OK I'm trying to hack a fairly old Logitech 3-button mouse to a Happ trackball.
I have read everything I can find to do with this, and although I haven't done everything exactly as others have, I thought I had a reasonable understanding.
My problem is:
I have power to the trackball no problem. I wired 2 of the 3 pins (for the mouse receiver part) to the 2 wires from the trackball which are not power. I THOUGHT the 3rd pin on the receiver was for power (when used in the mouse), therefore have not wired this to anything. I did this for each axis.
Now I determined which pin on the receiver not to use by checking continuity between each pin and power from the PS2 cable (red wire). I may have excluded the wrong pin (?). OR maybe I should have wired all 3 pins up.
When I turn the PC on, the mouse is detected, but the cursor always wants to stay in the top right. When I spin the ball left/right, it flicks over to the left, flashes a bit and then returns to the right. Spinning up/down does nothing (I'm not worried about this yet, I'll try & get 1 axis working first).
I guess what I need to know is: do I need to wire all 3 pins up from the receiver part of the mouse? Or if I only need 2, what is the best way to work out which?
Thanks for any help, I realise my description probably doesn't make sense
