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ABSTRACT

Wheelchairs are a way of reincarnating the purpose of life in the lives of disabled people. Instead of using joystick controlled wheelchair we can embedded a wheelchair with magicglove.In this seminar project presentation topics we designed a cost-effective wheelchair for the person who having major disabilities. The user wearing an instrumented glove embedded with flex sensor for controlling the movement and direction of the wheelchair. RF wireless communication exists between the glove and controller which is sandwiched between user seat and wheels. Here we also includes obstacle sensor it perform that if any object is detected in the path, it will halt the operation. Therefore the wheelchair comes to be in standstill.

 Keywords— Flex sensor,Microcontroller,Obstacle sensor.

INTRODUCTION

Most of the people worldwide, with physical disabilities require the assistance of a wheelchair but only a small percentage of them actually own or have the liberty of buying one. Although manual wheelchairs have proven to be beneficial for the disabled but it has only served the purpose of people with minor disabilities. Consider for a moment, a person suffering from partial tetraplegia or sclerosis. It becomes extremely difficult for such a person to maneuver the chair, even within the confines of a house. Such a person would require the assistance of other people, even to carry out his daily chores. Another alternative would be an electric wheelchair controlled by a joystick.

Although the electric powered wheelchair is a much improvised vehicle and an easier-to-control device, but it might not help the cause of severely disabled. Common experience shows that a joystick requires a relatively large force which is more than the threshold for severely disabled people. Taking into consideration, the force and the whopping cost of wheelchairs available in the market, this paper describes the design of a cost-effective and easier-to-control wheelchair.

The paper presentation topics presents a control-method to maneuver a motorized wheelchair merely by the movement of fingers. It aims at incorporating the modern ways of wheel chair dynamics and control and at the same time making it cost effective, so that it is affordable to the common masses. The goal of this research is to develop a wheelchair system which controls its movement by the mere bending of a person’s fingers. Special type of sensors known as ‘flex-sensors’ are embedded into a hand glove in order to achieve the desired goal. In this research a prototype of an affordable and technologically advanced wheelchair is to be designed and developed. This is to aid the communication of severely disabled people and enhance the maneuvering of the vehicle with the use of hand movements. The proposed prototype will be communicating wirelessly between the controller and the plant and it will also replace the traditional joystick by the Implementation of user hand glove control.

BLOCK DIAGRAM

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Block Diagram

The block diagram representing the complete system.  It consists of flex sensor circuit, microcontroller, wireless transmitter and receiver combo, motor drive circuit and motors. The bending of the flex-sensors attached to the hand-glove initiates the process. From the block diagram, we assigned the fingers as the input.  From that we given the input by bending the index finger, the LCD displays move forward and the RF transmitter transmits the signal to RF receiver.  As same way, all other fingers have the specific task to perform. As the fingers are bent and hence the flex sensors, a voltage is developed across the constructed flex sensor circuit.

Hand glove flex sensor is function by varying the voltage levels to intimate the task to do. Already we seen each finger has the separate task, by varying the voltage of one finger it gives instruction to ADC circuit. From ADC circuit, it transfers the analog signal to digital signal to microcontroller.  From microcontroller, it passes the message to LCD and Encoder. This encodes the obtained information and sends this information to the RF transmitter through RF transmission medium. RF transmitter sends the message to RF receiver to perform the task.

RF receiver sends the message to the microcontroller on the wheel chair side. The RF receiver receives the transmitted message it sends to decoder.  After that the received information is decoded into original message and send as an input to microcontroller. This controller sends this to wheel chair by using the stepper motor drive to perform. Hence, the wheel chair performs the task by giving the input of hand glove flex sensor of using embedded microcontroller.  Apart from the above process the microcontroller checks the status of the obstacle sensor if any detected it stops and alert the person.

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JJ

This is Mr.Jose John, 21 yrs old guy, currently pursuing final year mechanical engineering, now become an enthusiastic blogger and a successful entrepreneur.
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