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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?

James S. Albinson
 

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.


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

Khalid Baheyeldin
 

I tried the Android App the same way that you did and got the same result: the RA address displayed (11h 31.9m) is not the same as what I entered (040052).
And the Android app does not allow me to enter spaces between the hours minutes and seconds, nor does it allow a period or a comma. Those are the only special characters on the numeric only keypad that pops up. I think this may be one source of the problem you are seeing.

I have never tried manually entering coordinates before, so don't know if this is how they should be, or was changed recently or what.

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.


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

Ivan Cohen
 

Rafael,
last night I tried what you said, precisely with vega. First goto was very approximative. Then hopping from on star to the next was way off, although going somehow in the right direction, but far from the right position. Polar align was ok. Next time I will check if error is only on RA or if DEC is also off.
Thx!!!


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

Ivan Cohen
 

And a last point: in the main screen of onstep app on android, even when tracking is on at sidereal rate the RA coordinate keeps on changing at about 1x speed


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

Ivan Cohen
 

the images that did not go through:



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

Ivan Cohen
 

1/Turn on the MaxPCB2

2/Connect from android phone

3/"Home (Reset)"

4/Start tracking (Sidereal Rate)

5/Check coordinates (in my case RA 04h00m52s, DEC 89°59'06")



6/"Enter Coordinates", enter the current coordinates



7/Press OK. In this exemple I don't understand where the RA=11h31.9m come from



8/Press Goto. The DEC axis is stil, that's ok. The RA moves by almost 2h in this example.


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

Ivan Cohen
 

The mount: 


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

Ivan Cohen
 

The hardware and config:


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

Rafael Barberá Córdoba
 

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”


Re: Wireless SmartHandController (ESP32 - SPP bluetooth)

Gildo Bosi
 

The ESP 32 of the smarthandcontroller is unable to communicate with the HC05 type module. It is necessary to replace the HC05 module with the SH-H3 (bluetooth module).
Gildo


Re: new FYSETC S6 build

Howard Dutton
 

On Fri, Jul 31, 2020 at 06:57 AM, Markus Kempf wrote:
BTW what would be the best setting of the baud rates for fastest initial connect to the wemos d1. 9600 and wait for the negotiated Speedup or 57600 (115200)?
I often set all rates involved to 115200 (OnStep and both WiFi Addon rates.)

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