I have a small touchscreen hooked up to a Raspberry Pi, powered by (and getting ethernet connectivity from) a 802.11af splitter. Everything basically works.
Sometimes when I first walk up to the (capacitive) touchscreen, it behaves oddly – phantom touches, a bit of a 'static-y' feel as my finger gets close to the screen, etc. It usually goes way if I touch the screen (even the edge) and leave my finger there for a few seconds. I'm wondering if it could be caused by a grounding issue.
Should I be connecting the ground on my Pi to the in-wall conduit in addition to the ground wire coming from the POE splitter? Or would that just cause more problems?