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Warning: Question on periodic error that is non-Onstep specific
Something odd here is the difference between the shape of one side vs. the other. The top part is what one would expect from a periodic sine wave: it is gradual, hence rounded. But look at the bottom
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Something odd here is the difference between the shape of one side vs. the other. The top part is what one would expect from a periodic sine wave: it is gradual, hence rounded. But look at the bottom
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By
Khalid Baheyeldin
· #14722
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Microsteps slewing with ramps1.4 A4988
No. They are the alt and azimuth coordinates of an object. OnStep translates those sky coordinates into motor steps based on motor and driver parameters, ...etc. The use of Alt and Az in this test avo
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No. They are the alt and azimuth coordinates of an object. OnStep translates those sky coordinates into motor steps based on motor and driver parameters, ...etc. The use of Alt and Az in this test avo
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By
Khalid Baheyeldin
· #14718
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A question about SS2k on GP-DX mount
This is not an OnStep question, but I used to have that same mount. So, I will answer this in a private message.
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This is not an OnStep question, but I used to have that same mount. So, I will answer this in a private message.
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By
Khalid Baheyeldin
· #14714
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STM32 Bluepill Kit - No I2C devices found
Looking at the commit log for Arduino_STM32, there are indeed a lot of changes for I2C. That may explain (at least partially) some of the issues where the STM32 would not communicate with the EEPROM.
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Looking at the commit log for Arduino_STM32, there are indeed a lot of changes for I2C. That may explain (at least partially) some of the issues where the STM32 would not communicate with the EEPROM.
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By
Khalid Baheyeldin
· #14712
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The TMC2209
I added a comment about the TMC2209 versions here https://onstep.groups.io/g/main/wiki/StepStick-Driver-Summary Also a general comment on what models are recommended. One disadvantage currently in OnS
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I added a comment about the TMC2209 versions here https://onstep.groups.io/g/main/wiki/StepStick-Driver-Summary Also a general comment on what models are recommended. One disadvantage currently in OnS
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By
Khalid Baheyeldin
· #14701
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Onstep and celesctron CGEM
When it goes under the stars, first thing to test is to go from one star to another far away (10 degrees or more in each axis), then check if the slew is accurate or that resonance caused some missed
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When it goes under the stars, first thing to test is to go from one star to another far away (10 degrees or more in each axis), then check if the slew is accurate or that resonance caused some missed
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By
Khalid Baheyeldin
· #14691
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Comet tracking.
That is great info. Let us know how it goes ...
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That is great info. Let us know how it goes ...
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By
Khalid Baheyeldin
· #14687
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Onstep and celesctron CGEM
I had the same symptom. OnStep accelerates with increasing speeds when slewing, and decelerates at the end of the slew. It does that over a certain number of degrees. If you hear the different speeds
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I had the same symptom. OnStep accelerates with increasing speeds when slewing, and decelerates at the end of the slew. It does that over a certain number of degrees. If you hear the different speeds
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By
Khalid Baheyeldin
· #14686
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Unable to start OnStep
We have about ~ 200 users with STM32 controllers and OnStep. Unless you want to use something that adds a feature that is not already there, it is not productive to try different libraries. Rather, it
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We have about ~ 200 users with STM32 controllers and OnStep. Unless you want to use something that adds a feature that is not already there, it is not productive to try different libraries. Rather, it
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By
Khalid Baheyeldin
· #14685
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The TMC2209
Although the official Trinamic TMC2209 documentation lists microstepping as 1/8, to 1/64, the BigTree Tech TMC2209 from AliExpress, and the V1.1 on eBay, both say it is 1/2, to 1/16. OnStep uses the f
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Although the official Trinamic TMC2209 documentation lists microstepping as 1/8, to 1/64, the BigTree Tech TMC2209 from AliExpress, and the V1.1 on eBay, both say it is 1/2, to 1/16. OnStep uses the f
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By
Khalid Baheyeldin
· #14683
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Onstep and celesctron CGEM
Perhaps my mind went to the TMC2208 then. We did discuss the TMC2209, its use of on the fly mode switching (microsteps goto), and it was put in use by members. So, that should be the first thing to tr
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Perhaps my mind went to the TMC2208 then. We did discuss the TMC2209, its use of on the fly mode switching (microsteps goto), and it was put in use by members. So, that should be the first thing to tr
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By
Khalid Baheyeldin
· #14668
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Onstep and celesctron CGEM
The comparison was mainly between LV8729 and TMC2130. The latter misses a step or two when switching microstepping modes (when microsteps goto is enabled). And the former runs much cooler. For his 1.7
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The comparison was mainly between LV8729 and TMC2130. The latter misses a step or two when switching microstepping modes (when microsteps goto is enabled). And the former runs much cooler. For his 1.7
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By
Khalid Baheyeldin
· #14666
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Web Page Formatting
That is one task in a regular session. The other task is 'Return to Home' at the end of the session, which you may not need if you can just disengage the clutches and move it manually.
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That is one task in a regular session. The other task is 'Return to Home' at the end of the session, which you may not need if you can just disengage the clutches and move it manually.
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By
Khalid Baheyeldin
· #14664
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Onstep and celesctron CGEM
These motors are 1.7A. Usually people use the 0.9A variant from OMC (Stepper Online), which have lower heat dissipation, and lower power requirements. But the 1.7A should work still. Don't reduce the
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These motors are 1.7A. Usually people use the 0.9A variant from OMC (Stepper Online), which have lower heat dissipation, and lower power requirements. But the 1.7A should work still. Don't reduce the
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By
Khalid Baheyeldin
· #14661
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Bit OT space X satellites
This article shows photos of how StarLink's satellites interfere with imaging, specially large sky surveys. Even though the trails can be removed programmatically, that process results in data loss.
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This article shows photos of how StarLink's satellites interfere with imaging, specially large sky surveys. Even though the trails can be removed programmatically, that process results in data loss.
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By
Khalid Baheyeldin
· #14653
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Non goto HEQ-5
Plenty of people converted EQ5 type mounts to OnStep. These include CG-5, Vixen Super Polaris and Great Polaris, ...etc. In fact, it is the most popular type that people convert to OnStep. You can fin
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Plenty of people converted EQ5 type mounts to OnStep. These include CG-5, Vixen Super Polaris and Great Polaris, ...etc. In fact, it is the most popular type that people convert to OnStep. You can fin
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By
Khalid Baheyeldin
· #14641
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Microsteps slewing with ramps1.4 A4988
Which is what Pete found out the hard way: after converting a CG-4, and lots of issues, he moved the motors to a CG-5 and all the issues went away. You may want to consider this option down the road.
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Which is what Pete found out the hard way: after converting a CG-4, and lots of issues, he moved the motors to a CG-5 and all the issues went away. You may want to consider this option down the road.
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By
Khalid Baheyeldin
· #14636
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Comet tracking.
When I commented previously on Apparent Motion, I was mistaken on the term. My comment was about Proper Motion, which is known for most stars (measured by specialized sky surveys and satellites). As I
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When I commented previously on Apparent Motion, I was mistaken on the term. My comment was about Proper Motion, which is known for most stars (measured by specialized sky surveys and satellites). As I
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By
Khalid Baheyeldin
· #14626
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Comet tracking.
So it would basically be back to the satellite tracker scheme: an external program calculating pulse guides.
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So it would basically be back to the satellite tracker scheme: an external program calculating pulse guides.
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By
Khalid Baheyeldin
· #14624
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Comet tracking.
From what I understand, comets do not work that way. Apparent motion is basically: n arc seconds per year for RA, and m arc seconds per year for DEC. Comets can move several arc seconds per minute, fo
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From what I understand, comets do not work that way. Apparent motion is basically: n arc seconds per year for RA, and m arc seconds per year for DEC. Comets can move several arc seconds per minute, fo
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By
Khalid Baheyeldin
· #14623
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