Soren replied to the topic 'The Mysteries of RPi4' in the forum. 3 days ago

Often when linux becomes unresponsive (even via ssh), it is because memory usage is high and it is constantly swapping. Try turning off swap space, then it may just kill the "offending" application instead of swapping. Running 'swapoff -a' may do the trick (until next reboot I guess).

I have also read somewhere, than the RPI4 can easily overheat, especially in a closed case. If you have a closed case, try running without the top cover to increase heat dissipation.

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Soren replied to the topic 'Focuser backlash?' in the forum. 5 days ago

Thanks for the data. It certainly looks different than the curve shown here:
nighttime-imaging.eu/docs/develop/site/advanced/autofocus/

:-)

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Soren replied to the topic 'Focuser backlash?' in the forum. 6 days ago

If there is a lot of noise, then the first thing I would try was to do a least squares fit of a line to both sides of the v-curve (made with many small steps) and see if the intersection of the two lines matches the optimal fucus. If yes, then make a backward v-curve, do the fitting and see if the step difference between the two focused positions matches the backlash. The backlash should also show up as the shift between the lines of the forward and backward 'linear' v-curves.

Can this be tested with a simulator?
How hard is it to compile ekos? Is it done together with compiling kstars?

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Soren replied to the topic 'Focuser backlash?' in the forum. 6 days ago

Thanks a lot. Could one implement this in ekos, such that it would work for any focuser driver?
I may just need to download the source and see how hard it is to modify and compile.....

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Soren created a new topic ' Focuser backlash?' in the forum. 7 days ago

Hi!

Is it important to have either zero backlash or backlash compensation to get autofocus to work?
Mine have backlash, but fcusb does not seem to have backlash compensation....

Why is backlash compensation not implemented at a higher level than the driver? Seems to be it should be generic to do if one can move the focuser back and forth. And maybe one could also determine the backlash automatically by doing a forward and a backward v-curve?

Thanks for any help!

Best regards
Søren

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Soren replied to the topic 'Wish: Alignment - Slew to Target sync point cleanup.' in the forum. 2 weeks ago

Dear jpaana,

Could you share your eqmod alignment and sync settings? I'm having trouble keeping my allignment working, once ekos starts adding points. It works fine initially for one target, but if I slew far away it will often be way off and sometimes never converge to the target but go-to back and forth jumping over the target....

My problem sounds like something the proposed feature would eliminate.

Clear skies!

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Soren replied to the topic 'Experiences Using SM Beta on RPi 4, 4GB' in the forum. 2 weeks ago

knro wrote: Some reported that if RPI4 is in close proximity with other devices, the WiFi becomes extremely unstable. The kernel + firmware for the rpi4 appears to be in flux still. Next week I should release SM OS v1.4.5 with the latest upstream kernel.. hopefully this would help in making the wifi more stable.


Is it possible to upgrade to 1.4.5 from 1.4.4 using apt or should one flash the new image?

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Soren replied to the topic 'Stellarmate OS as a replacement for Ubuntu?' in the forum. 3 weeks ago

Thanks for the reply. It was not clear to me that 'stellarmate os' is just Ubuntu, maybe it should have been named 'Ubuntu Stellarmate' instead. So I guess the answer to my question is simply 'yes' :-)

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Soren created a new topic ' Stellarmate OS as a replacement for Ubuntu?' in the forum. 3 weeks ago

Hi!

I currently use Ubuntu as the basis-distribution on my RPI to control my observatory. Would it make sense to switch to Stellarmate OS instead of ubuntu, and modify it as needed in my setup? Or would that possibly break something, prevent updates to install and so on... I could see the benefit of having the SM android app available, which I think is not possible on Ubuntu, and no need to mess with setting up a VNC server on a fresh install.

Best Regards,
Søren

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Soren replied to the topic 'Live stacking methods?' in the forum. 4 weeks ago

A 'simpel' levels with histogram is very convenient for adjusting the stacked image.

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Soren replied to the topic 'Scope hitting pier' in the forum. 4 weeks ago

Hello!

Tried again and noticed that the mount model may have been completely wrong, as the slews were nowhere near the target. Of course plate solving would eventually get the mount to the right place.

I purged the mount model and it seemed to work ok for some time. Gotos were quite good initially, but then they seemed to become worse and eventually it would never reach is destination. It would plate solve fine and get a solution, but the corrections done were really small and did almost not move the mount, even though it was 5000" off, and even after 10 solves it had moved almost nowhere. After this I was frozen and gave up for the evening.....

Then I found this:

When using plate solving to refine every slew position it is best to not use the N-Star alignment....

from

indilib.org/devices/mounts/eqmod.html

Could N-star alignment be the thing that seems to
(gradually) ruin my mount model?

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Soren replied to the topic 'Supporting development, buying stellarmate os?' in the forum. 4 weeks ago

Thanks all, you certainly convinced me to get stellarmate os!

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Soren created a new topic ' Supporting development, buying stellarmate is?' in the forum. 1 month ago

Hi!

Just noticed that one can buy stellarmate os. I dont really need it, but I was wondering if buying stellarmate os would actually financially support the development of Indi and kstars? Or is stellarmate os sold by a third party not really affiliated with the development of Indi and kstars?

Best regards
Søren

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