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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


Duplicate Boards everywhere #wemos

astrosathya
 

Hey Everyone,
So, Many of you supported me last year during my build of the Wemos+CNCV3 OnStep build which worked well, but even back then I was reporting the issue of having to reset the board everytime I connect the USB, otherwise the OnStep Panel wan't "seeing" the board and failed to connect. Well, a friend of mine who was visiting narrowed down the issue to "Duplicate"/"Clone" Wemos Board which I had purchased. They look exactly like the original, obviously, but the CH340 chips are unmarked and no way to tell what they actually are. Obviously since this friend of mine has experience soldering SMD components, he will be getting genuine chips and resoldering. He also suspects the ESP32 mdule on the Wemos is face. 
Beware Guys, just thought you'd all wanna know.


Re: Which controller to use for next OnStep build?

Peter Boreland
 

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


Re: Started new OnStep hardware design

Robert Benward
 

David,
I didn't hear an attack, but I do hear someone who is not listening.  Khalid is just telling you what you want to design, is already existing.  Khalid is, as I am, at a loss to understand what you are trying to do, that the MaxSTM doesn't do.  You might not like how he is saying it (I did not detect an attitude, but persistence), but you need to listen to what he is saying none the less.  Khalid spends a lot of time on these boards keeping many of us amateurs builders (including me) from running off the rails.  I think you need to respect that.  When he stops talking, is when I worry.

This medium is very difficult sometimes to communicate in, you need to give others the benefit of the doubt (that's why we invented smiley faces (:_>)  ).

Bob


Re: NINA Unpark Mount Not Working

Sean
 

I haven't tried out having the sequencer unpark my mount yet, but I have noticed I can't unpark if my GPS hasn't updated the time yet.

In case I have to set date/time via app or SWS before it will unpark.

Sean


Re: Which controller to use for next OnStep build?

Khalid Baheyeldin
 

On Mon, Jan 17, 2022 at 02:17 PM, Otto wrote:
Fystec - Great all-around, but seems to be vulnerable to screw-ups and finicky about flashing the software.
Screw-ups that happened, from what I remember, is not setting the USB 5V jumper correctly while connecting 12V.

It is finnicky when flashing only if you have a chatty GPS (NEO 7M). You need to try several times, but eventually the board will come up in DFU mode.
If you use the ATGM336H GPS, there is no such issue.
Just make sure you insert the USB cable into the PC side before you power up with the Boot0 jumper set to flashing.

One downside for the FYSETC S6 is that if you want it with all the toppings, wiring can become a nightmare.
You will need a daughter perfboard, and lots of wires coming out from the S6 to that daughter board.
If you don't use things like thermometers, weather sensor, ST4 port, ...etc. this is not an issue.

Wemos R32 / CNC V3 - Seems like Ken Hunter or George Cushing has these as a package which is very convenient.  But I have seen many posts with difficulties and unpredictability with these boards.
I agree that there are many posts with issues with these boards. I think it is largely due to the very wide variability of manufacturing quality by different outfits that make them.

STM32 Blue Pill - I cannot find the STM32F303 anywhere.  The CPU is available, but I am NOT desoldering and soldering such small traces to replace the CPU like others have done.
The pandemic has made the STM32F103 module very scarce and very hard to find.
I have a spare module that you can have for $5 plus shipping ($12 to $15?), but that means it will be too expensive for what it is.

The replacement faster and more capable STM32F303CC from RobotDyn is also out of stock.

The Mini and Max  - These are my top two choices.  Teensy 4.0 is readily available on Amazon which leads me towards the MiniPCB.  The MaxSTM looks to require the STM32 CPU, though there are many versions.
If you don't need the additional features of a Max, then the MiniPCB is a tried and tested board.
George Cushing sells them.


Re: NINA Unpark Mount Not Working

Peter Boreland
 

Oh, I should mention as triggered by the sequencer.


NINA Unpark Mount Not Working

Peter Boreland
 

Does anyone else find the unpark mount option in NINA not working with Onstep?

Peter


Re: Started new OnStep hardware design

Khalid Baheyeldin
 

Guys,

There is no attack here.
This is surely not intended.

My writing style is usually terse, and to the point. Sometimes this can be viewed as
being rude. And the medium does not lend itself to nuance and such.

David,
I just wanted to make sure that you have the info you need, and that the decision
to create a board is not based on perceived lack of features, or lack of support in
the firmware. At least now I know that you know.

And of course no one needs permission to create a board or make a modification to
one.
This is open source and open hardware by definition.


Re: Slew problem

kevin
 

For my initial testing i just sent commands directly to the serial port from the serial monitor in Arduino IDE then i used TeraTerm terminal emulator next  i went to Stellarium and controlled the scope with a direct com port connection and mead lx200 driver. Stellarium didn't give me any arrows etc so then i loaded Ascom and that again just worked once i sorted out that i needed to only power the Wemos via the USB lead.


Re: Slew problem

kevin
 

It could be, i don't know a lot about Ascom, i just use it.  However the android app is  working wirelessly through bluetooth. Does the android app still work if you plug the USB in?
Is the Ascom  working over USB or bluetooth ? If you are using a laptop you may have inbuilt bluetooth you could try Ascom through bluetooth serial. On my windows 10 laptop if i "add a device" in the bluetooth section it will generate 2 serial ports in the Device manager, one of which i had going with Ascom,but i prefere wires so i didn't investigate it a lot.
Some people seem to have an issue with some Wemos boards depending on the combination of USB and external power that is used. I have found on mine that if i have external power to my Wemos and the USB plugged in then the bluetooth stops working. i still haven't got to the bottom of it but i think it is something to do with the external power selection circuitry.


Re: Slew problem

wa1vta01452
 

Kevin, I still go back to my original posting. The DEC and RA work perfectly with the Android app. That leads me to believe the issue is purely in the ascom/config.h area. I wonder how the app knows what my parameters are such as the type of mount, gear ratios, etc.  I have to find some info. on the app.


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

Sean
 

Slewing first didn't work for me.  Focus motor still not working.

Does it matter that my focuser stepper motor driver is not exactly the same?  It is a BIGTREETECH TMC2130 v3.0 spi, and my RA/DEC axis' are FYSETC TMC2130'S v1.0 that I've modified for spi.


Re: Slew problem

kevin
 

have have you been following the " Re: CNC3 RA will only drive one direction" topic?  he is having similar but different issues with Wemos D1 R32 and CNC V3 boards which may be relavent.


Re: CNC3 RA will only drive one direction

kevin
 

also read top line of this, https://reprap.org/wiki/StepStick, check the resistance values they may be different between red and green boards. also applies to different makes of other drivers. Different resistances mean different driver currents for the same measured Vref.


Re: CNC3 RA will only drive one direction

kevin
 

try it with ONLY USB power to the Wemos board, I found it doesn't need 12v if you always have USB powered like i do for my ascom driver.


Re: Motors not reversing with Control in Sky Planetarium

Khalid Baheyeldin
 

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?


Re: Which controller to use for next OnStep build?

Chris Whitener
 

I have just finished a comparison of three boards.  FYSETC S6, MaxESP32, and MiniPCB2.  I am waiting for Howard to review.

The result is that with careful settings all three boards seem to work fine for me, slewing a 65lb scope at 3degrees/second.

Personally the choices are not about slew speed.  The 3d boards are changed at whatever point the 3d community needs them.  I already have 3 different versions of the FYSETC.

Of the Howard designs, I like the ESP32 based unit(MaxESP3).  It reflashes easily and has plenty of speed.

The Teensy(4.0) based board has an internal RTC and is the runner up only because the signal to the stepper cannot be set to pulse which may mean nothing to most setups.

All the STM 


Re: CNC3 RA will only drive one direction

Jamie Flinn
 

Update
A4988 in all slots - using 4.24OnStep
Power CNC and wemos from split 12v (13.2 volts) - connected with USB
Cart du Ciel is now connected AND driving both axis BUT ONLY WHEN I HAVE A GREEN A4988 IN RA AND  RED A4988 IN DEC!!!!!!!!!
This is the THE most bizarre trouble shooting I have ever done - WHAT THE %$#$@ is the difference between red and green?
OMG my head hurts on this
BT still drops when you try to connect to it but at least I have both direction on both motors


Re: Slew problem

wa1vta01452
 

Thanks Kevin. I could try switching driver connections to t he motors to see whether the tracking is still sidereal.  I suspect it will be much slower but worth a try. 

I did what was suggested in the CNC V3 Wiki page and soldered the wires from the bottom of the CNC to the top of the ESP32. There are no jumpers under the drivers. By the way, I have done this with three different CNCs, multiple drivers used and several ESP32s with no improvement. Maybe I should just stick with the Bluetooth and the app but it bugs me that it doesn't work right with the laptop.

I will download ascom v6.6 and maybe I will find the hub. 

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