Anti-Collision and Anti-Mired Wheelchair Prototype

DC Motorized wheelchairs have been developed in past few years to facilitate its users with convenience and ease. However, only few researches focusing on wheelchairs automatic breaking system through speed reduction. Some of users have slow response in controlling the motorized wheelchair hence possibility to collide or to fall down is high. This research is focusing on the implementation of speed reduction method in DC motorized wheelchair to prevent collisions and also to protect the wheelchair and user from falling down. The system implanted on the control system will automatically reduce or stop the motion of the wheelchair when it detects turns or a sharp drop such as stairway. The implanted system used ultrasonic sensors to detect the presence of a barrier or a sharp drop. Eight sensors are implanted on the front and rear side of a wheelchair. When the sensors detect a presence of a barrier in 1 meter distance, speed will be reduced to 50% and when the distance is 30 cm, velocity will drop to zero. To prevent from falling down, the speed will be reduced to zero when it detects a drop more than 2 cm deep. The system has been tested and it works properly as required.