The AP bug bit again last November. Last time was at the turn of the century. Life got in the way and I sold almost all my astro gear. Started assembling an AP rig in December (nothing in stock!) and finally started imaging the middle of January. Still getting up to speed on the mountain of new software, but I'm having a blast.
Anywho, now that I'm getting comfortable with what I have I would like to try out a Raspberry Pi. They look like fun. Where did you get yours? I see them listed in a lot of places. The RPi 4 8gb ram with 32gb SD card and power supply run about $110. Cheap enough for me to try. Other than that the only other question is do you have any heat issues? I see that the kits come with either heat sinks or fans+heatsinks.
As far as the mini PC goes I see from my searches that the Beelink U55 seems to be a popular choice. Does the U57 draw that much more power? They both use a 3A power supply. It's an i5 so that will draw a little more power, but is it significant?
I'm looking for ways to untether the rig from my laptop. Right now it's connected by an active 32' long USB 3 cable. Fairly reliable when plugged into the USB 3 port on my laptop. Rock solid when plugged into the USB 2 port. The ASI120MC-S is only running at USB 2 speed then, but who takes images of planets with a 30mm guide scope? Not me. :-)
I would like to be able to polar align, select a target, plate solve, and acquire images. I will process the images on another computer. I'll probably need help with the RPi. The mini PC will be a piece of cake. I've been using Windows since version 3.1.