This proyect allow to create a cheap trackballl mouse starting from a conventional optical Mouse. A Trackball mouse allow people with hand/arm movement problems to control a computer.
It is very important for the function of the trackball mouse that the center of the mouse's laser should touch (or be very near) to the ball.
You will need to download this software (http://hp.vector.co.jp/authors/VA026826/ ) in order to reverse the direction of the mouse.Also it is recommended slow down the mouse speed.
This object was made for the "Mutual de Seguridad C.Ch.C" from Chile. In a project of the Direction of innovation and development, and the Neuro rehabilitation institute.