Helge thanked Radek Kaczorek in topic Astroberry Server 1 week ago
Helge replied to the topic 'Connect stepper driver via USB' in the forum. 2 weeks ago

In which case I consider myself lucky - since I already ordered one of those...

Thanks a lot anyway!

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Helge replied to the topic 'Connect stepper driver via USB' in the forum. 2 weeks ago

Hm...but this one seems to be designed to do the job:

www.pololu.com/product/3131

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Helge replied to the topic 'Connect stepper driver via USB' in the forum. 2 weeks ago

Hi Wolfi,

Many thanks. I guess, what you are saying about he 64 Byte chunks is the reason for the „latency“, described in the article. Regarding pulse messages, what does it mean for the focuser? If, just for the example, I want to move the focuser by three steps forth, and then five steps backs (in the course of focusing), does it mean it will not work? What is actually a pulse message, technically speaking?

Best, Helge

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Helge replied to the topic 'Connect stepper driver via USB' in the forum. 2 weeks ago

Thanks for sharing the article, really helpful for my understanding!

However, still, with the astroberry focuser I do not encounter any of the potential issues (latency, interrupt handling) as described in the article (here in my set up the Raspberry GPIOs drive the A4988 Pololu stepper controller). I guess, it is a matter how complex the programs running on the Pi (in parallel) are?

I have ordered in the meantime the Tic T825 Controller and give it a try...something to keep myself busy as autumn and clouds finally arrived!

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Helge created a new topic ' Connect stepper driver via USB' in the forum. 2 weeks ago

I wonder about the following:

For some time, I have my stepper motor controller (A4988) connected to the Raspberry Pi‘s GPIOs and leverage on the great astroberry-diy library (astroberry focuser).

Alternatively, one could use an Arduino, connected via usb, to connect to the driver, e.g. Pololu A4988. See for instance:

hansastro.github.io/Focuser/

But why putting an Arduino in-between? I have seen, that on the Pololu website there is also a stepper controller that can be connected directly to USB, see www.pololu.com/docs/0J71/all

So, in theory (unfortunately I am lacking of the programming skill), wouldn’t it be possible to address the stepper controller via usb?

www.pololu.com/docs/0J71/12.1

Just thinking it would need a driver like the Astroberry drivers that enables to connect the the stepper driver via usb.

Why of interest - it would allow using mini pc‘s with usb 3.0 instead of the Raspberry Pi - and without the need of an Arduino.

Any views?

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Helge created a new topic ' Ideal stepper motor' in the forum. 4 weeks ago

I am in the process of attaching / trying out a new stepper motor to the scope. It is a nema17, with a gearbox 1:14. Should I use microstepping, like 1:2 or ... 1:16? I tend to think that a high resolution is useful in principle to allow precise, minimal movements, at the same time it is slowing down any movements, and also the torque (due to microstepping).

Any views out there on the ideal gear ratio and resolution?

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Helge replied to the topic 'New operating system for the project "Astronomy Linux"' in the forum. 1 month ago

Dear Oleg,

This looks very impressive, but if I may ask, what is the advantage to the users to have a dedicated OS? Is it for instance slimmer and faster, or has any additional features?

Apologies for asking, my knowledge about OSs is certainly not advanced.

Best, Helge

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Helge replied to the topic 'What happens to guiding when main camera image is downloading?' in the forum. 2 months ago

Funny you are bringing this up - this is something I observed last night...

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Helge replied to the topic 'Using KStars/Ekos with just computer' in the forum. 2 months ago

Hi Doug,

You can run on your machine or laptop windows and Linux OS in parallel (dual boot). Works pretty good.

Best, Helge

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Helge replied to the topic 'Right settings for ASI 183 MC Pro in INDI' in the forum. 2 months ago

I never tried RGB24. See picture for my settings, except that I now apply for gain = 180 and set antidew=1. In PixInsight I debayer with RGGB, no problems.

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Helge replied to the topic 'Right settings for ASI 183 MC Pro in INDI' in the forum. 2 months ago

Hi Amin,

I am sorry to hear about your problems. I can only share my experience with the ASI071, where I also encountered ampglow issues. The reason was the USB 2.0 interface of the Raspberry Pi. With the ASI071PRO, issue resolved, as the new version is buffering the data.

In case you also use USB 2.0, try to connect directly to a laptop or pc with USB 3.0.

Hope this helps.

Best, Helge

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Helge replied to the topic 'About Kstar & Ekos at ARM 64 (RK 3399)' in the forum. 2 months ago

on the ZWO ASI120 - were you saying the cam works with PHD2, but not for KStars/Ekos?

otherwise, if it is also not working with PHD2, I would put my order on hold.

thanks a lot, Helge

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Helge replied to the topic 'NanoPi M4' in the forum. 2 months ago

This is good news, hope to receive the M4 the next few days.

On X11vnc, can you tell more what you needed to do to get going? (If you remember)

Best. Helge

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Helge thanked Takito Nagai in topic NanoPi M4 2 months ago
Helge replied to the topic 'Shoestring USB-serial with StellarMate' in the forum. 2 months ago

Actually I have not tried the cable, but can report that the BT adapter works reasonably well, at least in my case.

If I may ask - what exactly is not working?

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Helge replied to the topic 'subpixel accuracy - autoguiding' in the forum. 2 months ago

Think, now I got it: if rms = 1” arc sec, it is very roughly a quarter of my arc sec per pix!

B)

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Helge replied to the topic 'subpixel accuracy - autoguiding' in the forum. 2 months ago

Hi Wim,

Is this correct for ASI120 with 3,75my:

= 206 x 3,75 / 170mm focal lenght
= 4,54”

Means: with an RMS equaling 1, I will have on average a shift of 4,54” ? Somehow sounds a lot, or am I wrong?

So I would be better off with a scope with a longer focal length?

In case you can recommend some sort of literature, would be great if you can share a link.

Thanks once again, Helge

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