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OnStep telescope controller for SkyWatcher EQ5

ATM accessories DIY equipment 3d printing mount
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#1 Roman167

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Posted 17 June 2019 - 08:35 AM

Hello dears!

 

I'm for over 30 years a mechatronics technician and for a few years a amateur astronomer. Actually, I have been involved in astronomy since my childhood, but after a long time break, I have found my way back to this beautiful hobby.

 

I have now used my craftsmanship and specialist knowledge and have built my own OnStep GoTo controller for my SkyWatcher EQ5. I'd like gladly to report about it here in this forum.

 

I was in point of fact to build a simple tracker for my EQ5, but I quickly became aware of Howard Dutton's OnStep project in my search for a simple solution. After registering with the OnStep project group and reading the articles carefully, I decided to build myself an OnStep. Since I was looking for a simple, compact variant in my own impatience and wanted a finished GoTo controller quickly, I decided to reproduction the MiniPCB, based on the Teensy 3.2.

Here is my finished configuration for the stepper motors and the power transmission to the worm gears after some experiments:

 

NEMA 17 Bipolar Stepper 0.9deg (400 Schritte/Rev) 1,68 A 44 Ncm (62.3oz. in) Motor

GT2/2GT pulley 12 Teeth 5.0mm Bore with 6mm Width Belt for the motor shafts.
GT2/2GT pulley 48 Teeth 6.0mm Bore with 6mm Width Belt for the worm shafts on the EQ5.

 

This results in a ratio of 4:1 only for the drive. With the worm gear ratio of 144:1 results in a total ratio of 576:1. This results on 1/16 micro-steps for both axis a resolution of 10240 Steps Per Degree. The Brackets for the Nema 17 stepper motors on the EQ5 mount, I have found this on Thingiverse.com website.

 

I put a little video about the production process on Youtube.

 

https://www.youtube....h?v=bG1tTvUY7pI

 

Later I made the OnStep Smart Hand Controller with a little display. Although the OnStep is actually designed for operation with a smartphone or a tablet, I think that operation with the Smart Hand Controller is the better option.

I hope, you enjoyed my small contribution about my replica of the Onstep.

 

Thank you in advance.

Kind regards from Austria.

Roman


Edited by Roman167, 17 June 2019 - 08:36 AM.

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#2 gregj888

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Posted 17 June 2019 - 10:27 AM

Roman, looks great...  like the video...


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#3 Roman167

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Posted 17 June 2019 - 11:16 AM

Roman, looks great...  like the video...

Thank you very much! smile.gif



#4 Rickster

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Posted 17 June 2019 - 11:29 AM

Well done Roman. 

 

I also made an Onstep controller.  I based mine on a MKS Gen L 3D printer board.  I use mine for wireless remote control of a large equatorial mount and two focusers.  I can control it from an Android device or a Windows based computer.

 

Kudos to Howard and the Onstep group for making this possible.

Attached Thumbnails

  • Onstep controller MKS Gen L (Medium).jpg

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#5 Roman167

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Posted 19 June 2019 - 06:32 AM

Well done Roman. 

 

I also made an Onstep controller.  I based mine on a MKS Gen L 3D printer board.  I use mine for wireless remote control of a large equatorial mount and two focusers.  I can control it from an Android device or a Windows based computer.

 

Kudos to Howard and the Onstep group for making this possible.

Thank you very much. smile.gif

Because I was not at home on the weekend, I could not add any pictures to my post. I would like to catch up here now.

Meanwhile, I've made some changes to my on-site. That's why I replaced the ESP-01 module with an ESP-07 with an external antenna and with a self-developed PCB, it can be addressed like an ESP-01. This change was necessary because my OnStep is housed in a metal case, which greatly reduces the range of the WiFi connection.
 

In addition, I have later installed a buzzer, which I have taken over from the MaxPCB.

ONSTEP.jpg

 


Edited by Roman167, 19 June 2019 - 06:36 AM.

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