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Re: From scrap metal to mount #celestron

Khalid Baheyeldin
 

Nice project!
It is in the showcase page now.


Re: Book about arduino programming?

Khalid Baheyeldin
 

On Fri, Jul 31, 2020 at 03:52 PM, <jsalbinson@...> wrote:
I'd like to understand a lot more about OnStep:
are there any recommended books on arduino programming,
particularly about classes and the more advanced nuances of the subject
that are used here.
If you know C and C++, then Arduino is just another API to program for.
If you don't know C++, and its object oriented programming (OOP), then
there are many tutorials for that on Youtube and the web. Start with those
and play with some examples until you 'get' how classes and objects work.
The rest is straightforward ...


Re: From scrap metal to mount #celestron

Mike Ahner
 

That's really great! You're friend did a very good job it seems, especially since the mount was non-functional.

I like these kinds of projects that salvage items and restore the usefulness. For many people it's hard for them to see the hidden valley in broken items like this & even if they see it, people often don't have the skills or patience for such a project. You're very fortunate to have such a good, skillful friend!

I hope you have many, many enjoyable hours under the stars.


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Mike Ahner
 

Congratulations Ivan! Good job!

Testing inside is very useful, it's so much easier to find loose pulleys and other mechanical or technical issues with lights, tools, a/c or heat and coffee or tea handy. (And depending on where you live, mosquito free) You can load up your mount with telescope and all your accessories & as you said, verify easily the cables don't snag and clearances are sufficient. Nothing like having a cable snag in the dark & pulling something off the mount, especially when Mars is getting close to the tree line & you just want one last look.

And you can test all your connections for phone or computers, etc. and easily update drivers or work out a checklist setup procedure. Where I observe is 100 miles (160 km) from my home and I don't even have cell service out there yet. So if I have any issues with software, I'm out of luck.

I see I didn't proofread my message very well last night but you understood my thoughts anyway. Small setting circles like on most mounts are not very precise for finding dim objects, but they do have some uses especially for testing or just occasional verification as you learned. I've corrected the erroneous sentence below, just in case someone else reads and doesn't quite understand me.
 
look at your setting circles. Those are not precise but they should be should the approximate same values as the coordinates of the star you selected.
Now, I hope you have clear skies coming your way!


Re: Cannot connect Sky Planetarium to OnStep through ASCOM OnCue

BJ Ranson
 

I had earlier tried uninstalling and reinstalling both the ASCOM platform and driver.

Anyway, my suspicion that there was some kind of corrupted state in the Windows 10 installation turned out to be true, as I performed a full reset of the OS, and after reinstalling all needed components, I was able to get Sky Planetarium to connect to OnStep via the ASCOM Generic Hub. I was also able to connect using the USB->COM port for the first time, instead of over IP, which is good news as I want to control the PC via Remote Desktop from the comfort of my warm office instead of freezing to death come the autumn.

So it was a rather drastic fix, which probably didn't help you in terms of diagnosing connection errors, but it's a story to add, in terms of some peculiar and rather non-specific corruption occurring within the OS causing issues.

Thanks again for your help.


From scrap metal to mount #celestron

tjoeki@...
 

Hi all

first of all thank you Howard for your efforts. 

also to all others I see here across the boards giving advice sharing knowledge. What good is knowledge if you don’t share it.

i want to give special thanks to a friend of mine who, like you guys, is gifted with technical skills a brilliant mind and perseverance.

because of personal problems I had to sell my equipement a couple years back. All that remained was a CGEM, shorted control board crappy DC motors and a tolerance  in its gears, it look more on a shakerdeck from Parker Schnabel then a mount.
it was its weight worth in aluminum. 


but Patrick my friend likes a challenge. So after spending €100,- in parts and stepper motors, a begin was made. a lot of time invested by Patrick his agreeable spous, the result is awesome. 

the setup is a CGEM OnStep KD mount. (Kastelijns-Dutton 🤓) 


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Ivan Cohen
 

Thank you all for your many advices!

Things seem to get clear at working better.

I used the RA and DEC marked wheels to test the mount indoor and hopped from one star or messier to the next. I figured out several issues:
1/the RA pulley had come loose (no idea how I let it loose). So that explains why the telescope was far off.
2/I somehow got confused with the coordinates on the planetarium. Switched from ALT/AZ to DEC/RA. Every motion became obvious. I could test meridian flip.

Conclusions: testing indoor is very useful. I got confused because of RA pulley being slippery combined with meridian flip (so values did not match a +/-12h).

So I understood a lot of things, and on the side why people say Howard is always right.

I will test more, especially the limits to avoid axis motors collision.


Re: DS18B20 therm sensor and MKS Gen-l 2.0

Howard Dutton
 

Also, I hear users struggling with parasitic power mode on DS18B20's so I'd wire to bring power to them.

Note the DS2413 (dual GPIO) has no provision for bringing power to them and they work fine.


Re: DS18B20 therm sensor and MKS Gen-l 2.0

Howard Dutton
 

No idea what the problem is here but the code definitely works and works on the Mega2560.  I tested with a Mega2560/RAMPS1.4 if using a MKS Gen-L be sure you pick a pin for 1-Wire that has no extra filtering circuitry (no end-stops.)

Here's the logging output (#define FEATURE_LIST_DS ON) and the result of an :Ft# command to get the focuser temperature.

06:45:23.865 -> DS18B20: 0x286488AD080000E5 auto-assigned to TELESCOPE_TEMPERATURE
06:45:23.932 -> DS18B20: 0x28F2B7AB08000004 auto-assigned to FEATURE1_TEMP
06:45:24.000 -> DS18B20: 0x28B571AD08000043 not assigned
06:45:24.033 -> DS2413:  0x3AD836460000000B auto-assigned to FEATURE1_PIN
06:55:45.581 -> 23.3#


DS18B20 therm sensor and MKS Gen-l 2.0

Arturo Merchán
 

I am trying to connect a DS18B20 temperature sensor to the MKS Gen-l 2.0. I have studied in pinmap of the ramps14, which this board refers, and I have not found defined in pin for "OneWirePin". I have tried several free pins but I can't get the actual reading (-137ºC).
If someone has used this chip with this board, can you advise me?
Thaks!


Re: Book about arduino programming?

John Petterson
 

On 7/31/2020 2:52 PM, jsalbinson@... wrote:
I'd like to understand a lot more about OnStep:
are there any recommended books on arduino programming,
particularly about classes and the more advanced nuances of the subject
that are used here.
Thanks, James Albinson


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Mike Ahner
 

On Fri, Jul 31, 2020 at 06:42 PM, Khalid Baheyeldin wrote:
You can still test indoors and see if the mount is pointing in the general area of the object. For example you can point to stars that are at azimuth 90 and 270, and see that the mount is actually at 90 degrees to the north/south axis. Similarly, you can point to a start that is 45 degrees in altitude and see that the mount is roughly pointing that way.
Ivan, as Khalid writes, you can do most of your testing and troubleshooting inside. Your mount has setting circles which you can use to verify your gotos even while inside and during daylight & without a telescope.

Setup your mount in the Home position, so turn your setting circles to match that: RA should read 0 hours 0 mins, DEC should be set to 90 degrees.
Power on OnStep, follow the location/date/time procedures and start the 3 star alignment.

If you can choose Vega for example, your mount will slew to RA 18h37m DEC +38d48m (approximately). You know the mount is moving the correct direction, I think, so now when the slew ends, look at your setting circles. Those are precise but they should should the approximate same values as the coordinates of the star you selected.

You don't even have to try to center the "star" since there isn't one. Just accept the position with the sync button on the Android app (don't forget to hold it down until it responds). Then you're ready to choose the 2nd star in your alignment process.

If you choose say, Altair, your mount will slew to RA 19h 51m DEC +8d 55m and your setting circles should be very close to those numbers. If you are using something like Stellarium you can verify the end of slew values match the star's coordinates and these should be close (not precisely but very close) to your setting circles.

We often overlook the setting circles because it's very difficult to get enough precision out of the small ones on most mounts to find dim objects. But they do work on a coarser scale and for verifying mount slews, they're very good indeed. They also help verify correct direction of slewing on a new OnStep conversion.

I had a problem with OnStep with my mount moving only half far enough. It turned out to be my stepper drivers were wrong versions & weren't configured for SPI microstepping control so not only did the mount stop short, but when I did test it on the sky, it wouldn't track properly either.

Good luck!
-Mike


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Khalid Baheyeldin
 

You can still test indoors and see if the mount is pointing in the general area of the object. For example you can point to stars that are at azimuth 90 and 270, and see that the mount is actually at 90 degrees to the north/south axis. Similarly, you can point to a start that is 45 degrees in altitude and see that the mount is roughly pointing that way.

The more testing you do inside, the less surprises you get under the stars.

The above tests would rule out certain errors like: wrong inputs in the spreadsheet, microsteps is half what it should, or steps per degree is double what it should, and so on ...

The "start Tracking, then slew to a star" is only a rough start. Once you are confident that the mount is pointing in the right general area, you should follow what Rafael said and do a 3 star align, centering and syncing each one. Gotos become accurate after you do that.

Another thing to check is what is our overhead limit? You can set that on


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Ivan Cohen
 

Khalid,
I followed your steps and things are ok on the planetarium and android app. I could not test in the sky yet because we have occasional rain tonight. Last night I could not find Dubhe with goto (tried vega and deneb, same result: very far), but I definitely have to do it again in the exact sequence you mention.

Rafael,
I will try 3 star alignment asap.

Thx!!!


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Rafael Barberá Córdoba
 

If you haven’t performed a 3 stars alignment, don’t expect very precise gotos. Only after a 3 stars alignment, OnStep will be able to compensate to the most usual alignment/building errors. Before that the only thing that OnStep has is a model for a “perfect build mount, perfectly aligned” that’s usually not the real scenario. 


Re: FYSETC F6

Khalid Baheyeldin
 

The F6 does not work.

The S6 however, does work.


FYSETC F6

Don Parish
 

Has anyone tried the FYSETC F6 board  Arduino 2560-R3 compatible (works with Sprinter, Repetier-Firmware, Marlin out of the box . i have on that why i ask. 

The Arduino installer has been up dated for the f6 in the boards. so if in install onstep what would it take to get it going?


 https://wiki.fysetc.com/F6_V1.3/#step2-fysetc-arduino-plugin


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Khalid Baheyeldin
 

On Fri, Jul 31, 2020 at 03:49 PM, Khalid Baheyeldin wrote:
Ivan,
Instead of doing it that way, please do the following:
- Go to Observing Sites, press Use Current, then press Upload. Make sure you get a confirmation message.
- Go to Initialize, then press Set Date/Time. Make sure you get a confirmation message.
- Go to Tracking, enable tracking.
- Go to Bright Stars, then select Dubhe, then Goto. See if you end up on the correct star.
Let us know at the end of this test:
- What RA and DEC you end up with on the planetarium and in the Android App (press the "i" icon if needed).
- Whether the scope seems to point to the right part of the sky, or is way off (in both RA and DEC).


Book about arduino programming?

jsalbinson@...
 

I'd like to understand a lot more about OnStep:
are there any recommended books on arduino programming,
particularly about classes and the more advanced nuances of the subject
that are used here.
Thanks, James Albinson


Re: Backlash on Super Polaris with direct coupling of planetary gearbox? #backlash

Howard Dutton
 

On Fri, Jul 31, 2020 at 12:06 PM, Rafael Barberá Córdoba wrote:
Around NPC the RA values could be misleading, because they jump around for few degrees around NPC. Don’t look at the RA to close to the NPC. Goto Vega and then form there to another nearby stars and look at the RA figures on this goto. They should be “normal”
Exactly, I see nothing wrong here.  Ivan is expecting coordinate handling is more simplistic than it is.