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Re: Blue Pill Upgrade: RobotDyn F303CC

Dave Schwartz
 

Yes - the RobotDyn F303 is a drop-in replacement... I've done it.

Very hard/impossible to find the complete module though. Mine were purchased from direct from RobotDyn in the initial window of availability several years ago. I hear you can turn an F103 Blue Pill into an F303 by replacing the chip, which may have better availability. I haven't done that myself.

On 2022-09-12 12:40 p.m., Ming Lei wrote:
Can I drop in the F303 blackpill dev board without any hardware modification? I did a search on RoboDyn blackpill board online and found very few hit. Is there any source available for a US buyer?


Re: Blue Pill Upgrade: RobotDyn F303CC

Ming Lei
 

I can actually answer part of my question now: F401/F411 is used on MaxSTM3.


Re: Focuser; Rotator; DIY Camera

Howard Dutton
 

...and nice job getting the software/hardware setup for this.  Perfect.


Re: Focuser; Rotator; DIY Camera

Howard Dutton
 

On Mon, Sep 12, 2022 at 11:48 PM, hitosi sato wrote:
Since OnStepX can be built with only partial features, only the focuser is used to compile and make it lighter.
In addition to WiFi/IP it is also possible to run the Website Plugin on the OnStepX ESP32 (without an SWS.)

With the website you can control the focusers and adjust the steps per micron, direction, and microstep modes (as wiring allows.)

If using TMC2209 UART (my pick) or TMC2130 SPI drivers you can also adjust the current going to the motors without having to open a case or flash again.


Re: Focuser; Rotator; DIY Camera

hitosi sato
 

Onstep and OnStepX use a config that includes devices except for the filter wheel.
Whether they all work properly depends on the choice of the arduino and the specifications of the components used, and the results will differ.
There are various technical explanations on the wiki, and I recommend reading through them all.

Hitoshi


Re: Focuser; Rotator; DIY Camera

tiagosousadias@...
 

So just to make sure, this setup allows you to have autofocus, rotator and filterwheel in one go?

This is awesome.

Would it play well with the huge backfocus distance on a dslr since probably the focuser tube would have to protrude a long way into the main tube?


Re: MaxSTM3 kit available?

Howard Dutton
 

There is no kit but it's well documented and fairly easy to assemble as these things go.

OnStepX supports it.


MaxSTM3 kit available?

Ming Lei
 

Hi,

I haven’t seen any information about where to buy the kit. Is MaxSTM3 kit available? Will it be able to run the future onStepX?

Ming


Project plan, Tak EM200

BonnyDoonMike
 

Hello All. New to Onstep but have been exploring the Wiki and messages for a couple months. So many impressive examples, and inspiring contributions. I’ll be converting an older Tak EM200 with Temma to Onstep soon - no replacement parts available. I was starting to do pretty well with Phd2 guiding, often under 1 arc-sec when one of the original steppers failed with stripped gears. Here’s my plan outline, open to your critical review:

Objectives:
- converter a mechanically good EM200 with Temma to Onstep
- astrophotography with a Stellarvue 102d f7 720mm fl, Canon 6D, ZWO120 guide camera on a 240mm fl guidescope. Total weight under 15kg.
- hope to add focus capability next year.
- I use CdC (because I could get it to work with the mount) and reasonably happy with it
- Connect Onstep to a mini Win10 computer attached to the mount, run MSRemote on my house wifi, use a Mac inside.
- The Win10 computer connects the ZWO camera and Canon 6D and SSD memory drive.
- Simple hand control is useful for setup and troubleshooting, no obvious need for more.
- Mount is semi-fixed to a pier
- fast slew speed isn’t very important but 2 to 3 degrees per sec would be great.
- Prefer ready to use board with low difficulty for software loading and configuration
- End up with a controller that includes substantially better connectors than the original Temma.
- Me: mechanically savvy, but sadly weak with software

Plan:
- two Nema17 steppers, 1.8 degree, 10:1 spur gearhead. EM200 is 180:1
- drivers probably TMC2130 or TMC5160
- leaning toward FYSETC S6, although a smaller board that could fit into the mount cavity would be nice
- 24vdc power supply
- keep the original 1:1 stepper to worm shaft spur gears
- simple hand control
- hardwired serial to Win10 computer

Questions:
- with so many board options, which are viable candidates for this conversion that align with my modest software abilities?
- while I plan to keep the stepper-worm spur gears, I could consider belt drive although it complicates things a bit.
- Other than Oriental and Stepperonline, other sources for steppers I should consider? I haven’t found many sources for Nema17s with spur gearheads that will readily fit into the housing.

Thanks in advance for your input, I’ll carefully listen to it all.

Best
--
Michael Kast
California USA
michaelkast@...


Re: Blue Pill Upgrade: RobotDyn F303CC

Ming Lei
 

I plan to buy STM32 kit from George on this website: https://www.stmbluepillkits.com/p/kits.html.

From what I read, use F303 dev board is much more preferable. Can I drop in the F303 blackpill dev board without any hardware modification? I did a search on RoboDyn blackpill board online and found very few hit. Is there any source available for a US buyer? I found there are plenty of bluepill and a new one F401/F411 dev board available on Aliexpress, has anyone discussed the possibility using F401/F411?


Re: Focuser; Rotator; DIY Camera

hitosi sato
 

Sharpcap is a little more responsive.
This is not so much a problem for me.
NINA feels a little delay for ASCOM devices.
On the other hand, the response is good for devices with native driver implementation.
In general, other software tends to be the same.
I think this is a difference in the handling of the ASCOM driver on the imaging software side.
Both authors have understood ASCOM very correctly.

Hitoshi


Re: Focuser; Rotator; DIY Camera

tiagosousadias@...
 

Do you notice any lag when using NINA's focus assistant?


Re: Focuser; Rotator; DIY Camera

hitosi sato
 

I consider it useful that OnStepX focuser allows multiple focusers to be set up on a single ASCOM driver instance.
Some people may prefer to be able to increase the number of instances of the ASCOM driver.

ESP32 also works with Bluetooth as well as wifi
I really like these wireless connections because they reduce the number of USB cables from the mount.
I like it very much.

Hitoshi


Re: Focuser; Rotator; DIY Camera

tiagosousadias@...
 

Ah nice. That I didn't know. Connecting NINA to the focuser through wifi is an awesome feature.


Re: Focuser; Rotator; DIY Camera

hitosi sato
 

I use it with NINA and Sharpcap.
This is a wifi connection instead of using a USB connection, so I connect to each software via OnStep ASCOM driver.
The auto focus method is done by overshoot.
Since OnStepX can be built with only partial features, only the focuser is used to compile and make it lighter.

Hitoshi


Re: Focuser; Rotator; DIY Camera

tiagosousadias@...
 

Did you try it theough usb to software like NINA?


Re: Source for 15mm closed GT2 belt x 1500mm/61”

Mike Ahner
 

On Mon, Sep 12, 2022 at 02:01 PM, Bill wrote:
Better options such as what?
I was referring to the pitch size GT2. That's the most commonly used size in the 3D printer world because it's one of the cheapest. However, if you look at different pitches that may be more commonly used on larger belts, you will likely find an even larger selection of gears & belts. Although you may be surprised at how strong these belts really are.

Once, we had someone mix pitch sizes and belts then had trouble with his mount not tracking accurately. The difference in pitches prevented the belts from fully engaging the teeth of the gears, with the result the overall ratio changed due to the larger new diameter of the pulley/belt mismatch. Since then, some people have warned against using any size pitch except GT2, but it's unnecessary. Just be sure to use the pulleys and belts match and all is well.

-Mike


Re: Focuser; Rotator; DIY Camera

hitosi sato
 

Hi 
I made OnStepX_wifi_focuser with this motor this summer.
I cut one part of the internal wiring of the motor to make it work with OnStepX, and it runs on a DRV8825 to focus the guider. 
I have defined two focusers and will use the other one to focus a imaging lens.
I bought them for $2.00 for two. The other metal parts are homemade on a lathe.
Electronic components are reproductions of rejected prototypes.
It is very cheaply made but it works.


Hitoshi


Re: Focuser; Rotator; DIY Camera

George Cushing
 

Hey look a Vixen Crayford! Naw, look he's still got his fingers.

4 by 50mm aluminum angle is your friend. One of the jobbers on eBay will even cut a length into 40 50mm pieces for me for under a buck a piece.

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Virus-free.www.avg.com


Re: STM32 Pcb

George Cushing
 

Got to be more specific. STm32 BluePill or MaxSTM3.

Virus-free.www.avg.com