Voice Controlled Wheelchair

This Project aims to design and construct a voice-controlled wheelchair for paralyzed people or who are handicapped and face troubles in driving a wheelchair by a joystick. This project provides them a smooth self-drive if they want top travel. Moreover, the wheelchair will detect objects, stairs or

Project Title

Voice Controlled Wheelchair

Project Area of Specialization

Information & Communication Technology

Project Summary

This Project aims to design and construct a voice-controlled wheelchair for paralyzed people or who are handicapped and face troubles in driving a wheelchair by a joystick. This project provides them a smooth self-drive if they want top travel. Moreover, the wheelchair will detect objects, stairs or potholes then stops automatically and waits for next instruction. The project principal consists of motor system and voice recognition module controlled by a microcontroller. Automatic obstacle detection system and depth detection system consists of ultrasonic sensors and photoelectric sensors respectively. Therefore, this wheelchair is more comfortable and safer for people with physically disability and also provides automatic protection.

Project Objectives

Several steps has been taken in the international market to bring a wheelchair that can be operated via hand or joystick. Some have made an automatic wheelchair but it is not that smart which can detect on the way objects and make automatic brakes. there is a well-defined need for a wheelchair with voice recognition to help people with physical disability who cannot control their movements especially with hands more independent. Consequently, this paper describes the design and development of a voice controlled automatic wheelchair by proposing a wheelchair that can be operated by the simple voice commands given by the user. In addition, the developed wheelchair is equipped with the ultrasonic sensors to stop the movement of the wheelchair when any obstacles are detected. This will provide more safety to the users.

Project Implementation Method

he schematic diagram and circuit diagram of the developed voice controlled automatic wheelchair are presented in Figures 1 and 2, respectively. The microphone is used to receive the voice commands from the user and then convert them into the electrical signals. The electrical signals are transferred to the voice module to digitize and store the voice signals as template, which indicates the commands from the users. In order to use the developed system, the voice of the user must be trained before that command is stored in the voice module. When the user provides the command to the system, if the user command matches to the stored command, the voice module gives the output to the microcontroller. In addition, the microcontroller also receives the output signals from the front and rear ultrasonic sensors, which works as an obstacle detection unit. The microcontroller output is attached to the motor speed control module and the electrical actuator. Four relay modules (numbers 1-4) are utilized to control the direction for the rotation of the DC motors giving the movement of the developed wheelchair in the forward and backward directions. In addition, two relay modules (numbers 5 and 6) are included to control the electrical actuator giving the movement of the developed wheelchair in the left and right directions. The operating voltages of 9V, 12V and 24V from battery are used to supply to the microcontroller system, the electrical actuator and the motor speed control module, respectively

Benefits of the Project

This project provides them a smooth self-drive if they want top travel. Moreover, the wheelchair will detect objects, stairs or potholes then stops automatically and waits for next instruction. The project principal consists of motor system and voice recognition module controlled by a microcontroller. Automatic obstacle detection system and depth detection system consists of ultrasonic sensors and photoelectric sensors respectively. Therefore, this wheelchair is more comfortable and safer for people with physically disability and also provides automatic protection.

Technical Details of Final Deliverable

The microphone is used to convert from user voice commands to electrical signals. These electrical signals are sent to the voice module. B. Voice Module consists of voice recognition module and voice capture module. The voice commands given by the user are inputted and recorded in the voice recognition module, whereas the voice capture module is used to recognize the voice commands by comparing the voice commands from the user to the recorded voice commands. There is no special requirement for languages of voice module. Basically, it can be any languages such as English, Thai or any native dialect. However, pronunciation when training the system should be close to the pronunciation in use as much as possible. The voice module takes the input voice commands from the microphone and transfers the results from the voice recognition module to the microcontroller in order to convert the voice commands into motor and electrical actuator understandable instruction to operate the wheelchair as commanded by the user. C. Microcontroller Unit The Arduino Uno R3 is utilized as a main processing unit of the automatic wheelchair. It interfaces the voice module to motor speed control module, ultrasonic sensors and relay modules.It is based on the ATmega328P with a power jack and a USB connection. D. Relay Modules The 4 Channel Relays (10A) with optocoupler module are used as switches to stop and control movement directions of the motors and electrical actuator. There are 6 relay modules used in this work. Each one has a different task to perform. The relay module numbers 1-4 are responsible for motor activation whereas the relay module numbers 5 and 6 are responsible for electrical actuator activation. E. Electrical Actuator The electrical actuator is used to convert electrical energy to the motion of piston. The piston movement is related to the directions of the front wheels of the developed wheelchair. Since the electrical actuator is installed in such a way that is attached to both of the front wheels, it is utilized to manipulate the wheelchair to the left and to the right directions. The operating voltage of the electrical actuator is 12 Volts with the force of 1,000 N. The electrical actuator installed on the developed wheelchair F. DC Motors Two DC motors are 6 employed for the motion of the wheelchair. One DC motor is attached to the left rear wheel and the other one is connected to right rear wheel. The operating voltage and power are 24 Volts and 350 watts, respectivel

Final Deliverable of the Project

HW/SW integrated system

Core Industry

Health

Other Industries

Medical

Core Technology

Internet of Things (IoT)

Other Technologies

Robotics

Sustainable Development Goals

Good Health and Well-Being for People, Quality Education

Required Resources

If you need this project, please contact me on contact@adikhanofficial.com