2026-01-08, 08:16 PM
Interesting observations.
Instinctively, for EMI I would have blamed the power module first, as that's the only component doing serious switching work. But it looks like that's fine in your setup.
Seatalk1 is rather slow and low current. And with the 10K resistors between GND and ST DATA and 12V SW, I also don't see much potential for ground loops.
Did you check for wiring that may obstruct the WiFi antenna of the Pi?
Are you powering the Pi from 5V via USB or 12V via MacArthur HAT?
Instinctively, for EMI I would have blamed the power module first, as that's the only component doing serious switching work. But it looks like that's fine in your setup.
Seatalk1 is rather slow and low current. And with the 10K resistors between GND and ST DATA and 12V SW, I also don't see much potential for ground loops.
Did you check for wiring that may obstruct the WiFi antenna of the Pi?
Are you powering the Pi from 5V via USB or 12V via MacArthur HAT?