(2026-02-09, 08:03 PM)Slovak Wrote: The specs for the MacArthur HAT power supply indicate input voltage of 5.3 - 50V. Our boat is 24V (nominal), so there should be no problem with the HAT, despite all references being to 12V supply?
Does the "12V SW" referenced in the documentation actually require 12V, or can it be the same as the 24V to the HAT power supply?
While the Pololu power module itself can handle 24V, the MacArthur HAT is only designed for 12V operation. There is over-voltage protection circuit on the MacArthur HAT between the 12V connector and the power module, which will trigger if connected to a 24V system. Best case the resettable fuse will trip, wort-case you may blow out the 14V TVS Diode D1.
(2026-01-29, 10:02 PM)aitonos Wrote: Why the Mac Arthur is just troublesome in this Pi5?
From what I know, there are many people operating the MacArthur HAT with a Pi 5.
If you even have problems when running from a USB supply, make sure that the USB supply is properly sized for the Pi5. Ideally, using Raspberry Pi's official USB power supply.
Another possible problem could be heat. The Pi5 produces quite a bit more than the Pi 4. Stacking a HAT will negatively impact air flow. The official active cooler may mitigate that problem.