In what spot/area... It looks good to me. I ask just so I can improve too. FYI, I have to use my bahtinov mask instead of the focus module. Still use it to adjustment my focus in/out... but the code doesn't like any donuts, it tends to fail.

Edit: Tried again last night. Thought I'd give it a shot. I had a star in pretty good focus, hoping it would move in/out and settle on focus. But instead it focused out till it was a big donut and failed. Go home focuser module, you're drunk!

What is the current status on StellarMate OS support for Raspberry Pi 4?
I just ordered a Pi 4 and I am planning to install StellarMate OS on it, but I won't bother if there are any known issues

I would prefer to use StellarMate OS but if that is not an option I will go for Ubuntu with KStars/Ekos instead (or maybe Astroberry server).

Stellarmate works perfectly fine with the rpi4, and has done for some time now...

@StephanR, I can confirm that SM OS works fine with Pi4, but that's not to say there are no issues for your transition. You haven't listed your current equipment, so I'll just blanket a few thoughts for you to consider. Know that USB3 and wireless 2.4Ghz don't play nicely together on the PI4. That goes for HDMI and at least one high resolution display setting (RF interference). Depending on your equipment and how you plan to communicate with the PI4, you might have to adjust your strategy a bit. If you're not yet using a powered USB3 hub, you'll want that because you shouldn't really use the PI4 USB ports for supplying current. You might get away with using them, but you may find yourself on the margin and regret it when funky power/connectivity issues arise. Your Pi4 power supply will be more crucial (will want to reserve those 15W/3amps for the PI4). You'll want to get an on-board fan and probably heat syncs for the Pi4...they run hot and will auto CPU throttle if they cross a temp threshold. Lastly, purely convenience, you may want an RTC module and/or an SSD for the PI4. Other than these suggestions, you'll likely enjoy the Pi4 performance. It is solid with SM OS.

Thank you for the suggestions.

Yesterday, I also ordered Flirc aluminium heatsink case (without cooler) and SSD.
And I already have a Pi3 so I was planning on using the same power supply (different cable) which is a PowerBank that supplies 5V/3A.
www.avxperten.dk/powerbank/powerbank-300...-deltaco-pb-1069.asp

I have a CEM25P mount so I hope to get the time from the GPS module on the mount, so maybe i dont need the RTC module? Or will that still be necessary?

I also heard about the interference issues so I bought a USB WIFI Dongle with 5 dbi antenna for the Pi and a non-powered USB hub (can supply a maximum of 900 mAh which is enough for camera and guider)
So I was planning to still use the USB ports directly in the Pi (for the USB3 Hub and the SSD harddrive for example). But maybe that is a bad idea?

It’s not about what power the hub can supply, it’s about what power the RPI Can supply to the hub, and it’s certainly not 900ma to each port, you need a powered hub or you may as well Attach everything to the RPI direct as you are not gaining anything at all...

That makes sense.
Actually, the non-powered hub only promises a total of 900 mAh distrubuted on all ports (and I believe that my camera and guider each needs 300mAh).

But if the Pi4 will not be able to supply that to the hub either I will definitely look for a powered hub.
However, I was not able to find a powered USB3 hub that promised Raspberry Pi support on www.amazon.co.uk/ yesterday.
I also need to be able to power it from a 12V outlet on my Powerbox.

I found a lot here on the forum but they were all linking to amazon.com (in the United States) and I have to order from a country within the EU so UK is the best choice at the moment untill end of year.
If I order anything from the US, I will be punished by law with huge fees.

Stephan, don't worry about finding a powered hub that promises Pi4 compatibility. Any 12v powered USB3 hub should work fine. Yes, run a 12v cable from Pegasus to the Hub, and have only the USB data cable going back to the PI4. On your power supply, I assume you'll only use that for the Pi4 (and not other devices too?). If not, you'll want a better supply (5amps or more depending on gear). Cheers, Doug

Thanks for the tip.

I have now ordered this 12V powered USB hub:
www.tp-link.com/us/home-networking/usb-hub/uh700/

I only plan to use my power supply (5V/3A) for powering the Pi4.
And then I have a Lemus Powerbox with 3x 12V DC ports and a 230V EU power socket for the electronic automatic focuser, dew heater and the powered USB Hub.
And I have a jump starter with 1x 12V car cigarette lighter socket (will be used for camera cooling)

Your Li 12V power bank looks very nice thou pricey. I use a classical 7Ah lead Celestron Power Bank at €70 from Amazon.de, very reliable and plenty of energy.

Let us know how it proceeds and thank!

Cheers,
Z

Per getting the time (and position) from your CEM-25P: Yes, this definitely works, and is how I run my RPi4/SM 1.5.2/CEM-25P. It's in KStars | Settings | Configure KStars | INDI | Mount updates KStars if memory serves.

Yes, I also find it pretty pricey but I like that it has 3x 12V output and with the 230V output it is also useful when I go camping with my family.
I believe that the specs of mine are similar to this one from Bresser:
www.astroshop.eu/battery-packs/bresser-m...ion-100-watt/p,63756

I also have a normal cheap powerbank that has 2x USB output with 5V/2.1A each
ongadgets.dk/produkt/powerbank-20000mah-fast-charger-hoco-b31b/

I plan to use that with two converter cables 5V to 12V (Output 12V/0.7A)
www.amazon.co.uk/gp/product/B01ID90K4A/

So hopefully I won't run out of power options