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Re: Motors not reversing with Control in Sky Planetarium

Khalid Baheyeldin
 

On Tue, Jan 18, 2022 at 06:15 AM, Gerry Byrne wrote:
The four wires coming from the motor are (left to right with the terminal facing you) 1,2,3,4 and are connected to the axis terminal in the following order (from left) 4,2,3,1. For Axis one I am using temporary connectors so that I can change them around easily but the Axis 2 wires are soldered to a proper connector for the terminal. All have been circuit tested.
Are they off the shelf 4-pin to 6-pin 4-wire 3D printer cables?
Or are they custom made by you?
If they are the off the shelf type, the probability of errors are less (though not zero).
They are real time savers over custom made cables.

And do you have anything else between the drivers and motors? Such as RJ45 breakout
boards, and/or RJ45 cables? It would help to connect the motors directly to the Axis1
and Axis2 4-pin connector until we get to the bottom of this. The less components
in the path, the easier it is to troubleshoot ...

Another thing is the motors, are they geared? Those gearboxes usually have insane
amount of backlash, and maybe they are not reversing because you are using very
low speed, and not enough time to get over the backlash.

If you use a higher speed (say 1/2 Max), maybe you will see the motor eventually
go into the reverse direction?


Re: Dobson goto with Onstep

Khalid Baheyeldin
 

On Tue, Jan 18, 2022 at 03:25 AM, <lrosellpardo@...> wrote:
After tuning backlash and leveling base seems now it's tracking fine.

These planetary gears from OMC have a terrible backlash but enough for visual.

Thanks Khalid
OnStep provides for up to 1 degree of backlash (3600 arc seconds).

Good to hear that this is all it is ...


Re: Power for extra fan

 

This should not be an issue.  Your fan may not operate with as high as an RPM as designed, but you seem to be OK with that.  As long as you are not using the E0 Diag slot with a stepper driver, taking the 5V from there should be no different than taking it from EXP1 or EXP2.


Re: Wemos D1 R32 - Need info on Arduino IDE Config

George Cushing
 

The ESP32 has an elaborate power management scheme including a brownout detector.
31.3.5 Brownout Detector
The brownout detector checks the voltage of pin VDD3P3_RTC. If the voltage drops rapidly and becomes too
low, the detector would trigger a signal to shut down some power-consuming blocks (such as LNA, PA, etc.) to
allow extra time for the digital block to save and transfer important data. The power consumption of the detector
is ultra low. It remains enabled whenever the chip is powered on, with an adjustable trigger level calibrated around
2.5V. Page 678, ESP32 Technical Reference Manual

I put together a MiniESP3 and when I first powered it I got a power LED on the ESP32, but none on the ESP8266 or the power and status LEDs. Checking the output of the MP1584 regulator, I got a solid 3.3V. Opps! Picked up the wrong regulator😨

At a few bucks it might be worth adding this better quality regulator to power the ESP32. It can be supplied by 12-20V Vcc. Pull the 1117 3.3V regulator off and connect the MP1584 OUT to the center tab pad.

Repower.jpg


Re: NINA Unpark Mount Not Working

Lloyd Simons
 

Peter,

I haven't tested extensively, but I successfully unparked from the sequencer last weekend.

Lloyd


Re: Focuser not working, FYSETC S6 v2.0 #fysetc

Chad Gray
 

I got confused trying to get my focuser working.  I found that the mount has to be tracking in order for the focuser too work.


On Tue, Jan 18, 2022 at 8:14 AM Robert Benward via groups.io <rbenward=verizon.net@groups.io> wrote:
Check the voltage on the enable pin (pin 1 on the driver) during and after a drive (we're not slewing anywhere I suspect).  Make sure it is low (~0v) during the drive.  
Bob


OnStep not working after code re-upload FIY #wemos #esp32 #8266 #maxesp3 #wemos #esp32 #arduino #d1

Mircea Radutiu
 

I have built an MaxESP3 OnStep controller. 
It works. Until...
 
At some point I updated the ESP32 from 3.16 to 4.24, but unfortunately I forgot to configure the N-S axis reversing, as needed. It happens.
I went out in the field on one of the few clear nights, happy as a daisy to test it out with some heavy weight instrument configurations.
While aligning the mount, I discovered to my surprise that I had completely forgotten to reverse the N-S axis.
No problem.
I had my laptop with me, an USB cable and a screwdriver to take apart the OnStep box.
Powered off the box, pulled the cables from it, took it apart and extracted the ESP32 module. 
Modified the code to suit my needs, compiled and uploaded into the module.
I put back the box, cabled it and powered on.
Following this, surprise no.2 of the evening - the WEMOS D1 mini 8266 comm module would not connect to the ESP32, so OnStep would not start. The blue led did not stop from blinking.
The WEMOS was sending ':GVP#' over the serial port, and the ESP32, when queried with ':GVP#' responded with 'On-Step'. But that was it.
After this, there is a very very long and tedious story, comprising of hours or checking, compiling, re-configuring the code, changing/downgrading the board versions in Arduino IDE (1.8.13) - with the same results, no connection between the ESP and the WEMOS modules.
 
What worked for me, as usual, was the last resort solution - I wrote into both modules some other, completely different sketch, with no connection whatsoever with the OnStep Project, and after that rewriting the modules with the OnStep code. FIY, for the WEMOS board the library used was 2.4.2 and for the ESP32 it was 1.0.4.
 
It did the trick.
 
Maybe it helps.
Regards.
 
P.S. Why did all this happen? No idea. If someone can shed some light, please do.


Re: Focuser not working, FYSETC S6 v2.0 #fysetc

Robert Benward
 

Check the voltage on the enable pin (pin 1 on the driver) during and after a drive (we're not slewing anywhere I suspect).  Make sure it is low (~0v) during the drive.  
Bob


Re: Focuser not working, FYSETC S6 v2.0 #fysetc

Sean
 

Ok good idea to try swapping the stepper drivers around, I'll try that.

As for the jumpers, my board came with the jumpers pre-configured for spi mode enabled.


Re: Which controller to use for next OnStep build?

Peter Boreland
 

On Mon, Jan 17, 2022 at 08:08 PM, Otto wrote:
On the volt/Amp meter, how do you diagnose if you are imbalanced?  Are you looking at balance in both the RA/Dec axis?
Otto,

The ammeter is in line with the ground between the external connector and the PCB.  Doing one axis at a time, one is looking for the current draw when slewing to be the same CW and CCW. This particular ammeter measures up to 3A. 

Peter


Re: Motors not reversing with Control in Sky Planetarium

Gerry Byrne
 

Khalid,
I've ordered replacement LV8729s from Germany, should be here in a couple of weeks.
Both axes displayed the same behaviour, even when I changed from one set of drivers to another. By changing the wiring pattern I was able to reverse the direction of motion (i.e. from anti clockwise to clockwise) but they still did not reverse when commanded. I also tried giving commands via the serial monitor without success: they continued to move in the same direction. Otherwise they moved very smoothly and ran quite cool.

One set of the LV8729s were definitely installed on a Blue Pill PCB that I once fried. I told Howard the other set were new although, on reflection, they may have been aboard a FYSETC I accidentally shorted from beneath by putting it down on a stray piece of bare wire.

The four wires coming from the motor are (left to right with the terminal facing you) 1,2,3,4 and are connected to the axis terminal in the following order (from left) 4,2,3,1. For Axis one I am using temporary connectors so that I can change them around easily but the Axis 2 wires are soldered to a proper connector for the terminal. All have been circuit tested.
Gerry

On 17/01/2022 22:31, Khalid Baheyeldin wrote:
Gerry,

Let us stay with drivers that change the voltage on the DIR pin (as they should).

How are you wiring the motors to the board?

You may have stated this already, but can't remember: do both axes exhibit
the non-reverse issue, or just one axis?


--
Copernicus


Power for extra fan

ssalb
 

Hi,

I've got OnStep running already on a Fysect S6 and I'm working on a case for it now. I have a small fan laying around and I thought I could use it for this build, but I know little about electronics in general so I'm wondering: is it OK to draw some power from one of the unused connectors in this board?
I read in the wiki that fans are not supported, but I'm guessing this means "you can't control them", and I just want it to be always on. It is a 12v 0.16A fan but I don't want it to run on full speed, so connecting it to a 12v line is not an option. I tested it with 5v on the port labeled as "E0-DIAG" and it works perfectly but, is this safe or I'll fry the board at some point? Also I've no idea whether or how this interacts with the motors (it's called E0 after all). Would the EXP1 or EXP2 ports be a better option?

 

Thanks!


Re: Focuser not working, FYSETC S6 v2.0 #fysetc

philippe.larrieux@...
 

Ok, too bad.

Regarding drivers, it shouldn't matter. If you didn't try it already, I would swap the bigtreetech to one of the working axis, try both focuser with fysetc and slew with bigtreetech, just to be sure that it works properly. I presume that you changed board jumpers for spi, right?


Re: Dobson goto with Onstep

lrosellpardo@...
 

After tuning backlash and leveling base seems now it's tracking fine.

These planetary gears from OMC have a terrible backlash but enough for visual.

Thanks Khalid


Re: Started new OnStep hardware design

Ken Hunter
 

Dave... Could you comment on whether you have dampers/flywheel weights on your steppers?
and If you do, from personal experience perhaps you can help us in improving Guy Brandenburgs
setup.


Re: USB cables

 

The MKS allows you to have both external power and USB connected at the same time BUT, you have to do it in order.  I always connect my external 24v power first, and then I connect USB.  Then the reverse when turning off…disconnect USB first, then remove external power.


Re: Controller Time Drift

Mike Ahner
 

On Mon, Jan 17, 2022 at 01:44 PM, Curly wrote:
Private joke I think ;)
I get the joke, I remember... :)


Re: Which controller to use for next OnStep build?

 

On Mon, Jan 17, 2022 at 07:01 PM, Khalid Baheyeldin wrote:
If you don't need the additional features of a Max, then the MiniPCB is a tried and tested board.
George Cushing sells them.
Thanks Khalid and to all who have responded.  I've got a message into George.  I'm thinking of the MiniPCB route.


Re: Which controller to use for next OnStep build?

 

On Mon, Jan 17, 2022 at 09:40 PM, Peter Boreland wrote:
Otto,

I just completed my build using the MaxESP3. I was able to squeeze in a 4 digital Volt/Amp meter after modifying it:), which I use to balance my axes.  In this build my drivers are external to the controller,.  I am thinking of changing out the power connectors for 2 pin aviation plugs to avoid any possibility of power disconnection to the motors.

Peter

Very nice Peter!  On the volt/Amp meter, how do you diagnose if you are imbalanced?  Are you looking at balance in both the RA/Dec axis?
Do you have a picture of the internals you can share on how you wired/connected everything?
Thanks!


Direct Drive Motors

Peter Boreland
 

These look interesting: https://motor.mtl.co.jp/dcms_media/other/%CE%BCDD_Motor_EN202006_B1.pdf

Not sure what spec one needs to build a Plane Wave style mount though?

Peter

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