A multi-controlled semi-autonomous wheelchair for old and physically challenged people

Physical disability has been incessant thinking for the past several eras. Wheelchairs are the sift partner for most of the disabled people in their day-to-day life. In order to collaborate with physically disabled people, a multi-controlled semiautonomous wheelchair is developed in this paper which can carry them prudently without the assistance of any other human caretaker. The disabled people can navigate and control the speed of the wheelchair by joystick, voice command or gesture command. The system can detect the obstacle in the front side and back side of the wheelchair and can stop the movement automatically to avoid collation. It can also detect any hole when it is moving in the font direction and stops the movement to protect the disabled person from an accident. In case of an accident if wheelchair tilted extensively from its normal orientation the system automatically stops the motors, sends SMS to the relative with GPS location and sounds the buzzer to draw the attention from others. The evaluation of the performance of the system shows that it can be a very helpful friend in the daily life of physically challenged people.