTRODUCTION
In recent years, robotics and wireless communication technologies have gained significant importance in automation, smart control systems, and assistive applications. Traditional robotic systems often require manual control using wired connections or remote controllers, which can limit mobility and convenience. To overcome these limitations, wireless technologies such as Bluetooth have been widely adopted for short-range communication between devices.
A voice-controlled robot is an advanced robotic system that responds to spoken commands from the user. Instead of using physical buttons or joysticks, the robot can be controlled through voice instructions like forward, backward, left, right, and stop. This makes the system more user-friendly, especially for elderly individuals and physically challenged persons who may find manual control difficult.
In this project, Bluetooth communication is used to establish a wireless connection between a smartphone and the robot. A voice control mobile application converts speech into text commands and sends them to the robot via a Bluetooth module. The Arduino microcontroller processes these commands and controls the motor driver, which drives the DC motors accordingly.
The system is simple, cost-effective, and efficient for short-range wireless robotic control. It also provides a foundation for future developments in smart robotics, home automation, and intelligent assistive systems. By integrating voice recognition with embedded systems, this project demonstrates an effective method of human–machine interaction.


Objectives
• To design and develop a voice-controlled mobile robot.
• To establish wireless communication using Bluetooth between smartphone and robot.
• To use an Arduino microcontroller for processing received commands.
• To control robot movements such as forward, backward, left, right, and stop.
• To interface a motor driver module for controlling DC motors.
• To develop a simple and user-friendly voice control mobile application.
• To create a low-cost and efficient robotic control system.

Block Diagram