In this paper, an intelligent low cost wheelchair system is being developed which not only ponder on the mobility of the physically disabled persons, but also to change their daily life. By using this system they can control their home appliances by sitting in the wheelchair without any external remote control. A prototype mobile robot have been designed which is equipped with accelerometer, micro-electro-mechanical based sensor. To solve the problem of safe navigation an assistive obstacle avoidance method based on ultrasonic sensor has been incorporated. Additionally, dual tone multi-frequency signaling used for operating the wheelchair via mobile phone. For implementing hand gesture recognition for the physically challenged people this is a simple but efficient method. Using these gestures, it is possible to control the wheelchair in an efficient way. Besides controlling by a computer, which is a difficult task here all the methods used in this proposed system for controlling the wheelchair are natural and convenient by involving of micro-electromechanical sensors, micro-controllers and the wheelchair for the prototype. Based on the data from either the accelerometer, DTMF or the ultrasonic sensors, the movements of the wheelchair are controlled and this system will be highly efficient as compared to the other conventional methods as because it is not only controls the movement of a wheelchair but also detects the barrier coming in its path and take necessary action to overcome it.

Wheelchair, Accelerometer, Ultrasonic Sensor, RF Data Transmission, Microcontroller

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