Date   

Re: Plug-in interface for External stepper Drivers

Robert Benward
 

To the diode question.  Yes and no.  For starters, the top diode is backwards.  The voltage will never go below 3V.  Series strings are useful if you want to keep a tight reign on the voltage and keep them within the supply rails.  You can use a single zener to ground, but the breakdowns tolerances are not that great, and they vary quite a bit over temperature.  You can use a regulator diode, such as an LM4040.  Those are tight tolerance, but also expensive.  For one input, OK, but if you had 20 or 50 or 100 inputs, your boss would probably fire you. 

The Schottky diodes are used for their low forward drop, insuring conduction not much higher than VSS (or 3.3V in this case).  The other half, the threat current x the voltage is a peak PD.  A 100mA threat x a 3.5V zener is a larger dissipation than the same current through a 0.3V forward drop.  This arrangement assumes you have a robust 3.3V supply (or whatever VCC you are using), and you can absorb the pulse current via all the other loads and the inherent capacitance on a supply line.

The thing is, they are unnecessary; every IC has these intrinsic body diodes built in to the substrate and across every input.  That is why absolute ratings, which used to be specified as max current into a pin, is now specified as VCC+0.3V or VEE-0.3V.  With sufficient impedance, and understanding the threat, the body diodes and 100K or an RC, is more than enough to protect the input. 

Still need to fix the input voltage though...

Bob


Re: Initial OnstepX download error

Chad Gray
 

I have not updated my OnStepX MiniESP3 to the latest SWS yet.  I will do that tonight.

Here is what i am running now and i have the data under "advanced".

image.png


On Fri, Jun 24, 2022 at 2:07 PM Robert Benward via groups.io <rbenward=verizon.net@groups.io> wrote:
Everything seems to be working fine, but some things are different.  In the SWS config tab, the advanced settings for axis 1&2 no longer have access to the Steps/deg, microsteps, and currents. All it shows is a "revert to default".   I tried hitting default but that did nothing. There seems  to be nothing adjust under those tabs.

I am I missing something?  I looked in the wiki but I saw no mention of this.
Bob


Re: Initial OnstepX download error

Robert Benward
 

Everything seems to be working fine, but some things are different.  In the SWS config tab, the advanced settings for axis 1&2 no longer have access to the Steps/deg, microsteps, and currents. All it shows is a "revert to default".   I tried hitting default but that did nothing. There seems  to be nothing adjust under those tabs.

I am I missing something?  I looked in the wiki but I saw no mention of this.
Bob


WeMos R32/CNC v3 LV8729 Focuser

Johnnie Pattison
 

So, I'm getting a new mount, and because I like Onstep so much, I decided to build a stand alone focuser for it. I have built 2 Onstep mounts with focusing and not had any issues. This time however...
I took the code from my CNCv3/LV8729 setup and started with new hardware. Set the code to track on startup, and left all Axis OFF except Focuser 1. Added an ESP WIFI module and everything works. The issue is that when I turn the focuser off, and back on, it resets to position 0. I have gone through the code of all 3 setups and can't figure out why it doesn't save the position between reboots. Fault WIFI module? 


MAXSTM3.6 Components #blackpill

@DeputyDawg
 

Hi to all,

I have taken the plunge last night and ordered a bunch of MaxSTM3.6 boards. When considering UK postage, it seemed pointless just ordering a couple of them. So either i will need all of them because of screwups or more likely i will have some spare if anyone in UK interested.

Bill of Materials has also been ordered - enough for one board.

However there is one component that is proving elusive for me in the UK - its the PJ325M 3.5mm audio socket. I can find them and they are accessible if i buy 5000 or if i order Qty1 for £0.15 and then pay £30 in postage...........

Just wondering if anyone in the UK has a spare PJ325M in their back pocket........??


Re: not able to verify the device

Howard Dutton
 

Probably the source code isn't installed correctly (path problem:)
Uploading the Firmware

If that doesn't do it re-install the Arduino IDE.


Re: Goto Failed in Standby

Mike Ahner
 

On Thu, Jun 23, 2022 at 07:19 PM, Joy Clarke wrote:
I allow the OnStep app to use my location to get date & time etc which works fine.
Just to be sure, you do upload the date/time into the OnStep controller? It's not automatic.
-Mike


Re: Initial OnstepX download error

Robert Benward
 

Howard,
That worked!  Status and drives OK.  Exercising the rest of the board.  

Thanks!
Bob


not able to verify the device

Suveer Udayashankara
 


Hi 
I am having a bit of problem while verifying the code..
The Arduino ide is not able verify the code
The error is :

OnStep:65:10: fatal error: src/sd_drivers/Models.h: No such file or directory
   65 | #include "src/sd_drivers/Models.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1
src/sd_drivers/Models.h: No such file or directory
But the all the path is written in the program are doing well..
But still ham getting this error..
How to tackle this issue


Re: Goto Failed in Standby

Howard Dutton
 

No other ideas really.


Goto Failed in Standby

Joy Clarke
 

Sorry I forgot to mention, if it makes any difference, that I live in New South Wales.. I allow the OnStep app to use my location to get date & time etc which works fine.

Darryl.


Re: not able to verify the device

Suveer Udayashankara
 


Hi 
I am having a bit of problem while verifying the code..
The Arduino ide is not able verify the code
The error is :

OnStep:65:10: fatal error: src/sd_drivers/Models.h: No such file or directory
   65 | #include "src/sd_drivers/Models.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1
src/sd_drivers/Models.h: No such file or directory
But the all the path is written in the program are doing well..
But still ham getting this error..
How to tackle this issue


On Fri, Jun 24, 2022, 05:31 Howard Dutton <hjd1964@...> wrote:
On Thu, Jun 23, 2022 at 04:56 PM, Joy Clarke wrote:
Any suggestions.?
Make sure the date/time are set.


Re: Goto Failed in Standby

Howard Dutton
 

On Thu, Jun 23, 2022 at 04:56 PM, Joy Clarke wrote:
Any suggestions.?
Make sure the date/time are set.


Goto Failed in Standby

Joy Clarke
 

Hi, Background: My scope is a GSO 12" Dob that I have added 2 nema23 stepper motors to the mount which run along timing belting, one for alt and one for az. I am trialling a goto system from Byers using the OnStep firmware and I connect to the system via wifi.

Tried using the "goto" command in the OnStep app and got the "Goto failed in standby" message. I followed the solution given by a Group member previously i.e. "press the [at home (reset)] button. I had the stepper motors off the belting and they worked when I selected the "goto" command. Put the motors back onto the belting and tried the "goto" again but got the "goto failed in standby" message again. So I went through the process again of "resetting" etc and even turned the whole system off and on again. Did the "reset" again but each time I tried after this I keep getting the "goto failed in standby" message and obviously the mount doesn't move. Any suggestions.?

Darryl.


Re: Initial OnstepX download error

Howard Dutton
 
Edited

On Thu, Jun 23, 2022 at 12:29 PM, Robert Benward wrote:
Disabling status worked.  I do not have jumpers on my board, MISO has dedicated pins, but I will go over the pinmap to see if here any conflicts.  If this helps, the same board has status and drives working on 4.24C.
I found the issue, probably introduced when I added TMC2209 UART support.  Patched and works here now.


Re: EQM35 Pro - replace gears with pulleys and belts #EQ5 #backlash #mount

George Cushing
 

I assume you intend to keep the existing drives?

Looks too tight to permit much modification. What the gear reduction between the RA drive and the worm?

image.png


Re: FYSETC S6 Motor Lock up

George Cushing
 

I don't think there are many sources of inexpensive NEMA 17 step motors. The red, green, blue & black color scheme seems to be universal among them.

The motor manufacturers are fairly consistent There is an A coil and a B coil. The coils are polarized so one end is "+" and the other is "-." Thus you will see this symbol which gives you most of the information you need.
image.png
Add a little color and it tells you all you need to know.

image.png
The problem arises with the driver carrier manufacturers. They can't seem to decide on a standard coding or which way is up!

image.png

Regardless of the inscriptions the hookups are all the same except the ST820. Some use the letter for the coil designation others the numeral. 

Most of the time, one of these will work.
image.png



Re: android app menu button

drathomas
 

Dave, right, might be a software problem. I'll check if there's a chance to update the OS. Maybe that helps.


Re: Initial OnstepX download error

Robert Benward
 

Howard,
Disabling status worked.  I do not have jumpers on my board, MISO has dedicated pins, but I will go over the pinmap to see if here any conflicts.  If this helps, the same board has status and drives working on 4.24C.

Bob


Re: HEQ-5 conversion with OnStepX, FYSETC E4 and Nina

Howard Dutton
 
Edited

I examined it and It has significant drawbacks.

From what I recall the stepper drivers sockets have no mode switching at all not even SPI.

It uses 3x 74HC595 SSR's (to make 24 output pins from 3 MCU pins) which X does in theory support.  I think it would work and if you use TMC2209's and jumper lead the serial interfaces could be ok.

Seems like a lot of hassle though.

1041 - 1060 of 45738