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Happ trackball to two PCBs. How?
SteveR:
--- Quote from: Bravo911 on May 01, 2012, 03:15:57 pm --- Now, should I chain the ground to both boards?
--- End quote ---
From what I understand the ground and power wires on the trackball are merely for providing power _to_ the trackball. So I would try just powering the ball from your primary board leaving the "ground and power" connections on your secondary board empty. Theoretically, you could power the trackball from a 3rd source.
That said, maybe someone else can inform us if the board won't accept the axis inputs without the trackball pulling power from it. I just can't imagine it'd be set up in such a way. Try wiring it up that way manually before ordering a relay to be sure.