IMPLEMENTATION OF VOICE-CONTROLLED WHEELCHAIR BASED ON PULSE WIDTH MODULATION

Abstract

In this thesis, the innovative and low-cost self-assistive design of wheelchair for the intended users is implemented to facilitate the control of voice commands. Moreover, the implementation of voice-controlled wheelchair focuses on Arduino, Voice recognition module and Motors in construction. The speed controller also performs by changing the average voltage sent to the motor by switching the motor supply on and off very quickly using Pulse Width Modulation (PWM) technique. The voice recognition module operates on user’s voice commands and the corresponding coded data stored in the memory of the Arduino Microcontroller. Arduino Microcontroller controls all the direction accordingly. The voice-controlled wheelchair can detect any obstacles in the way of wheelchair with the use of ultrasonic sensor. It provides more independent and easy access for the wheelchair users who cannot control their movements especially by hands. It is designed for the users to perform certain tasks using their voices. Besides, the user can easily speak their commands to the microphone making more user-friendly and independent. The movements of the voice-controlled wheelchair in environmental noise area and silent area are experimented in this thesis. According to the experimental results, the percentage of the voice commands accuracy in silent area is better than environmental noise area because the voice module can catch more commands in silent area.