I have seen many forum post where they have successfully used usb trackball mouse board to convert happ trackball into usb, but I'm having no luck, On all the diagrams i have of mouse board, the ir reciever three pins have 5v, signal 1 and signal 2, however on the mouse i took apart, i was able to track down 5v and signal 1 pin, but the third pin on my dell mouse is connected to ground, i was able to apply 5v to the signal 1 pin i tracked down and when i connect to computer it makes the pointer go up. Same thing with the second ir reciever. It makes the mouse pointer go to left of the screen. but im unable to find or get the down and right direction to work. Any help would be appreciated.