Date   

Re: Onstep total beginner question #EQ3 #bluepill

Francois94
 

Yes , design comes from Frank in that topic : https://onstep.groups.io/g/main/topic/my_skywatcher_150p_on_an/83327227?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,120,83327227
I just made some minor changes to improve stability as the RA mount is only fixed


OnStep driver issues

villem989@...
 

Hello, I bought a second hand Losmandy G11 with OnStep ESP32 goto kit already installed. However I cant get the OnStep to talk with ASCOM / SGP. I feel that Im really stuck so any help would be a great help.

Im running Windows 10 PC with Sequence Generator Pro and ASCOM Platform 6.5SP1. I have installed drivers from here: http://www.stellarjourney.com/index.php?r=site/software_telescope and I have tried latest Beta and all of the older versions avaiable at that page (1.50 and 2.0.6). The device itself is powered correctly with 12v power supply and I have tried multiple USB cables too with no success.

Im unsure what to do next, as Windows doesnt recognize the OnStep controller. In device manager it only shows up as CP2102 USB to UART Bridge Controller with a yellow ! mark. I have tried to run diagnostics too but Windows cant solve the problem on its own and only states that the device doesnt have any drivers.


Re: Cnc V3 and SHC Problems

George Cushing
 

Terry, I'll assume you are using Branch manager ESP32 1.0.4. A couple days ago I started having similar issues with a MaxESP32 I was testing. My experience was with OnStep 4.24g.

The MaxESP32 was configured with a D1 mini Pro, LV8729 drivers and the SHC32 (ESP).

When powered, the ESP32 would not fully boot to OnStep. At least I would get no status 1 LED PPS signal, the SHC would not connect and gave the connection warning - coordinates error. The motors would not operate even though auto on had been selected. The D1 mini Pro did connect with the ESP32. 

I assumed that ESP 32 1.0.4 had become scrambled and removed it and installed Ver. 1.0.6 and flashed one ESP32 with it. Then I reinstalled 1.0.4. The reinstall did not change anything.

A ESP32 with 1.0.6 installed booted, established communication with the SHC, motors were operative, but the D1 mini Pro (flashed with 2.7.4 did not connect with the ESP32. D1 mini flashed with ESP8266 3.0.0 connected. And D1 mini Pro flashed with 3.0.0 prevented the ESP32 from booting. Removing it from the PCB and repowering resulted in a good boot and SHC and motor operation.

There are a couple of more recent revisions to 3.0.0. I'll try them and see what happens. Seems odd that anything would change in the old ESP managers that would stop 1.0.4 from working with 2.7.4.


Re: Adding an optical encoder to a dual shaft stepper motor, does onstep hardware/software support this?

Robert Benward
 

I am struggling with this also.  What happens when you push the scope?  You loose sync.  If you loose sync, then what is the point of using encoders?  Trust that your motors won't skip a step. 

I may take this approach:

https://www.astrodevices.com/shop/index.php?product/page/16/Losmandy+GM8%2FGM11+Encoder+Kit

This couples to the shaft as Ken suggested.  They have them for Dobs as well.

Bob


Re: Steppers with Planetary Gear boxes

Robert Benward
 

Those are Stepper-online part numbers.  Probably the discontinued models or custom made for them.  Stepper-online makes precision planetaries with less than 25 or 15 arcmin backlash depending on gear ratio (4x to 6x better backlash).  With my Losmandy (360 final gear), that would be less than 1/4 of a degree of one worm shaft rotation (1 worm shaft rot=1 deg of mount movement) which is equal to 2.5 arcseconds of telescope movement, assuming a 1:1 pully and no backlash in them and my calculations are correct.  

Under $50 each.
https://www.omc-stepperonline.com/precision-planetary-gearbox/?mfp=184-frame-size-mm[Nema%2017%20(42%20x%2042)],287-gear-ratio[10,15,20]

As George said, what are you building?  Used only for the DEC axis??
Bob


Re: sky planetarium does not connect.. help please

"Guilherme Vênere
 

How are you connecting to OnStep from Sky Planetarium? If it's via IP, you may need to use the persistent port which is 9998, so your connection string (assuming you're using the default IP for OnStep) would be 192.168.0.1:9998 

Guilherme

On Thu, Aug 5, 2021 at 2:36 AM asirio <asirio.x@...> wrote:
Hello friends, I would like someone to give me a hand, since I am about to discontinue the use of sky planetarium.
 
I created my onstep with ramps 1.4, and I connect through a ht06 bluetooth, everything works perfectly in android and stellarium, but when connecting to sky planetarium through the onstep driver, "onstep telescope" is disconnected without further ado, there is no error message or anything, this is the log:

02130223:[Ascom.Telescope] Driver info: On-Step Telescope
02130265:[Ascom.Telescope] Driver description: 4.24g
02130566:[Ascom.Telescope] Connect, Autostar compatible: (On-Step Telescope 4.24g)
02131045:[Ascom.Telescope] Can set Tracking
02131051:[Ascom.Telescope] Can find Home
02131054:[Ascom.Telescope] Can Park
02131057:[Ascom.Telescope] Can Unpark
02131060:[Ascom.Telescope] Can Set Park
02131063:[Ascom.Telescope] Can Sync
02131065:[Ascom.Telescope] Can Slew
02131068:[Ascom.Telescope] Can Pulse Guide
02131258:[Ascom.Telescope] Can Slew Async
02131261:[Ascom.Telescope] Can set Guide Rates
02131301:[Ascom.Telescope] Does refraction
02131337:[Ascom.Telescope] Can Sync. Coordinates
02131708:[Ascom.Telescope] Set latitude/longitude
02131979:[Ascom.Telescope] Set UTC offset: -02
02132369:[Ascom.Telescope] Set date/time: 04/08/2021 21:25:54 UT
02133730:[Ascom.Telescope] OnStep fast reading PEC data
02135670:[Ascom.Telescope] OnStep 160 PEC samples
02137015:[Ascom.Telescope] Disconnect



I can connect in "Device hud telescope" mode, this is the connection log:
 
00719251:[Ascom.Telescope] Driver info: DeviceHub telescope driver. Version: 6.5
00719254:[Ascom.Telescope] Driver description: Device Hub Telescope
00719484:[Ascom.Telescope] Connect, Autostar compatible: (DeviceHub telescope driver. Version: 6.5)
00719529:[Ascom.Telescope] Can set Tracking
00719542:[Ascom.Telescope] Can find Home
00719551:[Ascom.Telescope] Can Park
00719560:[Ascom.Telescope] Can Unpark
00719570:[Ascom.Telescope] Can Set Park
00719579:[Ascom.Telescope] Can Sync
00719584:[Ascom.Telescope] Can Slew
00719589:[Ascom.Telescope] Can Pulse Guide
00719591:[Ascom.Telescope] Can Slew Async
00719591:[Ascom.Telescope] Can set Guide Rates
00719767:[Ascom.Telescope] Does refraction
00719836:[Ascom.Telescope] Can Sync. Coordinates
00720237:[Ascom.Telescope] Set latitude/longitude
00720253:[Ascom.Telescope] Note, setting UTC offset isn't supported.
00720475:[Ascom.Telescope] Set date/time: 05/08/2021 3:02:15 UT
00819847:[Ascom.Telescope] Telescope control thread terminated

 
 but all the options appear deactivated, I cannot align, nor traking, nor disappear, nothing at all.
I don't know what I'm doing wrong, but it's driving me crazy. I did a new installation of win10, since I read that it could be due to corrupted files from win, nothing!
I checked the firmware for options for sky planetarium connections, but I didn't see anything.

I do not have a paid subscription, I read in a topic that the telescope connection worked completely.
 
I hope you can give me a hand, sorry for my "google translator".
Thanks and best regards.


Re: Wemos+CNC shield s109 stepper driver no connection #wemos

George Cushing
 

Just a guess, but the S109s run hot and have a high current output. They may be pulling too much power leaving the ESP8266 without sufficient current to operate properly.


Re: Onstep total beginner question #EQ3 #bluepill

George Cushing
 

Looks good. Your RA drive looks well designed. Are you using a printed motor mount?


Re: Steppers

George Cushing
 

NEMA 17 motors with 1.8° step angle start about $8 on Amazon and Aliexpress ($3 plus $5 postage). Five 0.09° step angle NEMA 17s are starting at $43 shipped or about $7 a unit.


Re: Steppers

Robert Benward
 

Jeff,
Simply take your meter and put it in the "ohms" mode.  It might have the upper case "Omega" symbol instead, but unfortunately symbols are not included in this message service so I can't show you (google it).  Put your meter lead on one motor wire, and then look for continuity on one of the three remaining wires. The one that has continuity is the other end of the winding.  The remaining two wires are the other winding.  Don't worry about the + or - on the windings now.  Now that you have a winding/wire pair identified. 

Now, for low resistance readings, you have compensate for the meter lead resistance.  Short the leads on your meter.  Jiggle or rub the probe tips (or alligator tips) and record the minimum reading.  Now measure the winding.  Again jiggle or rub the motor wire along the probe tip, and hold tightly with your fingers.  Record that reading.  Subtract the shorted lead reading from the winding reading, that is your winding resistance, hopefully within 1/2 or 1/4 of an ohm.

For much higher readings, like 20 ohms and up, you don't need this shorted lead reading.  That shorted reading is only for really low resistance measurements.  Alternately some meters may have a four wire mode, for super accurate low resistance measurements, but that is a lesson for another day.  Most are using their meter to separate out parts, 10 ohms or 100 ohms, 4.2K vs 4.7K, shorted or not shorted, etc.  I have several 6 digit meters around the house.  I cannot tell you the last time I used a 4 wire mode.  Arlen's suggestion is excellent if you don't have a DVM, or even it the meter is not within arms reach.  As he and I have suggested, polarity is not important right now, it can be dealt with later.

Now that you have the winding resistance, you can backtrack to the model you have.  Again, I think most of those models on that page were all below 2A.  The voltage listed is usually given as a data point for the current measurement, but most of those motors will be run at higher voltages, and in fact, the torque graphs show them powered at 24V.  Breakdown voltage at these low levels are of no concern.  As long as you have current control (you do; most modern stepper drivers have it, by potentiometer or by software) you are in good shape.  

If you have a small power supply, you can test your stepper.  Just push 1A through one winding** (use constant current mode) and confirm the holding torque is way up there compared to unpowered .  Do not leave it on for long, it will get hot.  Note that Onstep has a guiding and a slewing current setting.  This is so you do not dissipate power and generate unnecessary torque when not needed during guiding, but the power and torque is there when you slew.

**this is an alternate way of measuring the winding resistance, pump current through the winding and measure the voltage across it, then use Ohm's law.

Let us know how you make out.

Bob


Re: Setting backlash Question

Khalid Baheyeldin
 

On Thu, Aug 5, 2021 at 02:00 AM, <stefacom1@...> wrote:

It's possible when i slew manualy to compensate this baklash in hight speed automatically?

Because when i would like to change of direction frequently to adjust target, it's sometimes too long to waiting  baklash compensate, then i have "OFF" this fonction
OnStep has built in backlash compensation that does exactly what you describe: advances the motor in one direction at high speed, so you don't have to wait.

You can set the values, in arc seconds, for each axis from within the Android app (3 dot menu), the SHC, INDI or ASCOM.


Re: Adding an optical encoder to a dual shaft stepper motor, does onstep hardware/software support this?

Peter Boreland
 

Ken,

Was thinking close loop drive. Does onstep then support "Telescope Drive Master" Type functionality? i.e the ability to analyze and cancel out PE? Would need a much level res encoder though.

Peter


Re: Adding an optical encoder to a dual shaft stepper motor, does onstep hardware/software support this?

Peter Boreland
 

Sorry that should have been 10,000 counts.


Re: Steppers

adraasch
 

Jeff,

You have four wire stepper motors.  You just need to identify which colors are paired with each other.

The simplest method which does not require any meter is to separate all the ends of the wires so none are touching each other.

1. Turn the motor shaft with your fingers, noting the amount of torque required.

2. Short any two wires together.

3. Repeat step one, if the torque is greater, the wires that are shorted are a winding pair.  If not, swap one of the wires that are shorted with another color and retest the torque.

You should now have identified a pair of wires that forms one of the motor's windings.  The other remaining two wires are for the other winding.

You now have enough info to attach this to a driver.  (Don't worry about +/- identification of the wires, as this will only affect the rotational direction of the stepper motor.)

If when your entire setup is connected you determine that when the stepper motor is asked to move the scope west, it actually moves it east, reverse one of the winding connections on the stepper, or modify the config file to reverse the rotation direction in software.

Hope this helps,

Arlen



On Thu, Aug 5, 2021 at 9:35 AM <jeff@...> wrote:
I have a pretty decent multimeter. I just need to read how to measure the windings.


Re: Steppers

Jeff Nyman
 

I have a pretty decent multimeter. I just need to read how to measure the windings.


Re: Adding an optical encoder to a dual shaft stepper motor, does onstep hardware/software support this?

Ken Hunter
 

OnStep should support it but there would be no reason to put it on your stepper motor...
Better to couple it to your Driven Axis


Adding an optical encoder to a dual shaft stepper motor, does onstep hardware/software support this?

Peter Boreland
 

I found this optical encoder https://www.anaheimautomation.com/products/accessories/encoder-item.php?sID=193&pt=i&tID=112&cID=34 and was wondering if the onstep hardware/software would support it?

2 Channel quadrature TTL.

This one has 100,000 counts.

Peter


sky planetarium does not connect.. help please

asirio <asirio.x@...>
 

Hello friends, I would like someone to give me a hand, since I am about to discontinue the use of sky planetarium.
 
I created my onstep with ramps 1.4, and I connect through a ht06 bluetooth, everything works perfectly in android and stellarium, but when connecting to sky planetarium through the onstep driver, "onstep telescope" is disconnected without further ado, there is no error message or anything, this is the log:

02130223:[Ascom.Telescope] Driver info: On-Step Telescope
02130265:[Ascom.Telescope] Driver description: 4.24g
02130566:[Ascom.Telescope] Connect, Autostar compatible: (On-Step Telescope 4.24g)
02131045:[Ascom.Telescope] Can set Tracking
02131051:[Ascom.Telescope] Can find Home
02131054:[Ascom.Telescope] Can Park
02131057:[Ascom.Telescope] Can Unpark
02131060:[Ascom.Telescope] Can Set Park
02131063:[Ascom.Telescope] Can Sync
02131065:[Ascom.Telescope] Can Slew
02131068:[Ascom.Telescope] Can Pulse Guide
02131258:[Ascom.Telescope] Can Slew Async
02131261:[Ascom.Telescope] Can set Guide Rates
02131301:[Ascom.Telescope] Does refraction
02131337:[Ascom.Telescope] Can Sync. Coordinates
02131708:[Ascom.Telescope] Set latitude/longitude
02131979:[Ascom.Telescope] Set UTC offset: -02
02132369:[Ascom.Telescope] Set date/time: 04/08/2021 21:25:54 UT
02133730:[Ascom.Telescope] OnStep fast reading PEC data
02135670:[Ascom.Telescope] OnStep 160 PEC samples
02137015:[Ascom.Telescope] Disconnect



I can connect in "Device hud telescope" mode, this is the connection log:
 
00719251:[Ascom.Telescope] Driver info: DeviceHub telescope driver. Version: 6.5
00719254:[Ascom.Telescope] Driver description: Device Hub Telescope
00719484:[Ascom.Telescope] Connect, Autostar compatible: (DeviceHub telescope driver. Version: 6.5)
00719529:[Ascom.Telescope] Can set Tracking
00719542:[Ascom.Telescope] Can find Home
00719551:[Ascom.Telescope] Can Park
00719560:[Ascom.Telescope] Can Unpark
00719570:[Ascom.Telescope] Can Set Park
00719579:[Ascom.Telescope] Can Sync
00719584:[Ascom.Telescope] Can Slew
00719589:[Ascom.Telescope] Can Pulse Guide
00719591:[Ascom.Telescope] Can Slew Async
00719591:[Ascom.Telescope] Can set Guide Rates
00719767:[Ascom.Telescope] Does refraction
00719836:[Ascom.Telescope] Can Sync. Coordinates
00720237:[Ascom.Telescope] Set latitude/longitude
00720253:[Ascom.Telescope] Note, setting UTC offset isn't supported.
00720475:[Ascom.Telescope] Set date/time: 05/08/2021 3:02:15 UT
00819847:[Ascom.Telescope] Telescope control thread terminated

 
 but all the options appear deactivated, I cannot align, nor traking, nor disappear, nothing at all.
I don't know what I'm doing wrong, but it's driving me crazy. I did a new installation of win10, since I read that it could be due to corrupted files from win, nothing!
I checked the firmware for options for sky planetarium connections, but I didn't see anything.

I do not have a paid subscription, I read in a topic that the telescope connection worked completely.
 
I hope you can give me a hand, sorry for my "google translator".
Thanks and best regards.


Re: wifi page unavailable #wifi

exebece@...
 

oic thanks


Re: Setting backlash Question

stefacom1@...
 

Hello,

It's possible when i slew manualy to compensate this baklash in hight speed automatically?

Because when i would like to change of direction frequently to adjust target, it's sometimes too long to waiting  baklash compensate, then i have "OFF" this fonction ... but with summer tiem i have more time to recheck this interesting features ...

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