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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 12 Issue: 12 | Dec 2025

p-ISSN: 2395-0072

www.irjet.net

VOICE-CONTROLLED ASSISTANCE FOR ROBOT NAVIGATION USING ANDROID BASED MOBILE DEVICES Chandana M1, Nikhilashree M2, Sneha v3, Lalitha H4, Dept .of E&IE Bangalore Institute of Technology Bengaluru, India Dept .of E&IE Bangalore Institute of Technology Bengaluru, India Dept .of E&IE Bangalore Institute of Technology Bengaluru, India Assistant professor Dept .of E&IE Bangalore Institute of Technology Bengaluru, India -----------------------------------------------------------------------***------------------------------------------------------------------------Abstract— this project presents a voice-controlled robotic car that can be operated using an Android mobile application

through Bluetooth communication. Instead of using physical switches or remote controls, the user gives simple voice commands such as “forward,” “left,” “right,” “backward,” or “stop,” which the app converts into text and sends to the robot. The Adriano Uno receives these commands and controls the L298N motor driver to move the car in the required direction. The system uses an HC-05/HC- 06 Bluetooth modules for wireless connectivity and DC motors for smooth movement. To make the system more interactive, a DF Player Mini and speaker can be added to provide audio feedback for each command. This project demonstrates how voice recognition and embedded systems can be combined to create an easy-to-use, low-cost, and user-friendly robotic car, suitable for beginners, educational purposes, and applications where hands-free control is required.

INTRODUCTION

Voice-controlled systems have become an important part of modern technology because they allow users to interact with devices in a more natural and comfortable way. With the rapid growth of smartphones, wireless communication, and embedded electronics, voice recognition has become easier to use and more reliable. Today, mobile applications can quickly convert spoken words into text, making hands-free control possible in many applications such as home automation, robotics, and assistive devices. This project uses these advancements to design a robotic car that can be operated entirely through voice commands given from an Android mobile phone. The aim of this system is to eliminate the need for physical remotes, switches, or joysticks by enabling the user to simply speak commands like “forward,” “left,” “right,” “backward,” or “stop.” The Android application receives the user's voice, converts it using speech-to-text technology, and sends it to the robot through Bluetooth communication. The HC-05/HC-06 Bluetooth module receives the instruction and passes it to the Arduino Uno, which is programmed to interpret the command and control the L298N motor driver accordingly. As a result, the DC motors rotate in the required direction, allowing the car to move smoothly and accurately in response to the spoken commands. This project highlights the growing importance of human– machine interaction (HMI), showing how machines can be made easier to operate through simple voice input instead of traditional manual controls. It also demonstrates how embedded systems, mobile applications, and wireless technologies can be integrated to create a powerful real-time control system. Additionally, the implementation is cost-effective, making it suitable for educational purposes, home automation projects, and applications for people with disabilities who may find it difficult to operate physical controls. Beyond its basic functionality, the voice-controlled robotic car can be extended with additional features such as obstacle detection sensors, camera modules, GPS navigation, and IoT connectivity. These possibilities show that voice- controlled robots have a wide range of applications—from smart home delivery robots to assistance robots in healthcare and security. The project thus provides a strong foundation for understanding modern robotics and offers opportunities for further innovation and research.

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RELATED WORK

Voice-controlled robotic systems have gained significant attention in recent years due to the rapid growth of mobile technology, embedded systems, and human–machine interaction (HMI). Early research in this field mainly explored the use of simple wireless control mechanisms such as RF modules, infrared transmitters, and manual remote controllers. Although these methods enabled basic robotic movement, they were limited by short distance, line-of-sight requirements, and lack of interactive feedback. With the evolution of smartphones and speech-recognition technologies, researchers began experimenting with voicebased interfaces to operate robots more intelligently and conveniently. One of the earliest approaches used PC-based

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