Abstract
The electric wheelchair is an effective machine for people with lower limb disability. The user controls the wheelchair by a joystick that helps the user to navigate the wheelchair along the desired path. Suppose the user on the wheelchair wants to operate the computer for his jobs or enjoyment, it is preferable for the user to be able to operate the computer without transferring from the wheelchair to a computer desk. Of course, some computer input devices are available for wheelchairs. One reasonable idea is to use the familiar joystick on the wheelchair as a computer input device. In this paper a joystick controller is proposed, which enables the user on the wheelchair to operate the computer settled on a nearby table. The proposed joystick controller can be achieved by mounting the sensor unit on the joystick without any modification of the conventional wheelchair controller. The principle of the sensing unit is to measure the inclination angle and the direction of the joystick with an acceleration and gyro sensor. Then the sensing unit sends the control data to the computer via an infrared or wireless signal. This proposal is based on a request done by the wheelchair users.
Highlights
For the people with lower limb disability many electric wheelchairs are commercialized and some of them use a joystick controller
An electric wheelchair user who suffers cerebral palsy is shown. Even though his four limbs are paralyzed he can operate the joystick with his chin and enjoy an active life with the help of the wheelchair
The comparison means that these devices have not remarkable differences and that the proposed joystick controller is applicable as a computer input device
Summary
For the people with lower limb disability many electric wheelchairs are commercialized and some of them use a joystick controller These wheelchairs make their daily live independent and active. Even though his four limbs are paralyzed he can operate the joystick with his chin and enjoy an active life with the help of the wheelchair. The acceleration and gyro sensor measures the joystick angle movement and direction, this signal is goes into the microprocessor analog to digital converter which converts the electric input signal to angle and direction After this the microprocessor sends this data to the mouse controller through the infrared port. Where ω is cutoff frequency, ∆t is sampling interval, θacc is data obtained by acceleration sensor, θgyro is data obtained by gyro sensor
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