Impact Factor (2025): 6.9
DOI Prefix: 10.47001/IRJIET
This
project presents the design a development of an offline voice-controlled
wireless device control system using the AI-Thinker VC-02 voice recognition
module and ESP32microcontrollers. The main objective of the project is to
control electrical devices through voice commands without the use of internet
connectivity, ensuring fast response, reliability, and enhanced privacy. The
system utilizes embedded technology and wireless communication to provide a
compact and efficient automation solution. The proposed system consists of two
ESP32 microcontrollers communicating through the ESP-NOW wireless protocol. The
transmitter section includes the VC-02 offline voice recognition module
interfaced with an ESP32. This module is capable of recognizing predefined
voice commands and transmitting corresponding hexadecimal command signals
through serial communication. The ESP32 receives these commands and sends them
wirelessly to another ESP32 using ESP-NOW, a low-power peer-to-peer
communication protocol that does not require a Wi-Fi router or internet
connection. The receiver ESP32 processes the received command and controls
connected output devices such as an LED and a 12V DC fan using 2N2222
transistor switching circuits. The use of transistors instead of relay modules
ensures faster switching, compact design, and reduced power consumption. The
system demonstrates efficient wireless communication and reliable device
control based on voice commands. This project offers a cost-effective, secure,
and scalable solution for smart automation systems. It can be applied in smart
homes, industrial automation, and assistive technologies where hands-free
device control is required. The system can be further expanded to include
multiple devices, display units, and additional automation features, making it
suitable for real-time and practical applications in modern embedded systems.
Country : India
IRJIET, Volume 10, Issue 2, February 2026 pp. 95-101