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  #21  
Old 01-09-2020, 02:11 PM
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Originally Posted by DavidTrap View Post
..
Anyway, I've ordered the faster controller - I'm not adverse to having a spare controller as it's a long way to my usual dark sky site if something fails...
You may run into another problem: your steppers may stall due to too fast stepping.
I have 1:5 reduction before worm (belt) and I can't go faster than ~75% of STM32 capability on one mount.
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  #22  
Old 01-09-2020, 06:25 PM
sfarndell (Scott)
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Here is the Ďfinishedí board. Motors are working (tested via the white molex connection, not the RJ45 points) and so is the hand controller. I just need to print a case for the STM32 controller and add RJ45 connection terminals to the motors. Itíll be a few weeks before my scope is ready to mount these and can work out the final step counts, etc. Iíll post the complete setup then.
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  #23  
Old 01-09-2020, 10:02 PM
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Originally Posted by bojan View Post
You may run into another problem: your steppers may stall due to too fast stepping.
I have 1:5 reduction before worm (belt) and I can't go faster than ~75% of STM32 capability on one mount.
I wouldnít be surprised if youíre correct. Iím very much a beginner at electronics, but enjoy the tinkering.

DT
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  #24  
Old 10-09-2020, 01:42 PM
Ash_Chook (Ash)
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Lv8729

Hi Scott,
Looks like your getting it all together nice.
I'm not sure if you got my message on the onstep forum, but I'm looking for three LV8729's if you have any to sell?


Regards,

ash
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  #25  
Old 11-09-2020, 07:11 AM
sfarndell (Scott)
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Hi Ash

Sorry mate, but Iíve only got just enough drivers left for the last kit.

Thx
Scott
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  #26  
Old 11-09-2020, 02:52 PM
sfarndell (Scott)
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Iíve received additional feedback on the onstep forum (thanks Ash) regarding the STM32 flash mod and a 10k ohm resister is recommended rather than shorting the R3 resistor. Iíve not had trouble so far, but Iíll likely make the change this weekend.
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  #27  
Old 30-10-2020, 03:53 PM
sfarndell (Scott)
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Replacement to the STM32 blue pill

For those who are interested in the STM32 Onstep controller, or were considering it but were concerned about its speed, there is a new microcontroller to replace the STM32 bluepill, called a the Robotdyn STM32F303 and it's apparently 2x faster. It's also plug n play if you want to upgrade your existing build.

Khalid Baheyeldin just released this youtube clip explaining it in more detail and it's now on the Onstep group wiki. https://www.youtube.com/watch?v=wQCT6ukKtL0&t=447s

Cost of the new driver on aliexpress is about $15 delivered compared to about $6 for the blue pill and there are no issues with having to short pins or solder on additional resistors. Link is below.

https://www.aliexpress.com/item/3301...501e4c4de6Yuk2
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  #28  
Old 30-10-2020, 06:08 PM
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DavidTrap (David)
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Thanks for the info Scott,

I've literally just finished soldering up the MiniPCB V2 kit that finally arrived from the USA after about 6 weeks - bless USPS and covid.

About to start working out how to flash the controller and test it with some motors on the bench tonight.

DT
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